In which of the following is a force of friction necessary?
Correct answer: B. When a car is accelerating
- A. When a ball is bouncing off a wall
- B. When a car is accelerating
- C. When a drum skin is vibrating
- D. When a rocket is taking off
Explanation
Due to Newton's third law, friction force between the tyres and the road, exerts an equal and opposite force on the car. This provides the car the necessary force to propel it forward which causes the acceleration.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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