Momentum

HideShow resource information
• Created by: Lotto65
• Created on: 22-12-15 10:30
What objects have momentum?
Moving objects
1 of 25
How do you get a bigger momentum?
A greater mass and greater velocity of the object
2 of 25
What is the unit of momentum?
kgm/s Kilogram metres per second
3 of 25
What is the equation symbol for momentum?
p
4 of 25
What is the law of conservation of momentum?
Provided no external forces act on them, when objects interact, the total momentum before equals the total momentum afterwards
5 of 25
How can you say the law of conservation of momentum more concisely?
The total momentum is unchanged; The change in total momentum is zero
6 of 25
Give examples of interactions between objects
Collisions or explosions
7 of 25
How might two objects move after a collision?
Move off together or move apart
8 of 25
When can you make momentum change?
Adding a force on an object that is able to move or is moving
9 of 25
The longer the time taken for the momentum to change...
The smaller the force that acts
10 of 25
What is impact time?
The time which a force acts, usually in a collision
11 of 25
The shorter the impact time...
The larger the force
12 of 25
The longer the impact time...
The smaller the force
13 of 25
What do crumple zones do?
Fold in a collision
14 of 25
How do crumple zones help?
Increase the impact time so reduce the force on the car and the people in it
15 of 25
How do seatbelts help?
Increase the time over which the wearer's momentum changes and reduces the force of an impact
16 of 25
What else folds in a collision (in a car) as well as crumple zones?
Side impact bars
17 of 25
How do seatbelts and airbags help?
Increase the surface area over which forces act on the body. This slows the change in momentum and reduces the force
18 of 25
How does a seatbelt increase impact time?
It stretches and stops the wearer being flung forwards
19 of 25
What does a collapsible steering wheel do?
Collapses if pressed against the driver's chest on impact
20 of 25
What sort of quantity is momentum? Why?
A vector because it has size and direction
21 of 25
Describe a way of saying the conditions when the law of conservation of momentum happen?
In a closed system
22 of 25
Can you have negative momentum?
Yes. In questions that involve movement in different directions, one will be positive and the other negative- YOU DECIDE
23 of 25
The larger the force... (momentum)
The faster the change of momentum
24 of 25
How do motorcycle helmets help?
Provide padding so it takes longer for your head to come to a stop. Thus, increasing the impact time and decreasing the force
25 of 25

Other cards in this set

Card 2

Front

How do you get a bigger momentum?

Back

A greater mass and greater velocity of the object

Card 3

Front

What is the unit of momentum?

Card 4

Front

What is the equation symbol for momentum?

Card 5

Front

What is the law of conservation of momentum?