Which of the following is not an example of work?AMike carrying his backpack up the stairsBTom pushing a box 10 metersCAnna throwing a ball to SueDboth a and b
Question
Which of the following is not an example of work?
- A. Mike carrying his backpack up the stairs
- B. Tom pushing a box 10 meters
- C. Anna throwing a ball to Sue
- D. both a and b
Solution
The correct answer is C. Anna throwing a ball to Sue.
Here's why:
Work, in terms of physics, is defined as a force causing an object to move in the direction of the force.
A. Mike carrying his backpack up the stairs is work because he is exerting a force (carrying the backpack) and moving in the direction of the force (up the stairs).
B. Tom pushing a box 10 meters is also work because he is exerting a force (pushing the box) and the box is moving in the direction of the force (10 meters).
C. Anna throwing a ball to Sue is not work because once the ball leaves
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