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?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.
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.
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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