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The turning effect of a force about a point is called:

• 1 Torque
• 2 Power
• 3 Pressure
• 4 Momentum

A force of 10 N acts at a perpendicular distance of 0.5 m from a pivot. What is the torque?

• 1 10.5 N m
• 2 5 N m
• 3 20 N m
• 4 0.05 N m

For a body to be in equilibrium, the resultant force and resultant torque must be:

• 1 Infinite
• 2 Equal to the weight
• 3 Zero
• 4 Maximum

The centre of gravity of a uniform metre rule lies at the:

• 1 25 cm mark
• 2 0 cm mark
• 3 50 cm mark
• 4 100 cm mark

Two equal and opposite parallel forces that do not act along the same line form a:

• 1 Lever
• 2 Moment arm
• 3 Couple
• 4 Resultant

A body is more stable when its centre of gravity is:

• 1 Lower and its base wide
• 2 Higher and its base narrow
• 3 Outside the body
• 4 At the top

The SI unit of torque is:

• 1 J/s
• 2 N m
• 3 kg m
• 4 N

A spanner with a longer handle makes it easier to turn a nut because the:

• 1 Torque is larger for the same force
• 2 Force is larger
• 3 Nut gets smaller
• 4 Mass is smaller

A body is in rotational equilibrium when the net:

• 1 Weight is zero
• 2 Torque is zero
• 3 Force is maximum
• 4 Speed is maximum

The centre of mass of a uniform circular disc is at its:

• 1 Centre
• 2 Outside
• 3 Edge
• 4 Surface