P2.2 Kinetic energy Flashcards

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1
Q

What happens to the kinetic energy when an object speed up?

A

Kinetic energy increases

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2
Q

When is work done?

A

When a force causes an object to move through a distance

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3
Q

What is power?

A

-Work done or energy transferred in a given time

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4
Q

What is gravitational potential energy

A
  • Energy that an object has

- By virtue of its position in a gravitational field

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5
Q

When an object is raised vertically what is work is done against? What does the object gain?

A
  • Gravitational force

- Gains gravitational potential energy.

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6
Q

What does the kinetic energy of an object depend on?

A

Its mass and its speed

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7
Q

How do forces cause a change in speed of an object?

A

By doing work

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8
Q

What is momentum and what is it measured in?

A

A property of moving objects.

kgm/s

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9
Q

Explain the conservation of momentum

A

IN A CLOSED SYSTEM, total momentum before and after the event are the SAME

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10
Q

What is a closed system?

A

A system that doesn’t exchange any matter with it’s surroundings

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11
Q

How can you tell when two objects have equal momentum?

A

When they stop when they collide

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12
Q

How can you calculate the speed of two objects that become attached when they collide? (4 steps)

A
  • Find separate MOMENTUMS of both objects
  • ADD momentums
  • And ADD MASSES of objects together
  • Find velocity
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13
Q

What happens in an elastic collision?

A

Momentum stays same

No loss of kinetic energy

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