S4w6 Homework - balanced and unbalanced forces

Last updated 8 months ago

30 questions

1

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S4w6 Homework - balanced and unbalanced forces

Last updated 8 months ago

30 questions

1

Draggable item		Corresponding Item

1

These vectors have not been drawn head to tail already. redraw one and draw the resultant vector for each problem

1

Newtons second law is that force = mass x acceleration. If the object isn't moving, what is its velocity? (don't worry about units)

1

Newtons second law is that force = mass x acceleration. If the object isn't moving, what is its acceleration? (don't worry about units)

1

Newtons second law is that force = mass x acceleration. If the object isn't accelerating, what is the force on the object?

1

what kind of force is the table putting on your book?

1

As your table is crumbling under the weight of the massive boulder, what can you say about the force from the table to the boulder? how is it different from the force of the table on the book?

1

watch this video.

do you have any questions

1

An object in orbit is being held in orbit by

1

If an object is moving at a constant velocity, what is its acceleration?

1

Draggable item		Corresponding Item

1

8th graders! A lot of times when we are trying to work out how fast something should be moving, it is useful to create a force diagram. watch this video on force diagrams.

1

A horse accelerating a sled to the right. Diagram all forces acting on the sled. assume there is friction, but not a lot of friction

1

A bird egg is free-falling from a nest in a tree. Diagram the forces acting on the egg.

1

A hockey puck is gliding across the ice to the left and slowing down. Diagram the forces acting on the puck as it glides.

1

Come up with a simple scenario that was not in the above video that you could create a free-body diagram for in class.

Review questions: Energy of a rollercoaster at the top of the hill at the start of the ride is

potential energy

kinetic energy

nuclear energy

spring energy

heat energy is a form of

potential energy

kinetic energy 

thermal energy

chemical energy

We've talked about a few things in physics so far. Do you remember what is and is not a vector?

inertia
potential energy
kinetic energy
velocity
speed
force
acceleration
momentum
energy
mass

Vector
scalar

Review vocabulary

Draggable item		Corresponding Item
velocity		vector showing the distance and direction you have moved.
speed		your speed and the direction of your movement
acceleration		change in displacement over time, how fast you are going
displacement		how fast your velocity is changing

These vectors have not been drawn head to tail already. redraw one and draw the resultant vector for each problem

Newtons second law is that force = mass x acceleration. If the object isn't moving, what is its velocity? (don't worry about units)

Newtons second law is that force = mass x acceleration. If the object isn't moving, what is its acceleration? (don't worry about units)

Newtons second law is that force = mass x acceleration. If the object isn't accelerating, what is the force on the object?

You put a book on a table, it is not moving. Is gravity still a force on the object?

yes

no

what kind of force is the table putting on your book?

you magically change your book into a 1000kg boulder. Youre table is not that strong, its starts to crumble. Does the velocity of your boulder change?

yes

no

As your table is crumbling under the weight of the massive boulder, what can you say about the force from the table to the boulder? how is it different from the force of the table on the book?

watch this video.

do you have any questions

in a tug of war game, if one team is pulling harder than the other, is the flag in the center moving or stationary?

moving

stationary

in the above scenario, are the forces on the rope balanced or unbalanced?

balanced

unbalanced

if the teams are pulling with the exact same force in opposite directions, the flag will be

moving

stationary

In this case the forces are

balanced

unbalanced

It bothers me that they put a satellite in orbit around the earth as an example of an object in motion staying in motion unless acted on by an unbalanced force. if an object in motion in space is not being acted on by an unbalanced force then it will

Go in circles forever

go forever in a straight line

go for a while and then stop

An object in orbit is moving

in a straight line

in a circle around another object

An object in orbit is being held in orbit by

If an object is moving at a constant velocity, what is its acceleration?

Something in orbit may be going at a constant speed, but is not going at a constant velocity. why?

because it is speeding up and slowing down, its average is the same so the speed is constant

it is not moving in a straight line, so while the speed is not changing the direction is changing, so the velocity changes

velocity is how much the speed changes, so if the speed is changing, the velocity is changing

velocity is how much the acceleration is changing, so it doesn't matter how much the speed is changing

What is a balanced force?

When only one force is on an object and makes it float

When there are no forces on an object

when all the forces on an object add up to zero and cancel each other out

when a force on an object makes it accelerate

What is an unbalanced force?

When only one force is on an object and makes it float

When there are no forces on an object

when all the forces on an object add up to zero and cancel each other out

when a force on an object makes it accelerate

One of the common misconceptions in physics is that the balanced forces that keeps an object stationary are the "equal and opposite reactions" described in Newton's third law. They are not. Whether a person is falling from a building or standing on the ground, the equal and opposite force of gravity of the earth pulling on them, is them pulling gravitationally on the earth. The equal and opposite force of the earth pushing up on the person standing on the ground is the person pushing down on the ground. Newton's 3rd law force pairs are always between the same two objects. Match the force pairs that are the equal and opposite reactions in newton's 3rd law.

Draggable item		Corresponding Item
chair is pushing up on a person		person is pulling up on the earth
horse is pulling a cart forward		person is pushing down on a chair
Earth is pulling down on a person		Ralph's face hits James fist
James punches Ralph's face with his fist		cart is pulling back on a horse

8th graders! A lot of times when we are trying to work out how fast something should be moving, it is useful to create a force diagram. watch this video on force diagrams.

A horse accelerating a sled to the right. Diagram all forces acting on the sled. assume there is friction, but not a lot of friction

A bird egg is free-falling from a nest in a tree. Diagram the forces acting on the egg.

A hockey puck is gliding across the ice to the left and slowing down. Diagram the forces acting on the puck as it glides.

Come up with a simple scenario that was not in the above video that you could create a free-body diagram for in class.

Review questions: Energy of a rollercoaster at the top of the hill at the start of the ride is

potential energy

kinetic energy

nuclear energy

spring energy

heat energy is a form of 

potential energy

kinetic energy 

thermal energy

chemical energy

We've talked about a few things in physics so far. Do you remember what is and is not a vector?

inertia

potential energy

kinetic energy

velocity

speed

force

acceleration

momentum

energy

mass

Vector

scalar

Review vocabulary

velocity

vector showing the distance and direction you have moved.

speed

your speed and the direction of your movement

acceleration

change in displacement over time, how fast you are going

displacement

how fast your velocity is changing

You put a book on a table, it is not moving. Is gravity still a force on the object?

yes

no

you magically change your book into a 1000kg boulder. Youre table is not that strong, its starts to crumble. Does the velocity of your boulder change?

yes

no

in a tug of war game, if one team is pulling harder than the other, is the flag in the center moving or stationary?

moving

stationary

in the above scenario, are the forces on the rope balanced or unbalanced?

balanced

unbalanced

if the teams are pulling with the exact same force in opposite directions, the flag will be 

moving

stationary

In this case the forces are 

balanced

unbalanced

It bothers me that they put a satellite in orbit around the earth as an example of an object in motion staying in motion unless acted on by an unbalanced force. if an object in motion in space is not being acted on by an unbalanced force then it will 

Go in circles forever

go forever in a straight line

go for a while and then stop

An object in orbit is moving 

in a straight line

in a circle around another object

Something in orbit may be going at a constant speed, but is not going at a constant velocity. why?

because it is speeding up and slowing down, its average is the same so the speed is constant

it is not moving in a straight line, so while the speed is not changing the direction is changing, so the velocity changes

velocity is how much the speed changes, so if the speed is changing, the velocity is changing

velocity is how much the acceleration is changing, so it doesn't matter how much the speed is changing

What is a balanced force?

When only one force is on an object and makes it float

When there are no forces on an object

when all the forces on an object add up to zero and cancel each other out

when a force on an object makes it accelerate

What is an unbalanced force?

When only one force is on an object and makes it float

When there are no forces on an object

when all the forces on an object add up to zero and cancel each other out

when a force on an object makes it accelerate

One of the common misconceptions in physics is that the balanced forces that keeps an object stationary are the "equal and opposite reactions" described in Newton's third law. They are not. Whether a person is falling from a building or standing on the ground, the equal and opposite force of gravity of the earth pulling on them, is them pulling gravitationally on the earth. The equal and opposite force of the earth pushing up on the person standing on the ground is the person pushing down on the ground.  Newton's 3rd law force pairs are always between the same two objects. Match the force pairs that are the equal and opposite reactions in newton's 3rd law.

chair is pushing up on a person

person is pulling up on the earth

horse is pulling a cart forward

person is pushing down on a chair

Earth is pulling down on a person

Ralph's face hits James fist

James punches Ralph's face with his fist

cart is pulling back on a horse

S4w6 Homework - balanced and unbalanced forces

S4w6 Homework - balanced and unbalanced forces

These vectors have not been drawn head to tail already. redraw one and draw the resultant vector for each problem

Newtons second law is that force = mass x acceleration. If the object isn't moving, what is its velocity? (don't worry about units)

Newtons second law is that force = mass x acceleration. If the object isn't moving, what is its acceleration? (don't worry about units)

Newtons second law is that force = mass x acceleration. If the object isn't accelerating, what is the force on the object?

what kind of force is the table putting on your book?

As your table is crumbling under the weight of the massive boulder, what can you say about the force from the table to the boulder? how is it different from the force of the table on the book?

watch this video.do you have any questions

An object in orbit is being held in orbit by

If an object is moving at a constant velocity, what is its acceleration?

8th graders! A lot of times when we are trying to work out how fast something should be moving, it is useful to create a force diagram. watch this video on force diagrams.

A horse accelerating a sled to the right. Diagram all forces acting on the sled. assume there is friction, but not a lot of friction

A bird egg is free-falling from a nest in a tree. Diagram the forces acting on the egg.

A hockey puck is gliding across the ice to the left and slowing down. Diagram the forces acting on the puck as it glides.

Come up with a simple scenario that was not in the above video that you could create a free-body diagram for in class.

Review questions: Energy of a rollercoaster at the top of the hill at the start of the ride is

heat energy is a form of

We've talked about a few things in physics so far. Do you remember what is and is not a vector?

Review vocabulary

These vectors have not been drawn head to tail already. redraw one and draw the resultant vector for each problem

Newtons second law is that force = mass x acceleration. If the object isn't moving, what is its velocity? (don't worry about units)

Newtons second law is that force = mass x acceleration. If the object isn't moving, what is its acceleration? (don't worry about units)

Newtons second law is that force = mass x acceleration. If the object isn't accelerating, what is the force on the object?

You put a book on a table, it is not moving. Is gravity still a force on the object?

what kind of force is the table putting on your book?

you magically change your book into a 1000kg boulder. Youre table is not that strong, its starts to crumble. Does the velocity of your boulder change?

As your table is crumbling under the weight of the massive boulder, what can you say about the force from the table to the boulder? how is it different from the force of the table on the book?

watch this video.do you have any questions

in a tug of war game, if one team is pulling harder than the other, is the flag in the center moving or stationary?

in the above scenario, are the forces on the rope balanced or unbalanced?

if the teams are pulling with the exact same force in opposite directions, the flag will be

In this case the forces are

It bothers me that they put a satellite in orbit around the earth as an example of an object in motion staying in motion unless acted on by an unbalanced force. if an object in motion in space is not being acted on by an unbalanced force then it will

An object in orbit is moving

An object in orbit is being held in orbit by

If an object is moving at a constant velocity, what is its acceleration?

Something in orbit may be going at a constant speed, but is not going at a constant velocity. why?

What is a balanced force?

What is an unbalanced force?

8th graders! A lot of times when we are trying to work out how fast something should be moving, it is useful to create a force diagram. watch this video on force diagrams.

A horse accelerating a sled to the right. Diagram all forces acting on the sled. assume there is friction, but not a lot of friction

A bird egg is free-falling from a nest in a tree. Diagram the forces acting on the egg.

A hockey puck is gliding across the ice to the left and slowing down. Diagram the forces acting on the puck as it glides.

Come up with a simple scenario that was not in the above video that you could create a free-body diagram for in class.

watch this video.

do you have any questions

watch this video.

do you have any questions