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Chapter 7: Q27Q (page 170)

If only an external force can change the momentum of the centre of mass of an object, how can the internal force of the engine accelerate a car?

Short Answer

Expert verified

Newton鈥檚 third law helps the internal force of the engine to accelerate a car.

Step by step solution

01

Significance of Newton’s third law

According to Newton鈥檚 third law, if a body applies force on an object, the object will also exert a reaction force of identical magnitude on the body.

02

Understanding the acceleration of a car

When an engine applies force on the wheel of the automobile, it starts rotating. The rotating wheel pushes the surface of the road backward. A reaction force exerts on the wheel, pushing it forward due to the third law. This way, the car starts to accelerate using the mechanical energy produced by the chemical energy of the fuel.

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Most popular questions from this chapter

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FIGURE 7-36

Problem 46. (Ball A after the Collison is not shown)

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