Question

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what is the condition for a force to do work on a body
is energy a vector quantity Zrcalar
% What are the units of (a) work, and (b) energy
? & foule, Joule
What is the work done against gravity when a body is moved horizontally
By how much will the kinetic energy of a body increase if its speed is doub
10. Write an expression for the kinetic energy of a body of mass m moving wit
11. If the speed of a body is halved, what will be the change in its kinetic ener
12. On what factors does the kinetic energy of a body depend ? mam Squu
13. Which would have a greater effect on the kinetic energy of an object : do
velocity?
A How fast should a man of 50 kg run so that his kinetic energy be 625 )?
18 State whether the following objects possess kinetic energy potential energ
(a) A man climbing a hill K'E, PE
(a) A flying aeroplane KE PE
(c) A bird running on the groundKE
(d) A ceiling fan in the off position PE
( A stretched spring lying on the ground. PE
16) Two bodies A and B of equal masses are kept at heights of h and 2h res
their potential energies ?
IA. What is the kinetic energy of a body of mass 1 kg moving with a speed
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Answer 1

Answer:

The necessary condition for force to do work is that the applied force should produce motion in the body in any direction except the direction perpendicular to the force applied.