When total work done on a particle is positive then_.
Correct answer: B. Momentum increases
- A. KE remain constant
- B. Momentum increases
- C. KE decreases
- D. All of these
Explanation
If work done is positive then kinetic energy increases. Since kinetic energy is directly proportional to the momentum therefore momentum also increases.
Last updated
About Work-Energy Theorem
The work-energy theorem states that the net work done on an object equals its change in kinetic energy. Questions involve positive and negative work, variable forces and force-displacement graphs, acceleration or deceleration, and the difference between this theorem and conservation of mechanical energy, which also requires attention to potential energy and non-conservative work.
Practise Work and Energy
748 free Work and Energy MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A 2kg object is released from rest 8m above the surface of the Earth, During the fall work done against air resistance is 60J. Just before it hits the surface its speed is: (Hint-take g=10 m/sec2)
A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes up to 2 in height further, find the magnitude of the force. Consider g = 10m/s 2
A ball of mass m is dropped from a certain height h on a sand floor. If the ball penetrates 'x' meters into the sand, the average resistive force offered by sand on the ball is:
A block of mass 10 kg is moving in x-direction with a constant speed of 10 m/s. It is subjected to a retarding force F = -0.1 J/m during its travel from x = 20 m to x = 30 m. Its final kinetic energy will be:
A bullet of mass 10 g leaves a rifle at an initial velocity of 1000 m/s and strikes earth at the same level with a velocity of 500 m/s. The work done in overcoming the resistance of air will be: