Torque and Moments

1. A _________is a simple machine with a fulcrum and a rigid bar.

• Pivot
• Lever
• Wedge

We use levers to make work easier.?

• True
• False

Tags

NGSS.MS-PS2-1

What is the anti-clockwise torque (moment)acting on this crane?

• 80,000Nm

• 100,000Nm

• 120,000Nm

• 140,000Nm

Tags

NGSS.HS-ETS1-3

What is the torque (moment )acting on the seesaw?

• 1.6Nm

• 15Nm

• 16N

• 4Nm

Two masses of mass 10.0 and 6.0 kg are hung from massless strings at the end of a light rod. The rod is virtually weightless. A pivot (fulcrum) is placed off center and the system is free to rotate. If the 6.0 kg mass is 4.0 m away from the pivot, how far away is the 10.0 kg mass if the system is not rotating?

• 0.42 m

• 2.4 m

• 4.8 m

• 4.2 m

Assuming the system is in equilibrium, calculate the missing distance d

• 3.4 m

• 2.8 m

• 4.4 m

• 1.6 m

Tags

NGSS.HS-PS2-1

A nut can be loosened more easily with

• a short spanner because a larger turning effect can be produced.

• a long spanner because a larger turning effect can be produced.

• a long spanner because a larger force can be produced.

• a short spanner because a larger force can be produced.

The figure shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.

Which pivot positions allows the man to lift the stone with as small a Force as possible?

• A

• B

• C

• D

Tags

NGSS.HS-PS2-1

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

• 450 N

• 350 N

• 4.5 N

• 200 N

Tags

NGSS.MS-PS2-2

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