Which law describes inertia?

• Newton’s First Law

• Newton’s Second Law

• Newton’s Third Law

• Law of Gravitation

A ball on the ground remains still until someone kicks it. This illustrates:

• Force is unnecessary

• Inertia

• Acceleration

• Action-reaction

A moving bus suddenly stops. Passengers lurch forward due to:

• Gravity

• Acceleration

• Inertia

• Friction

Why does a book on a table remain at rest until pushed?

• Balanced forces act on it

• Gravity is absent

• Friction is zero

• Mass is small

Acceleration means:

• Speed is constant

• Direction never changes

• Change in speed and/or direction

• Mass decreases

When a net force acts on an object, it will:

• Stay still forever

• Accelerate

• Reduce its mass

• Gain inertia

A car turning around a curve is accelerating because:

• Its speed is zero

• Its direction changes

• Net force is absent

• Mass is constant

According to Newton’s 2nd Law:

• F = ma

• F = m + a

• F = m – a

• F = a/m

A 10-kg object accelerates at 2 m/s². What net force acts on it?

• 5 N

• 20 N

• 12 N

• 200 N

If mass increases but the same force is applied, acceleration:

• Increases

• Decreases

• Stays the same

• Doubles