momentum and torque

The easiest way to open a heavy door is by applying the force

• Near the hinges

• In the middle of the door

• At the edge of the door far from the hinges

• At the top of the door

What is the Unit for Torque

• Nm
• N
• W
• J

Torque is the product of a force exerted on an object times the lever arm.

• True 
• False

When an object is experiencing a net torque

• it is in dynamic equilibrium.
• it is in static equilibrium.
• it is rotating.
• it is translating.

A construction worker is worried about applying too much torque to a bolt using his wrench.  What could he do to reduce his torque on the bolt?

• Increase the length of the wrench
• Increase the force on wrench
• Reduce the length of the wrench
• Reduce the friction between the bolt and wrench

Tags

NGSS.HS-PS2-1

Find the magnitude of the torque produced by a 5.0 N force applied to a door at a perpendicular distance of 65 cm from the hinge.

• 75 Nm
• 3.25 Nm
• 6.3 Nm
• 8.75 Nm

An object in motion will have a _______ momentum than the same object at rest.

• larger

• smaller

• similar

The more massive object will have more momentum if the velocities are the same.

• True

• False

Calculate the change in momentum of a 45 kg runner who starts out at 1 m/s and speeds up to 3 m/s.

• 90 kg⋅m/s

• 45 kg⋅m/s

• 135 kg⋅m/s

• 0 kg⋅m/s