Newton's Second Law

What does the area beneath a Force-Time graph give you?

• Action

• Impulse

• Energy

• Acceleration

In an Elastic Collision which quantities are NOT conserved?

• Kinetic Energy

• Total Energy

• Total Momentum

• None of the above

(At A level) What is Newton's 2nd Law?

• F = ma

• When two objects interact they exert equal and opposite forces on each other

• The net force on an object is directly proportional to the rate of change of momentum

• If the forces on an object are balanced it will remain at a constant velocity

In and INELASTIC collision which quantity is NOT conserved?

• Kinetic Energy

• Energy

• Momentum

• Mass

What are the two units that can be used for momentum and impulse?

• N/s

• Ns

• Kgm/s

• Kg/ms

What is the net force applied to a 1.2Kg brick going from 10m/s to rest in 0.25s.

• 30N

• 48N

• 0.48N

• 3N

Calculate the change in moment of a car that was pushed with a force of 750N for 5s

• 3750Kgm/s

• 150Kgm/s

• 750Kgm/s

• 1500Kgm/s

A javelin thrower exerts a force of 100 N on a javelin for a time of 0.30 s.The javelin has a mass of 0.80 kg. What is the rate of change of the momentum of the javelin?

• 24kgm/s²

• 30kgm/s²

• 100kgm/s²

• 125kgm/s²

An object P is travelling to the right with a momentum of 40 kg m s⁻¹. It collides with another object Q travelling to the left along the same path.The final momentum of P is 10 kg m s⁻¹ to the right.What is the change in the momentum of Q?

• 0 kg m s⁻¹

• 10 kg m s⁻¹

• 30 kg m s⁻¹

• 50 kg m s⁻¹

A ball, initially at rest, is struck by a hockey stick. It leaves the hockey stick at speed v. Which quantity, together with the mass of the ball, can be used to determine v?

• The time of the impact.

• The weight of the hockey stick.

• The impulse of the force.

• The final momentum of the hockey stick.