Dynamics Physics

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 magnitude of the frictional force?

• 1.5 N

• 8 N

• 12N

• 0 N

Tags

NGSS.HS-PS2-1

What happens to the acceleration of an Atwood machine as the difference between the two masses increases?

• increases

• decreases

• does not change

Tags

NGSS.HS-PS2-1

Which of these is a correct sum statement for Fx?

• Fa - Ff = ma

• Fnet = Ff

• Fn/Fg

• Fa = ma

Tags

NGSS.HS-PS2-1

What's happening in this FBD?

• Forward acceleration

• Braking

• at rest

• constant velocity

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 accelerating upward?

• A

• B

• C

• none of these

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 moving upward but braking?

• A

• B

• C

• none of these

Tags

NGSS.HS-PS2-1

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.HS-PS2-1

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

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