Lesson 1 Laws of Motion

Q1. What force is needed to accelerate a 2 kg body at 4 m s⁻²?

8 N 6 N 2 N 12 N

Q2. For complete equilibrium of a rigid body, what additional condition may be required?

Net torque must be zero Speed must increase Mass must be zero Temperature must change

Q3. Impulse is equal to:

Change in momentum Change in mass Square of speed Potential energy

Q4. Which is the general form of Newton’s second law?

F = dp/dt F = mv F = ma² F = m/g

Q5. When the same force acts on two objects, the object with greater mass will have:

Less acceleration Greater acceleration Always the same acceleration Zero mass

Q6. Gravity is what type of force?

A force acting at a distance Only a contact force Only electric force Frictional force

Q7. Which is a good example of inertia of rest?

Passengers lean backward when a bus starts suddenly A bicycle moving fast A ball rolling Water boiling

Q8. The inertia of an object mainly depends on its:

Mass Speed Shape only Colour

Q9. The slope of a momentum–time graph gives:

Force Velocity Distance Mass

Q10. When is the momentum of an object zero?

When the object is at rest When its mass doubles When its speed increases When it is at a height