1) What are the units of momentum?  

a) kgm/s
b) kgm/s²
c) m/s
d) m/s²

2) A trolley of mass 0.5kg travelling at 1m/s collides with, and remains attached to a stationary trolley of mass 1kg. The combined momentum is:  

a) 1/3 kgm/s
b) 2/3 kgm/s
c) 1 kgm/s
d) 1/2 kgm/s
e) 3/4kgm/s

3) During an elastic collision:  

a) momentum but not kinetic energy are conserved
b) momentum and kinetic energy are conserved
c) kinetic energy but not momentum is conserved
d) neither kinetic energy or momentum are conserved
e) kinetic energy is converted to potential energy  

4) A bullet of mass 1g is fired from a gun at a velocity of 500m/s. The gun has a mass of 1kg. The recoil velocity of the gun is:  

a) 500m/s
b) 50m/s
c) 5m/s
d) 0.5m/s
e) some other value  

5) An object of mass m is acted on by a constant force for a time t. This has the effect of changing the velocity of the body from u to v by a uniform acceleration a. The change in momentum is:  

a) 0.5m(v² - u²)
b) m(v-u)
c) m(v-u)t
d) ma
e) ma/t  

6) An object A of mass 2 units and moving with a velocity v collides with a stationary object B of mass 3 units. If the objects stick together their velocity after the collision is:  

a) (2/5)v
b) v
c) (3/2)v
d) 2v
e) (5/2)v  

7) A car of mass 550kg crashes into a stationary lorry of mass 2000kg. If the car was travelling with a velocity of 40m/s what is their combined speed - assuming that they join together on impact.  

a) 10m/s
b) 6.25m/s
c) 8m/s
d) 12m/s
e) 16m/s  

8) A cyclist can produce a driving force of 500N. If the combined mass of herself and the bike is 100kg calculate their momentum after accelerating from rest for 10 seconds.  

a) 5kgm/s
b) 500kgm/s
c) 200kgm/s
d) 2000kgm/s
e) 5000kgm/s  

9) A mass of 200kg travelling at 30m/s is brought to rest in 2 seconds - what constant force is required?  

a) 2000N
b) 400N
c) 12000N
d) 3000N
e) 13.3N  

10) A hosepipe of diameter 1cm releases water with a velocity of 200m/s. Calculate the force of the water jet. (Take the density of water = 1000kg/m³)  

a) 3142N
b) 314.2N
c) 10000N
d) 20000N
e) 200N