AQA GCSE Physics - Moments

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

• Pivot

• Lever

• Wedge

• ramp

We use levers to help perform tasks more easily.

• True

• False

What is the anticlockwise moment acting on this crane?

• 80 000 Nm

• 100 000 Nm

• 120 000 Nm

• 140 000 Nm

What is the unit of force?

• metre

• centimetre

• newton

• kilogram

What is the moment acting on the seesaw?

• 1.6 Nm

• 15 Nm

• 16 N

• 4 Nm

What is the moment produced by the 15 N force?

• 15 Nm (clockwise)

• 150 Nm (anticlockwise)

• 1.5 Nm (anticlockwise)

• 0.15 Nm (clockwise)

A seesaw is unbalanced with two people of different masses sitting equal distances from the center. 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.

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

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 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 in equilibrium?

• 0.42 m

• 2.4 m

• 4.8 m

• 4.2 m

A spanner is used to tighten a nut. A 15 N force is applied 50 cm away from the pivot point. What is the moment applied to the spanner?

• 7.5 Nm

• 1.5 Nm

• 750 Nm

• 150 Nm