Unit 2 Topic 4 Quiz

Momentum =
1. force x speed
2. mass x speed
3. mass x velocity
4. mass x accleration
Momentum is a useful concept in physics because:
1. you can buy a momentum
2. it explains how objects accelerate
3. it explains how energy is created and destroyed
4. it helps to explain collisions
Which one of these observation is explained by momentum?
1. A snooker ball colliding with another and bouncing off.
2. A load being lifted by a crane.
3. An electric current flowing in a wire.
4. An athlete braking a world record
The units for momentum are:
1. kg m/s
2. kg m s
3. m s/kg
4. m / s kg
Which one of these is important when doing momentum problems?
1. The speed
2. The direction
3. The time
4. The acceleration
Momentum is:
1. destroyed in all collisions and explosions
2. destroyed in collisions and created in explosions
3. destroyed in explosions but conserved in collisions
4. conserved in all explosions and collisions.
A gun is fired. For momentum to be conserved:
1. there is a recoil in the same direction as the direction of the bullet
2. there is a recoil in the opposite direction to the direction of the bullet
3. there is no recoil
4. the bullet will not move
In a car it is important to wear a seat belt because
1. you will accelerate out of your seat to hit the windscreen
2. the windscreen will accelerate towards you until it hits you.
3. in an accident, your momentum will make you carry on at the same speed unitl you hit the windscreen
4. you will be fined if you don't.
Cars have crumple zones to:
1. to make damage more severe in an accident, so that the manufacturer can sell a new car.
2. to reduce the damage to the car in the event of an accident.
3. decrease the time taken for the change in momentum to occur in an accident.
4. increase the time taken for the change in momentum to occur in an accident.
A common bear trap in momentum calculations is to:
1. write speed
2. write velocity
3. give the units as kg m/s
4. give the units as Ns