Sunil Batra Solutions for Chapter: Force and Laws of Motion, Exercise 3: Summative Assessment Some Solved CBSE Sample Questions

Name the physical quantity which is determined by the rate of change of linear momentum. (Work/ Force)

Name the force that is responsible for change in position or state of an object.

(Choose from the following: Unbalanced force/ Balanced force)

Name the principle on which a rocket works.
(Conservation of energy/Conservation of momentum)

A body of mass $\text{'}m\text{'}$ is moving with velocity $\text{'}u\text{'}$. When a force is applied on it for time $\text{'}t\text{'}$ its velocity increases to $\text{'}v\text{'}$. Write expressions for rate of change of momentum. Also write its SI unit.

Total momentum of two bodies remains unchanged before and after the collision. Justify this statement.

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

During arm wrestling, participants put their arms on the table, and wrestle with the palms. If the force exerted by both the players is equal, where are balanced forces acting?

During arm wrestling, participants put their arms on the table, and wrestle with the palms. If the force exerted by both the players is equal, where is the action, reaction force pair acting?