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PHY1015 Tutorial Sheet 3 2020/2021
Newton's Laws of Motion
Conceptual Questions:
1. The force of gravity on a 2-kg rock is twice as large as that on a 1-kg rock.
Why then doesn't the heavier rock fall faster?
2. Why might your foot hurt if you kick a wall?
3. When you stand on the ground, how large a force does the ground exert on
you? Why doesn't this force make you rise up in the air?
4. Whiplash sometimes results from a car accident when an victim's car is
struck violently from the rear (back). Explain why the head of the victim
seems to be thrown backwards in this situation. (Assume: The seats have no
headrests).
5. Describe situations when friction is welcome to human body functions and
when it is not.
Other problems
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