The moment of a force causes an object to

• move forward

• move backward

• stop moving

• turn about a fixed point

The turning effect of a force on a door is greater when it is applied at

• A point near the hinges and perpendicular to the door

• A point near the hinges and parallel to the door

• A point far away from the hinges and perpendicular to the door

• A point far away from the hinges and parallel to the door

Two equal and oppositely directed forces acting on an object will be in equilibrium

• Only if they act on the same point on the object

• If they are separated by a distance

• When they are balanced by a third force

• when their moments about the same point are equal

The diagram shows a light beam pivoted at one end. What is the effort required to lift the load?

• 50

• 67

• 100

• 200

The diagram shows a gauge which measures the amount of liquid in a tank. At which position should the pivot be placed so that the pointer moves the greatest distance as the tank is emptied?

• A

• B

• C

• D

What is the force F needed to balance the bar shown?

• 3

• 4

• 6

• 8

A force of 120 N is applied perpendicularly on a spanner at a distance of 9 cm from a nut. The torque produced by the force will be

• 12 Nm

• 10.8 Nm

• 15 Nm

• 12.59 Nm

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

The diagram shows the first step in an experiment to determine the position of the centre of mass of a thin card.

What is the next step in this experiment?

• Find the mid-point of PQ.

• Hang the card from point R.

• Measure the mass of the card.

• Measure the thickness of the card.

Diagram shows 4 objects on a flat surface.

M is the centre of mass of the objects.

Which object is about to fall over?

• A

• B

• C

• D