Advertisements
Advertisements
प्रश्न
Less force is needed when applied at a farther distance from the pivoted point.
विकल्प
True
False
Advertisements
उत्तर
True.
APPEARS IN
संबंधित प्रश्न
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 |
State the condition when the change in the momentum of a body depends only on the change in its velocity.
A body X of mass 5 kg is moving with velocity 20 m s-2 while another body Y of mass 20 kg is moving with velocity 5 m S-1. Compare the momentum of the two bodies.
A spanner (or wrench) has a long handle. Why?
Classify the following amongst contact and non-contact forces.
normal reaction force,
Give an example for each of the following uses of a machine:
to change the point of application of force
State whether the moment of force is a scalar or vector quantity?
The diagram shows a uniform metre rule weighing 100gf, pivoted at its centre O. Two weights 150gf and 250gf hang from the point A and B respectively of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate :
the total clockwise moment about O
State two factors on which moment of the force about a point depends.
Calculate the magnitude of the force of a couple, when the arm of the couple is 63 cm and the moment of the couple is 21 Nm.
