What is momentum?
The sum of mass and velocity
The product of mass and velocity
The ratio of mass and velocity
What is the unit of momentum?
Newtons per kilogram (N/kg)
Kilogram metres per second (kgm/s)
Newtons per metre (N/m)
What is the momentum of a 15 kg dog running at 4 m/s?
3.25 kgm/s
19 kgm/s
60 kgm/s
What does conservation of momentum mean?
Total momentum before is equal to total momentum after
Total momentum must decrease after a collision
All objects must start with some momentum
Trolley A of mass 10 kg and velocity 4 m/s collides with trolley B of mass 8 kg. Trolley A stops and trolley B moves off. What will be the speed of trolley B?
4 m/s
5 m/s
8 m/s
A trolley of mass 18 kg and velocity 8 m/s collides with and sticks to a stationary trolley of mass 12 kg. What is the speed of the trolleys after the collision?
4.8 m/s
8.4 m/s
9.2 m/s
How is work done calculated?
work done = force ÷ distance
work done = force × distance
work done = distance + force
A force of 340 N moves a crate through a distance of 18m. How much work has been done?
6,120 J
18.9 J
358 J
What is power?
The rate at which energy is transferred or work is done
The distance an object travels after experiencing a force
The energy stored in an object at rest
What type of quantity is momentum?
Vector
Scalar
Distance