Question

(a) Define S.I. unit of force. (b) Motion any two effects of force. (c) A body of mass 60kg has a momentum of 300kg m/s. Calculate it's velocity. (d) Why does a carpet beaten with a stick releases dust?

Answer 1

c) momentum=mass*velocity
∴ velocity=momentum/mass
                 =300/60 
                  =5m/s

Answer 2

1. 1 newton is defined as when a body of mass 1kg accelerates at the rate of 1m/s^2 .... then it is know as 1 newton.
2.a. force can change the shape & size of an object.
b. force can change the speed of an object.
3.p=mv
300=60v
v=5m/s
4.when a (hanging )carpet is beaten with stick carpet moves back & dust remain on its own /mean position due to law of inertia (1st law of motion ) & hence dust get separated with carpet and carpet get clean.

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