A larger force means…

…a faster change of momentum so a greater acceleration.

Some car safety features slow people down over a longer time. What does this do to their force?

Theshorter it takes for change in momentum=smaller the force

What is the conservation of momentum?

Closed system: total momentum before event is the same after, No external forces act on the momentum before=momentum after

Momentum increases as…

…the mass increases., …the velocity increases.

What is an elastic collision?

Kinetic energy before collision is equal to after.

If someone's momentum changes very quickly…

…the forces on the body will be very large., …they are more likely to get injured.

A gun's momentum before shooting is 0, the gun moves backwards after shooting. Why?

The conservation of momentum., Total momentum before is 0 so after must still be 0.

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Momentum

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Questions 10

Answers

1
A larger force means…
…a faster change of momentum so a greater acceleration.
…a slower change of momentum so a smaller acceleration.
…a slower change of momentum so a greater acceleration.
…a faster change of momentum so a smaller acceleration.
2
What is the unit for momentum?
g m/s
kg m/s^2
kg m/s
g m/s^2
3
Some car safety features slow people down over a longer time. What does this do to their force?
The longer it takes for change in momentum=smaller the force
Theshorter it takes for change in momentum=smaller the force
The shorter it takes for change in momentum=larger the force
The longer it takes for change in momentum=larger the force
4
When you rearrange the formula of momentum, how do you find velocity?
m=p/v
v=p/m
p=m*v
m/s=kgm/s / kg
5
What is the conservation of momentum?
Closed system: total momentum before event is the same after
Energy cannot be created or destroyed, only transferred.
No external forces act on the momentum before=momentum after
Forces act on the total momentum before and after an event.
6
Momentum increases as…
…the mass increases.
…the velocity increases.
…the object stops faster.
…the mass and velocity decreases.
7
A change in momentum occurs when…
…part of the kinetic energy is lost.
…no force acts on an objects.
…some of the energy is transferred into another form.
…a force acts on an object.
8
What is an elastic collision?
Kinetic energy after a collision increases.
Kinetic energy before a collision is less than after.
Kinetic energy after collision decreases.
Kinetic energy before collision is equal to after.
9
If someone's momentum changes very quickly…
…the forces on the body will be very large.
…they are more likely to get injured.
…the forces on the body will be very small.
…more likely to be safe.
10
A gun's momentum before shooting is 0, the gun moves backwards after shooting. Why?
Conservation of energy.
The conservation of momentum.
Total momentum before is 0 so after must still be 0.
A science fairy makes the shooter lose control of the gun.

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