Torque and Angular Motion

What force does not cause any torque?

• Force perpendicular to the fulcrum, and not on the fulcrum
• Force parallel to the fulcrum, and not on the fulcrum
• Force perpendicular to the fulcrum, and slightly off center of the fulcrum
• Forces at a 45 degree angle to the fulcrum, and not on the fulcrum

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

Which of these has the greatest centripetal acceleration?

• Large Velocity, Large Radius
• Small Velocity, Small Radius
• Large Velocity, Small Radius
• Small Velocity, Large Radius

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

• m, m/s, m/s²

• θ, ω, α

• x, x/t, α

• μ, Σ, τ

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 does the bar's angular speed about the axis increase at the fastest rate?

• A
• B
• C
• D

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.

The figure shows scale drawings of four objects, each of the same mass and uniform thickness, with the mass distributed uniformly. Which one has the greatest moment of inertia when rotated about an axis through point P?

• A
• B
• C
• D

If the angular velocity of an object changes from 3 rad/s to 1 rad/s in 2 seconds, what is the object's angular acceleration?

• –1.5 rad/s²

• –1 rad/s²

• 1 rad/s²

• 1.5 rad/s²

If the translational velocity of an object is 3 m/s, and is located a distance of 2 m from the axis of rotation, what is the object's angular velocity?

• 0.67 rad/s

• 5 rad/s

• 1.5 rad/s

• 6 rad/s