ICSE physics
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A boy weighs 360 N on Earth.
i) What would be his approximate weight on the moon?
ii) What is the reason for your answer?
i) Weight of the body on the moon is one-sixth of the weight of the body on the earth.
Weight of the body = 1/6 x Weight of moon = 1/6 x 360 = 60 N
ii) W = mg
And, acceleration due to gravity on moon as one-sixth that on the earth. Therefore, weight on the moon is also one-sixth of the earth.
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A body is acted upon by a force. State two conditions under which the work done could be zero.
The two conditions are:
i) Displacement is zero.
ii) Angle between force and displacement is 90o.
A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure:
i) Define the term momentum.
ii) How is force related to the momentum of a body?
iii) State the condition when the change in momentum of a body depends only on the change in its velocity.
i) Momentum is defined as the product of mass and velocity of a body.
ii) Force = Rate of change in momentum
iii) When velocity of the body is much smaller than the velocity of light, then the mass is constant.
A body of mass 50 kg has a momentum 3000 kg m/s. Calculate:
i) the kinetic energy of the body.
ii) the velocity of the body.
Given,
Mass, m = 50 kg
Momentum, p = 3000 kg m/s
P = m × v
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Mock Test Series
Mock Test Series