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State the principle of moments. Name one device based on it.
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State two conditions for a body, acted upon by several forces to be in equilibrium.
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State the condition when a body is in (i)   static equilibrium. (ii)  dynamic equilibrium. Give one example each of static and dynamic equilibrium.
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What do you mean by equilibrium of a body?
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Define the moment of a couple. Write its S.I unit.
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The adjacent diagram shows a heavy roller, with its axle at O, which is to be raised on a pavement XY. If there is friction between the roller and pavement, show by an arrow on the diagram the point of application and the direction of force to be applied. If pivoted at 0, now will it go up?
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A jack screw is provided with a long arm. Explain why?
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A spanner (or wrench) has a long handle. Why?
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It is easier to turn the steering wheel of a large diameter than that of a small diameter. Give reason.
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The stone of hand flour grinder is provided with a handle near its rim. Give a reason.
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Why is it easier to open a door by applying the force at the free end of it?
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What do you understand by the clockwise and anticlockwise moment of force? When is it taken positive?
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When does a body rotate? State one way to change the direction of rotation of a body. Give a suitable example to explain your answer.
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State two factors affecting the turning effect of a force.
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