S1W6 Newton's first two laws

Last updated 8 months ago

18 questions

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S1W6 Newton's first two laws

Last updated 8 months ago

18 questions

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Some people (such as me) will state newton's first law as a "unbalanced" external force rather than a "net" force. What does unbalanced mean here?

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Read in your physics book the following 56-62, the sections on Newton's first law, mass, and newtons second law of motion. the first two sections should re-ieterate the last video. Focus on the section on the second law. do you have any questions?

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If an object has no acceleration, does that mean there are no forces on the object? explain why or why not?

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What is the difference between weight and mass?

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This is a position vs time graph. is the man walking faster or slower in the green section compared to the red section?

Green is faster

red is faster

they are the same speed.

what is the farthest distance the walker gets from his starting point?

3

4

5

6

A clown is throwing a ball up and down on a railroad platform moving through town. Which of the following is the difference between the frame of reference of someone on the car, vs someone on the ground?

From the ground, the ball is moving straight up and down, from the railroad car, the motion looks like an arc through the air.

From the railroad car, the ball is moving straight up and down, from the ground, the motion looks like an arc through the air.

because the motion of the car is not accelerating, the two perspectives are the same

Plug and chug time. You are on earth and you toss a ball up in the air with the initial velocity of 4 m/s. The ball starts 1 meter from the ground. How long does it take to hit the ground. given the following equation, what do you know?

which of the following acceleration graph matches the above velocity graph?

Option 1

Option 2

Option 3

Option 4

Which of these is the best definition of inertia?

How hard something is to rotate

the tendency to resist a change in velocity

A force that acts on all matter

the reason there is a pause before something starts falling

Mass is simply a measurement of inertia. What is the definition of mass?

How heavy something is

how much something resists acceleration

how much space something takes up

the quantity of molecules making up an object

Which of the following is a good example of Newton's first law of motion?

a rocket launching into space

a ball rolling down a hill

a car accelerating along a straight road

a book resting on a table

Some people (such as me) will state newton's first law as a "unbalanced" external force rather than a "net" force. What does unbalanced mean here?

Read in your physics book the following 56-62, the sections on Newton's first law, mass, and newtons second law of motion. the first two sections should re-ieterate the last video. Focus on the section on the second law. do you have any questions?

If an object has no acceleration, does that mean there are no forces on the object? explain why or why not?

What is the difference between weight and mass?

true/false - and object with mass can have no weight

True

False

1/100000 m/s^2

1/100000 Nm/kgs^2

100000 kg/n

100000m/s^2

assume a rocket had a constant acceleration of 0.01m/s^2, Using v=at, what is the velocity of that rockets after 10 days?

v=(0.01)(10)=0.1 m/s

v=(0.01)(10)(24)(60)(60) = 8,640 m/s

v=(0.01)(10)(9.8)(60)(60)=3,528 m/s

v=(0.01)(10)=0.1 m/day

A 400 kg bear is grasping a vertical tree slides down at a constant velocity. What is the friction force that acts on the bear?

the force of gravity on the bear is $400kg \cdot -10m/s^2$, we know the friction force = +4000 kgm/s^2 because the sum of forces has to be zero since there is no acceleration

This is a position vs time graph. is the man walking faster or slower in the green section compared to the red section?

Green is faster

red is faster

they are the same speed.

what is the farthest distance the walker gets from his starting point?

3

4

5

6

A clown is throwing a ball up and down on a railroad platform moving through town. Which of the following is the difference between the frame of reference of someone on the car, vs someone on the ground?

From the ground, the ball is moving straight up and down, from the railroad car, the motion looks like an arc through the air.

From the railroad car, the ball is moving straight up and down, from the ground, the motion looks like an arc through the air.

because the motion of the car is not accelerating, the two perspectives are the same

Plug and chug time. You are on earth and you toss a ball up in the air with the initial velocity of 4 m/s. The ball starts 1 meter from the ground. How long does it take to hit the ground. given the following equation, what do you know?

1 m

4 m/s

-9.8 m/s^2

9.8 m/s^2

5 seconds

3 m

0 m

Variable we are looking for

a

v0

x0

time when it hits

position when it hits

which of the following acceleration graph matches the above velocity graph?

Option 1

Option 2

Option 3

Option 4

Which of these is the best definition of inertia?

How hard something is to rotate

the tendency to resist a change in velocity

A force that acts on all matter

the reason there is a pause before something starts falling

Mass is simply a measurement of inertia. What is the definition of mass?

How heavy something is

how much something resists acceleration

how much space something takes up

the quantity of molecules making up an object

Which of the following is a good example of Newton's first law of motion?

a rocket launching into space

a ball rolling down a hill

a car accelerating along a straight road

a book resting on a table

true/false - and object with mass can have no weight

True

False

1/100000 m/s^2

1/100000 Nm/kgs^2

100000 kg/n

100000m/s^2

assume a rocket had a constant acceleration of 0.01m/s^2, Using v=at, what is the velocity of that rockets after 10 days?

v=(0.01)(10)=0.1 m/s

v=(0.01)(10)(24)(60)(60) = 8,640 m/s

v=(0.01)(10)(9.8)(60)(60)=3,528 m/s

v=(0.01)(10)=0.1 m/day

A 400 kg bear is grasping a vertical tree slides down at a constant velocity. What is the friction force that acts on the bear?

the force of gravity on the bear is $400kg \cdot -10m/s^2$, we know the friction force = +4000 kgm/s^2 because the sum of forces has to be zero since there is no acceleration