Forces and Motion Review

Explain what happens to the potential energy of the skateboarder as it rolls towards the bottom of this ramp.

• The kinetic energy decreases as the potential energy increases.

• The kinetic energy decreases as the potential energy decreases.

• The potential energy increases as the kinetic energy increases.

• The potential energy decreases as the kinetic energy increases.

As a skateboarder is going from the top of the ramp to the bottom, when will the amount of potential and kinetic energy be equal?

• 1/4 of the way down

• 1/2 of the way down

• 3/4 of the way down

• Almost at the bottom

Looking at the rollercoaster above. In which position is the kinetic and potential energy most likely to be equal.

• Position 1

• Position 2

• Position 3

• Position 4

As potential energy is transformed into kinetic energy; in what form does energy always escape the system?

• Liquid Energy

• Electric Energy

• Light energy

• Heat Energy

Which of the following force values will cause the box to move to the left?

• A = 72 N, B = 70 N

• A = 55 N, B = 55 N

• A = 60 N, B = 87 N

Martilda is driving on a straight road. At the last moment, she sees a stop sign in front of her and brings the car to a sudden stop. What will happen to the loose items in her backseat?

• The items will move to the left within her car

• The items will move to the right within her car

• The items will move forward within her car

• The items will move backward within her car

What is the best explanation for why it is harder to lift a box above your head rather than putting the same box down?

• There is wind resistance going against the box

• Gravity is pushing the box up higher as you lift it

• When you lift a box up, you are working against atmospheric pressure which pushes the box down

• When you lift a box up, you are working against gravity, which pulls the box downward

If the crate is sliding down the ramp at a constant speed, which forces are unbalanced?

• The force of gravity along the ramp (1) and the frictional force (3)

• the weight of the crate against the ramp (2) and the force of the ramp on the crate

• the force of gravity along the ramp (1) and the weight of the crate against the ramp (2)

• The crate is not accelerating in any direction, so none of the forces acting on it are unbalanced.

A student pushes a box with a certain amount of force toward the north. After some time, another student starts pushing the same box with a stronger force toward the south. What will be the new direction of the box.

• north

• south

• east

• west

According to the data table, how much force is acting on the model boat when the students measure an acceleration of 3.0 m/s^2

• 5 N

• 9 N

• 10 N

• 15 N