Question

4. You drive your car along a curving road at
constant speed.
(1) Does your kinetic energy change, why?
(11) Is the work done by the force
accelerating your car positive, negative
or zero?​

Answer 1

(i) As the velocity is changing on curving road so kinetic energy will also be changing

(ii) As the car is accelerating so force acting on the car will be positive

Explanation:

(a) It is given that car is moving with a constant speed but as the car is moving on curving road so direction of velocity is changing at every moment so velocity is changing at every moment

We know that kinetic energy of moving body is given by $KE=\frac{1}{2}mv^2$

As the velocity is changing so kinetic energy will also be changing

(B) As it is given that car is accelerating so force will be positive if car will decelerating then force will be negative and if car will be in stationary then there will be no force on the car

So in this case as car is accelerating so force will be positive  

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