# Momentum Flashcards

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1
Q

What is the equation for momentum?

A

Momentum = Mass x Velocity

p = m x v

2
Q

What is the unit for momentum?

A

Kilogram metres/second

kg m/s

3
Q

What does the law of conservation of momentum state?

A

In a closed system, the total momentum before an event is equal to the total momentum after the event.

4
Q

Does momentum have a direction?

A

Yes

5
Q

What does a minus sign before a momentum tell us?

A

That the momentum is in the opposite direction (to another momentum).

6
Q

When two objects push apart, they move…

A

With equal and opposite momentum.

7
Q

In an explosion, what can be said about the two momentums?

A

8
Q

What is the equation for impact force?

A

Force = Change in momentum / Time

9
Q

What effect does impact time have on the force?

A

The longer the impact time, the weaker the force.

10
Q

How do seat belts and air bags help keep the passenger safe?

A

They increase impact time and spread the force over a larger area.

11
Q

How do crumple zones keep passengers safe?

A

They ‘crumple’, increasing the impact time and therefore reducing force.