Conservative forces are the only forces that can do work. The kinetic energy of

Question

Conservative forces are the only forces that can do work. The kinetic energy of a particle does not change if it is under the effect of conservative forces only. The terminal speed depends on the surface area of the skydivers. The frictional force exerted by the road on the tires of a car that is just starting to move, does not enable the acceleration needed for the car to start moving forward. During braking, the road exerts a friction on the tires to decelerate the car. Without air resistance, an object dropped from a plane flying at constant speed in a straight line will have a zero horizontal acceleration because it follows a projectile motion.

Explanation / Answer

7] False, non conservative (friction) can also do work

8]False, KE still can change, take gravitational force for example

9]True, the more is surface area, the more is drag force, and it reaches terminal speed quickly.

10] False, friction resist to an extent only, after that it moves

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