One Word Answers
Short Answer TypeA boy weighs 360 N on Earth.
i) What would be his approximate weight on the moon?
ii) What is the reason for your answer?A body is acted upon by a force. State two conditions under which the work done could be zero.
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.
i) Why is the mechanical advantage of a lever of the second order always greater than one?
ii) Name the type of single pulley that has a mechanical advantage greater than one.A stick partly immersed in water appears to be bent. Draw a ray diagram to show the bending of the stick. When placed in water and viewed obliquely from above.
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