Slides in this set
What is momentum?
"Momentum" is a very useful term that was devised to
help us to control our environment and to predict how
collisions will turn out.
If you think of something being thrown at a pane of
glass, the outcome will depend on what is being
thrown (its mass) and on how fast it is travelling (its
Very simply then: Momentum = mass x velocity
The unit of momentum does not have a name after a
particular scientist, so can be remembered from the
way in which it is calculated. It is : kg m/s…read more
Think of a bowling ball (2kg) moving towards a
stationary penguin (1kg) at a high speed.
Now think of a tennis ball (60g) kicked very gently
towards the same penguin.
The effect the different amounts of momentum
(contained by each object) has on the penguin is
immediately obvious!…read more
Worked Examples: 1
What is the momentum of a trolley that has a mass of
3kg if its moving at a constant speed of 2.5m/s?
Momentum = mass x velocity = 3 x 2.5= 7.5 kg m/s
Consider a trolley that has a mass of 4kg, moving at a
constant speed of 2m/s towards a second trolley of
identical mass. If this trolley is moving in the same
direction at 1m/s, what is the total momentum of this
Total Momentum = (4 x 2) + (4 x 1) = 8 + 4= 12 kg m/s…read more