An object of 5 kg is pulled horizontally by a force of 50 N through a displacement of 10m. The work done by gravity is:
Correct answer: C. Zero
- A. 250 J
- B. 500 J
- C. Zero
- D. 5 kJ
Explanation
Since we are required to find the work done by gravity. So, W = Fdcos90o = 0 J
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Work and Energy questions
In 10 seconds, the elevator picks a weight of 1000 N over a distance of 10 m at a constant velocity. Its power is:
A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s2):
A 40 N object is released from a height of 10 m. Just before it hits the ground, its kinetic energy, in joules is: (ignoring air friction)
The average power and instantaneous power become equal if work is done at:
The power is one kilowatt if work is done at the rate of:
Kilowatt hour is the unit of: