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DIRECTIONS : Each question contains Statement-1 and Statement-2. Choose the correct answer(ONLY ONE option is correct ) from the following.
Statement -1 :Mechanical energy is the sum of macroscopic kinetic & potential energies.
Statement – 2 :Mechanical energy is that part of total energy which always remain conserved.
(d)Statement -1 is true, Statement-2 is false
DIRECTIONS : Each question contains Statement-1 and Statement-2. Choose the correct answer(ONLY ONE option is correct ) from the following.
Statement -1 : An object of mass m is initially at rest. A constant force F acts on it. Then the velocity gained by the object during a fixed displacement is proportional to 1/√m.
Statement -2 : For a given force and displacement velocity is always inversely proportional to root of mass.
(c)Statement -1 is true, Statement-2 is true; Statement -2 is not a correct explanation for Statement-1
DIRECTIONS : Each question contains Statement-1 and Statement-2. Choose the correct answer(ONLY ONE option is correct ) from the following.
Statement -1 :A work done by friction is always negative.
Statement -2 : If frictional force acts on a body its K.E.may decrease.
(a)Statement -1 is false, Statement-2 is true
When frictional force is opposite to velocity, kinetic energy will decrease.
DIRECTIONS : Each question contains Statement-1 and Statement-2. Choose the correct answer(ONLY ONE option is correct ) from the following.
Statement -1 : If collision occurs between two elastic bodies their kinetic energy decreases during the time of collision.
Statement -2 : During collision inter molecular space decreases and hence elastic potential energy increases
(b)Statement -1 is true, Statement-2 is true;Statement -2 is a correct explanation for Statement-1