Momentum  Multiple choice
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?
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 crosssectional area 7.2 × 10^{–4}m^{2} at a rate of 2.0 × 10^{–4}m^{3} 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 