S1W6 FC Newton's first two laws Honors - Gaspard Griffen | Biblioteka

Obavezno

1

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.

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

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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? use -10 m/s^2 for the acceleration due to gravity.

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When solving a quadratic equation, especially one that you can factor, you will frequently get more than one answer. In this case you would have gotten a positive and a negative answer. explain why you only gave me one.

Obavezno

1

Watch the following video on Newton's first law. do you have any questions?

Obavezno

1

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

Obavezno

1

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

Obavezno

1

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

Obavezno

1

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?

Obavezno

1

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?

1

What are the balanced forces for a car driving down the road at a constant velocity?

Obavezno

1

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

Obavezno

1

What is the difference between weight and mass?

Obavezno

1

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

True

False

1

Notice that after 10 days that velocity is pretty tiny. If a space ship is in orbit around the earth and then leaves orbit with that same velocity, they would be going about 8,000 m/s. It takes about

1

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?

No friction, because the bear is moving

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

there is no way to tell, because not enough information is given

the friction is 1/100 th the force of gravity in the opposite direction because the bear would be going 10 times faster without it.

1

A 747 jumbo jet of mass 30,000 kg experience in takeoff when the thrust for each of the four engines is 30,000 N. What acceleration does it have?

F=ma, so $30,000N= 30,000kg \cdot a , a=1$

The airplane has four engines, so each engine only has 1/4th the thrust which is 7,500 N. $7,500N =30,000 kg \cdot a, so \\a=1/4$

The airplane has four engines which each have 30,000N, so the total force on the plane is 120,000N.
$120,000N=30,000 kg \cdot a, \\a=4$

There is not enough information

1

What is the net force on the following object? Show your work by adding the vectors

net force is 0, the forces are balanced, and the object would have no acceleration

the net force is $8\hat i +3\hat j$ , and would have a pretty large acceleration going roughly east north east

the net force is $3\hat j$, the east-west forces are balanced, but the north-south parts of the forces are not.

the net force is 5\hat j

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What definition would you give for friction?

1

What are some examples of friction at work?

1

match

Stavka koja se može prevući		Odgovarajuća stavka
non-zero acceleration		resistance to change
inertia		a push or a pull
force		measure of resistance to change
mass		when all the forces on an object add up to zero
balanced forces		effect of unbalanced forces

1

What are some specific ways you can relate something we have done so far: Velocity, acceleration, vector addition, frames of reference, forces, inertia, etc to safety while driving. pick one and write a couple sentences about what you think a new driver should know about that topic when driving.

1

How do you feel about each of the following topics

What is inertia
What is the law of inertia
what is mass
the difference between mass and weight
the relationship between forces and acceleration
how there can be a force on an object when the acceleration is zero
how to use the equation F=ma to find the acceleration given a specific force

I've got this
i'm fuzzy
so confused