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प्रश्न
A spanner (or wrench) has a long handle. Why?
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उत्तर
The long handle of the spanner creates a greater turning moment. The handles' ends are used with less force.
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संबंधित प्रश्न
A nut is opened by a wrench of length 20 cm. If the least force required is 2N, find the moment of force needed to loosen the nut.
The S.I. unit of force is kgf. (kilogram-force)
Match the column
| Column A | Column B |
| (a) Camel | (1) broad and deep foundation |
| (b) Truck | (2) broad feet |
| (c) Knife | (3) six or eight tyres |
| (d) High building | (4) sharp cutting edge |
| (e) Thrust | (5) atm |
| (f) Moment of force | (6) N |
| (g) Atmospheric pressure | (7) N m |
How does the effect of force differ when it is applied on a rigid body?
A tall building has wide foundations.
What are contact forces? Give two Example
State the condition when the change in the momentum of a body depends only on the change in its velocity.
State two factor on which moment of force about a point depends.
State the effects that a force can produce. Given one example of each.
Calculate the length of arm of couple, if a force of 13 N produces a moment of couple of 14.3 Nm.
