Dynamics

Newton's first law of motion is also called the law of:

• 1 Gravitation
• 2 Acceleration
• 3 Momentum transfer
• 4 Inertia

What force is needed to give a mass of 5 kg an acceleration of 3 m/s²?

• 1 8 N
• 2 1.7 N
• 3 15 N
• 4 2 N

What is the SI unit of momentum?

• 1 kg m/s²
• 2 N
• 3 J
• 4 kg m/s

When a gun fires a bullet, the gun recoils. This is explained by:

• 1 Newton's second law
• 2 Newton's first law
• 3 Newton's third law
• 4 Law of gravitation

What is the weight of a 10 kg mass on Earth? (g = 10 m/s²)

• 1 10 N
• 2 1 N
• 3 100 N
• 4 0.1 N

The force that opposes the motion of one surface over another is called:

• 1 Thrust
• 2 Friction
• 3 Tension
• 4 Gravity

Inertia of a body depends on its:

• 1 Colour
• 2 Mass
• 3 Shape only
• 4 Temperature

Newton's second law is written as:

• 1 F = m / a
• 2 F = m + a
• 3 F = m a
• 4 F = a / m

What is the momentum of a 0.5 kg ball moving at 4 m/s?

• 1 2 kg m/s
• 2 0.125 kg m/s
• 3 4.5 kg m/s
• 4 8 kg m/s

Rolling friction is generally ___ sliding friction.

• 1 More than
• 2 Double
• 3 Less than
• 4 Equal to