Moments and Centre of Mass

What is the anticlockwise moment acting on this crane?

• 80,000Nm
• 100,000Nm
• 120,000Nm
• 140,000Nm

Tags

NGSS.HS-PS2-1

The SI Unit of force is the .....

• Metre

• Centimetre

• Newton

• Pascal

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

What is the moment acting on the seesaw?

• 1.6Nm
• 15Nm
• 16N
• 4Nm

Tags

NGSS.HS-PS2-1

What is the moment produced by the 15 N?

• 15 Nm (clockwise)
• 150 Nm (anti - clockwise)
• 1.5 Nm (anti - clockwise)
• 0.15 Nm (clockwise)

A seesaw is unbalanced with two people of different masses sitting equal distances from the centre. Which of the following will result in equilibrium?

• The larger person moving further away from the centre.

• Moving the smaller person closer to the centre.

• Moving the smaller person further from the centre.

• Making the larger person do nothing.

Tags

NGSS.HS-PS2-1

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

Tags

NGSS.HS-PS2-1

Two masses of mass 10.0 kg 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 centre 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

The diagram shows a beam. Without any weights, the beam balances at its centre.

Three weights are hung as shown.

At which point does a load of 2 N balance the beam?

• A

• B

• C

• D

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.