Lesson 1 Laws of Motion

Q1. What is the SI unit of linear momentum?

kg m s⁻¹ N m J s kg m²

Q2. What can cause a change in the state of motion of an object?

Force Mass Density Temperature

Q3. For the same force, increasing the time of action changes impulse by:

Increasing it Decreasing it No change Making it zero

Q4. Impulse is equal to:

Change in momentum Change in mass Square of speed Potential energy

Q5. For translational equilibrium, the net force should be:

Zero Maximum Always 9.8 N Always positive

Q6. Why do passengers lean backward when a vehicle suddenly accelerates?

Inertia of rest Inertia of motion Directional inertia Buoyancy

Q7. If an object changes direction while keeping the same speed, it has:

Acceleration Loss of mass Zero force Only potential energy

Q8. Which is the general form of Newton’s second law?

F = dp/dt F = mv F = ma² F = m/g

Q9. The area under a force–time graph represents:

Impulse Mass Distance Speed

Q10. A 10 N net force acts on a 5 kg body. What is its acceleration?

0.5 m/s² 2 m/s² 5 m/s² 50 m/s²