Physics Dynamics

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.HS-PS2-1

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

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

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.MS-PS2-2

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

Is this object in equilibrium?

• Yes and it's moving right

• Yes and its at rest

• No, it's accelerating right

• No, it's at rest

Tags

NGSS.MS-PS2-2

Is it possible for the normal force to be equal to the gravitational force?

• Yes. If the surface is horizontal.

• Yes. If the surface is vertical

• No. FN will always be less than Fg

• No. Fg will be less than FN.

Tags

NGSS.HS-PS2-1

Is it possible for the normal force to be zero?

• Yes. If the surface is horizontal.

• Yes. If the surface is vertical

• No. FN will always be less than Fg

• No. Fg will be less than FN.

Tags

NGSS.HS-PS2-1

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

Forces cause acceleration.

• True. Every acceleration requires a force.

• True. Every force causes acceleration.

• False. Acceleration can occur when there is no net force

• False. Only net forces cause acceleration.

Tags

NGSS.MS-PS2-2

• 12 m/s

• 15 m/s

• 10 m/s

• 8 m/s

Tags

NGSS.MS-PS2-2