A body of mass m moves at constant angular speed ω in a horizontal circle of radius r. What is the work done on the body in one revolution?
Correct answer: A. Zero
- A. Zero
- B. 2 π mr2 ω2
- C. π mr3 ω2
- D. mr2 ω2
Explanation
In this question, the key concept is understanding that in circular motion with constant angular speed, the work done is zero. This is because the force acting on the body is perpendicular to the displacement, resulting in no work being done. Therefore, the correct answer is option A, which states that the work done is zero. The other options provide incorrect formulas that do not apply to this specific scenario of circular motion.
Last updated
About Force and Motion
Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
Practise Force and Motion
1,416 free Force and Motion 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
(1, 1, 1) . (2, 2, 2)
1st law of motion gives the definition of:
2nd law of motion measures which quantity?
7.0 kg bowling ball experience a net force of 5.0N. What will be its acceleration?
A 0.2 kg rubber ball is dropped from the window of a building. It strikes the sidewalk below at 30m/s and rebounds up at 20m/s. The impulse on the ball during the collision is: