Chapter 5: Momentum Flashcards
A larger mass or speed results in?
A larger momentum
A smaller mass or speed results in?
A smaller momentum
When does momentum change?
When mass,velocity, or both change.
What happens if an objects velocity changes?
It accelerates
What does force produce?
Acceleration
Exerting a force over a short period of time results in?
A small change in momentum
Exerting a force over a long period of time results in?
A greater change in momentum
When changing momentum what two things are important?
Force and time
A greater impulse results in what kind of change in momentum?
A greater change
A smaller impulse resulted in what kind of change in momentum?
A smaller change
How do you increase momentum?
Increase force,time, or both
How does your momentum decrease when you hit a hard or soft object?
The same way
The same change in momentum equals what kind of change in impulse?
The same change in impulse.
To reduce force you do what?
Extend the time of contact.
For a short amount of contact time what are the forces like?
Large
For a long contact time forces are what?
Small
When is an impulse greater?
When an object bounces.
What has to occur for momentum to change?
An outside force
What happens when internal force act on a system?
No change in momentum occurs.
When momentum act in the same direction you what?
Add them
When momenta act in opposite directions you what?
Subtract
If no momentum is gained or lost it is?
Conserved
Conservation occurs in what types of collisions?
Elastic and inelastic
When objects are at rest what kind of momentum do they have?
None
