Heena Sharma, Shubhankat Vats and, Rashmi Gupta Solutions for Chapter: Force and Laws of Motion, Exercise 4: CHAPTER EXERCISE

Velocity-time graph of a $50 \mathrm{g}$ marble rolling on floor is given below. Find positive force acting on the marble.

Explain, why is it difficult to walk on sand?

Why is the recoil of a heavy gun, on firing, not so strong as that of a light gun using the same cartridge?

A constant force acts on an object of $5 \mathrm{k}\mathrm{g}$ for a period of $2 \mathrm{s}$. It increases the velocity of an object from $3 \mathrm{m} {\mathrm{s}}^{-1}$ to $7 \mathrm{m} {\mathrm{s}}^{-1}$. Find the magnitude of the applied force.
Now, if the force was applied for a period of $5 \mathrm{s}$, then what would be the final velocity of the object?

A large truck and a car, both moving with a velocity of magnitude $u$, have a head-on collision and both of them come to a halt after that. If the collision lasts for $1 \mathrm{s}$. Which vehicle experiences the greater force of impact?

A large truck and a car, both moving with a velocity of magnitude $u$, have a head-on collision and both of them come to a halt after that. If the collision lasts for $1 \mathrm{s}$. Which vehicle experiences a greater change in momentum?

A large truck and a car, both moving with a velocity of magnitude $u$, have a head-on collision and both of them come to a halt after that. If the collision lasts for $1 \mathrm{s}$. Which vehicle experiences a greater acceleration?

A large truck and a car, both moving with a velocity of magnitude $u$, have a head-on collision and both of them come to a halt after that. If the collision lasts for $1 \mathrm{s}$. Why is the car likely to suffer more damage than the truck?