A ball of 0.3 kg is thrown straight up. It rises 4.5 m, stops for a moment and falls back to the…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A ball of is thrown straight up. It rises , stops for a moment and falls back to the hand. () Find the work done by gravity
- while it rises;
- while it falls;
- over the whole trip.
Need a reminder? The key ideaShow
Work when an object moves a distance along a steady force ; . The work is positive when the force is along the motion, negative when it is against it, and zero when it is at right angles or nothing moves.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The weight. , down.
Step 2. (a) Rising, against the weight: .
Step 3. (b) Falling, along the weight: .
Step 4. (c) .
Answer: , , .
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