Lakhmir Singh and Manjit Kaur Solutions for Chapter: Force and Laws of Motion, Exercise 5: Questions Based on High Order Thinking Skills (HOTS)

A plastic ball and a clay ball of equal masses, travelling in the same direction with equal speeds, strike against a vertical wall. From which ball does the wall receive a greater amount of momentum?

A moving bicycle comes to rest after some time if we stop pedalling it. But Newton's first law of motion says that a moving body should continue to move forever unless some external force acts on it. How do you explain the bicycle case?

A man throws a ball weighing $500 \mathrm{g}$ vertically upwards with a speed of $10$ $\raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$. What will be its initial momentum?

A man throws a ball weighing $500 \mathrm{g}$ vertically upwards with a speed of $10 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$. What would be its momentum at its highest point of flight?

A car is moving on a level road. If the driver turns off the engine of the car, the car's speed decreases gradually, and ultimately it comes to a stop.
A student says that two forces act on the car, which brings it to a stop. What could these forces be? Which of these two forces contributes more to slow down and stop the car?

There are two types of forces X and Y. The forces belonging to type X can produce motion in a stationary object but cannot change the shape of the object. On the other hand, forces belonging to type Y cannot produce motion in a stationary object but can change the shape of the object. What is the general name of the forces such as X and Y?