AP Physics

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator accelerating upward?

• A

• B

• C

• none of these

Tags

NGSS.MS-PS2-2

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator at rest?

• A

• B

• C

• none of these

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator moving upward but braking?

• A

• B

• C

• none of these

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Here are 3 FBD diagrams for an elevator. Consider them to be A, B, C. Which one shows an elevator moving at a constant rate of 2.5 m/s?

• A

• B

• C

• none of these

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

The box on the incline is at rest due to friction. Which of these calculations would allow you to get the frictional force?

• mg cos theta

• mg sin theta

• normal force

• mg

Tags

NGSS.MS-PS2-2

If you were trying to quickly determine the static coefficient of friction, you'd raise the plank until the block just starts to slide and do what?

• tan theta = mu

• cos theta = mu

• sin theta = mu

• none of these is correct

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Calculate the normal force for this situation if the angle is 30 degrees and the mass of the box is 1.5 kg.

• .75 N

• 7.5 N

• 13.0 N

• none of these is correct

Tags

NGSS.MS-PS2-2

Calculate the force down the plane, assuming no frictional force for this situation if the angle is 45 degrees and the mass of the box is 2.5 kg.

• 12.5 N

• 25 N

• 36.0 N

• none of these is correct

Is it possible for the object in the diagram to be moving to the right and have this FBD?

• Yes. It's possible that the x forces were just left off the diagram.

• Yes. It could be moving at a constant velocity.

• No. The FBD shows that the system is in equilibrium.

• No. An FBD shows all F.

Tags

NGSS.HS-PS2-1

A force of 8 Newton’s is applied to a crate so that it moves at a constant velocity of 1.5 m/s. What is the net force?

• 1.5 N

• 8 N

• 12N

• 0 N

Tags

NGSS.MS-PS2-2