Simple physics conceptual questions on forces and newtons laws, I would really a

Question

Simple physics conceptual questions on forces and newtons laws, I would really appreciate it if there were an explanation for why the answer is correct! To operate effectively, the gas ejected from a rocket must push against the air behind the rocket, thus driving the rocket forward. a. true 7. b. false 8. If you install tires on your car which are half as wide as your present tires, your stopping distance would be (compared to the case with the wide tires) about a. half b. twice c. Same This is true , because the NUMBER of atomic contacts with the road would a. increase 9· b. decrease c. stay same 10. but the TOTAL AREA of all of these contacts would b. decrease a. increase c. stay same 11. If you made your car twice as heavy as it is now, stopping distance of you car will be (compared o the lighter car) about a. half b. twice c. same

Explanation / Answer

7. (a) for forward movement at no force system gas must puchega against.

8. (b) for half area friction is half so distance is twice.

9. (b) half area so less contact s

10.(b) decrease

11.(a) half as normal force is double so friction is double and hence stopping distance will be half.

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