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In: Physics

This all counts as 1 question in class because it's supposed to be already known. So...

This all counts as 1 question in class because it's supposed to be already known. So please answer all of them. I just want to be sure I'm right.

Question 1

Which of the following statements are true regarding momentum? Check all that apply.

The total momentum of an isolated system is conserved, but internal forces can change the total momentum of the system

pinitial = (m1v1)i + (m2v2)i + (m3v3)i + …

pfinal = (m1v1)f + (m2v2)f + (m3v3)f + …
The x and y components of momentum are independently conserved
Total momentum is conserved, but angular momentum is not.
A figure skater spins faster when she draws in her arms because torque is conserved.
Momentum points in the same direction as the applied force
Angular momentum points in the same direction as the net applied torque
Momentum points in the same direction as the velocity of the object

Question 2

A bug and the windshield of a moving car collide. Indicate which of the following statements are TRUE. (Select all that apply)

The impulse on the bug and the car are the same magnitude
The impact force on the bug and the car are the same magnitude
The change in velocity of the bug and the car are the same
The change in momentum of the bug and the car are the same magnitude
None of the above

Question 3

A running thief is being chased by the police, and he jumps on a stationary skateboard hoping he will be able to go faster. That is a good idea because:

Momentum is conserved, and thus his velocity will increase when he jumps on the skateboard (which has a smaller mass).
Angular momentum is conserved, so that the wheels on the skateboard can spin much faster than his feet can run on the ground.
Momentum is conserved, and since his mass combined with the skateboard is larger, he can go faster.
Momentum is conserved, which means he will go a little slower on the skate, but will look cooler as he does so.

Question 4

Which of these are forms of energy? Check all that apply:

Kinetic Energy
Gravitational Potential Energy
Spring Potential Energy
Friction Energy
Thermal Energy
Inertial Energy
None of the above

Question 5

Bob pushes a 1-meter wide bookcase with a force of 100 N for 10 seconds, but the bookcase does not move due to friction. How much work has Bob done?

100 Nm
1000 Nm
10 Nm
None of the above

Question 6

Which of the following are units of Work?

kg / s2
N m
Joules
Calories
Degrees

(kg m / s)2 / kg
None of the above

Question 7

If an object has kinetic energy, then it also must have... (check all that apply)

Speed
Impulse
Acceleration
Force
None of the above

Question 8

When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy is:

Less
The same
Twice as much
Four times as much
None of the above

Question 9

Which of the following statements are true? Check all that apply:

Work is the what you get when a force acts over a certain distance. Therefore, without distance or force there would be no work.
Work and Distance are related because force is acted over a long distance.
Without work you do not have force.
Energy is the ability to do work or make work, and work is not done without it.
Energy causes a change, and work is needed for energy to exist.
Energy is the ability to do work or cause a change, and work is the transfer of energy.
Kinetic energy is the energy of motion, and potential energy is stored energy.
Potential energy is the energy of weight, and kinetic energy is the energy of nuclear atoms.
None of the above

Solutions

Expert Solution

genius_generous answered 1 year ago
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