4. Complete Activity 10.4 (Page 115).
• Lift an object up. Work is done by the force exerted by you on the object. The object moves upwards. The force you exerted is in the direction of displacement. However, there is the force of gravity acting on the object.
• Which one of these forces is doing positive work?
• Which one is doing negative work?
• Give reasons.
Answer:
The force exerted by you on the object is doing positive work. This is because it is in the direction of displacement. The force acts upwards and displacement is also in the upward direction. The force of gravity is doing negative work. This is because it is opposite to the direction of displacement. The force of gravity acts downwards and displacement is in upward direction.
Solved.
Related Links:
Solution to Activity 10.1
Solution to Activity 10.2
Solution to Activity 10.3
Solution to Activity 10.4
Solution to Activity 10.5
Solution to Activity 10.6
Solution to Activity 10.7
Solution to Activity 10.8
Solution to Activity 10.9
Solution to Activity 10.10
Solution to Activity 10.11
Solution to Activity 10.12
Solution to Activity 10.13
Solution to Activity 10.14
Solution to Activity 10.15
Solution to Activity 10.16
Solution to Activity 10.17
Solutions to Chapter 10 Work and Energy
