In which of the following cases does the force do no work?
Correct answer: D. Carrying a box to a different room
- A. Lifting a box from the ground
- B. Pushing a box
- C. Pulling a box using a string
- D. Carrying a box to a different room
Explanation
Work is defined as the component of the force parallel to the displacement multiplied by the magnitude of the displacement. In the scenario of carrying a box horizontally across a room, the force exerted is vertical, while the displacement is horizontal. Since there is no force component in the direction of displacement, no work is done in this case. Conversely, in the other scenarios (lifting, pushing, and pulling), the force applied has a component in the direction of displacement, resulting in work being done.
Last updated
Related questions
48 competitors entered the men's 100 metres freestyle event at this year's Muscan Swimming Championships. They were divided randomly into 6 heats, with the fastest 16 qualifying for the semi-finals.These are the results of the 6 heats.From which heat was there only one qualifier for the semi-finals?
A ballet dancer of mass 80 kg and a wingspan of 1m is executing a spin. She then folds her arms and brings them to within 20cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?
A ballet dancer of mass 80 kg and a wingspan of 80cm is executing a spin. She then folds her arms and brings them to within 20 cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?
A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?
A bar magnet and a solenoid are kept beside each other. In which of the following cases current will not be produced?