Force and Motion Concepts

Consider the leftmost diagram here. The elevator starts from rest with the free body diagram as shown. Select the possible outcome(s) below.

• It will move at a constant speed in a straight line.

• It will accelerate upwards.

• It will remain stationary.

• It will accelerate downwards.

Tags

NGSS.HS-PS2-1

Consider the rightmost diagram here. In which the elevator’s free body diagram is shown. Select the possible outcome(s) below.

• It will move at a constant speed in a straight line.

• It will accelerate upwards.

• It will remain stationary.

• It will accelerate downwards.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Consider the central diagram here. The elevator starts from rest with the free body diagram as shown. Select the possible outcome(s) below.

• It will move at a constant speed in a straight line.

• It will accelerate upwards.

• It will remain stationary.

• It will accelerate downwards.

Tags

NGSS.HS-PS2-1

Consider Problem 3.12 in Etkina’s text. In it, we are asked to consider a pie tin floating towards the ground under the action of gravity and air resistance. What is wrong with the attached diagram?

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A ball is thrown vertically upwards. After the ball is released and it is moving upwards towards its peak, it slows down. During this time...

• there are no forces whatsoever acting on the ball.

• the forces acting on the ball are balanced.

• the ball is experiencing an unbalanced force; it is directed upwards.

• the ball is experiencing an unbalanced force; it is directed downward.

Tags

NGSS.HS-PS2-1

If you were in a spaceship and fired a cannonall into frictionless space, the amount of force needed to keep the cannonball i motion would be...

• equal to the force with which it was fired.

• more than the force with which it was fired.

• less than the force with which it was fired, but not zero.

• zero, since no force is necessary to keep an object moving.

• equal to the weight of the cannon.

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

Mr. S guides a golf ball around the outside rim of the green at the Hole-In-One Putt-Putt Golf Course. When the ball leaves the rim, which path (J, K, or I) will the golf ball follow?

• J

• K

• L

Tags

NGSS.HS-PS2-1

The forces acting on an object are NOT BALANCED. Therefore, one can be absolutely certain that the object.... (Include all that apply)

• is at rest.

• has an acceleration of 0 m/s/s.

• is moving and moving in a straight line.

• is not accelerating.

• is accelerating.

Tags

NGSS.HS-PS2-1

Which objects could be moving to the right at a constant speed? (Include all that apply)

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2