 # Momentum - Multiple choice Multiple choice questions should take you just under 2 minutes a question! Only one of the choices is correct.

Q1. Which one of the following statements is correct?

The force acting on an object is equivalent to:

 A its change of momentum. B the impulse it receives per second. C the energy it gains per second. D its acceleration per metre.

Q2. The graph shows how the force on a glider of mass 2000 kg changes with time as it is launched from a level track using a catapult. Assuming the glider starts at rest what is its velocity in ms-1 after 40 s?

 A 2.5 B 10 C 50 D 100

Q3. A gas molecule of mass m in a container moves with velocity v.

If it makes an elastic collision at right angles to the walls of the container, what is the change in momentum of the molecule?

 A zero B 0.5 mv C mv D 2 mv

Q4. The graph shows the variation with time, t, of the force, F, acting on a body. What physical quantity does the area X represent?

 A the displacement of the body B the acceleration of the body C the change in momentum of the body D the change in kinetic energy of the body

Q5. Water of density 1000 kg m–3 flows out of a garden hose of cross-sectional area 7.2 × 10–4m2 at a rate of 2.0 × 10–4m3 per second.

How much momentum is carried by the water leaving the hose per second?

 A 5.6 × 10–5 Ns B 5.6 × 10–2 Ns C 0.20 Ns D 0.72 Ns

Q6. Which row, A to D, in the table correctly shows the quantities conserved in an inelastic
collision?

 mass momentum kinetic energy total energy A conserved not conserved conserved conserved B not conserved conserved conserved not conserved C conserved conserved conserved conserved D conserved conserved not conserved conserved

Q7. A ball of mass 2.0 kg, initially at rest, is acted on by a force F which varies with time t as shown by the graph. What is the velocity of the ball after 8.0 s? A 20 ms–1

B 40 ms–1

C 80 ms–1

D 160 ms–1

Q8. A body X moving with a velocity v makes an elastic collision with a stationary body Y of equal mass on a smooth horizontal surface. Which line, A to D, in the table gives the velocities of the two bodies after the collision?

 Velocity of X Velocity of Y A v/2 - v/2 B - v/2 v/2 C v 0 D 0 v 