AP Physics Torque v2

Does a bridge anchored resting on two pillars have any torque?

• No, it isn't moving
• Yes, but it is at equilibrium
• Yes, but it will soon break because of the torque
• No, Bridges can't have torque

The rotational equivalent to d (distance), v (velocity) and a (acceleration) are?

• m, m/s, m/s²
• θ, ω, α
• x, x/t, alphaα
• μ, Σ, τ

The center of mass is:

• the exact middle
• the heaviest part
• the point at which you can balance with one finger
• the idea that mass is concentrated throughout

How do you get the maximum torque?

• longer lever arm and less force at an acute angle
• shorter lever arm and less force perpendicularly
• shorter lever arm and more force perpendicularly
• longer lever arm and more force perpendicularly

A solid metal bar is at rest on a horizontal frictionless surface. It is free to rotate about a vertical axis at the left end. The figures show forces of different magnitudes that are exerted on the bar at different locations. In which case is the torque the greatest?

• A

• B

• C

• D

In the diagram above, two masses, one with mass m, the other with mass M = 2m are resting on a uniform plank of length L that pivots at its midpoint. If the mass m is at the far end of the plank, how far away from the pivot should the mass M be to balance the plank in a horizontal position shown?

• L/2
• L/3
• L/4
• L/6

Tags

NGSS.MS-PS2-4

When a rigid object rotates about a fixed axis, what is true about all the points in the object? 

• They all have the same tangential acceleration.
• They all have the same angular speed.
• They all have the same tangential speed.
• They all have the same radial acceleration.

A flywheel starts from rest, and has an angular acceleration of 4 rad/s². What will be its angular speed when it has made one revolution? 

• 5.01 rad/s
• 50.27 rad/s
• 2.83 rad/s
• 7.09 rad/s

• Clockwise and speeding up

• Counterclockwise and speeding up

• Clockwise and Slowing down

• Counterclockwise and slowing down

• - 8 rad/s²
• + 8 rad/s²
• -100 rad/s²
• -20 rad/s²