AQA PHYSICS-P1-Energy and energy resources

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21 Terms

1

Energy

Energy is the ability to do work

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2

Work

Transfer of energy when a force moves through a distance in the direction of force

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3

Force

A Push or a Pull that causes the velocity to change

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4

Law of Conservation of Energy

Energy can be transferred usefully, stored or dissipated, but it cannot be created or destroyed.

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5

Velocity

Velocity is a measure of how fast something is moving in a specific direction.

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6

Speed

How fast an object is moving

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7

Vector

A quantity that has both magnitude and direction

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8

Kinetic store

The energy stored by an object’s movement.

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9

Gravitational potential store

-The energy stored in objects raised above the Earth’s surface.

- This energy exists because of the Earth’s gravitational field

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10

Chemical Store

Energy stores by the chemical bonds between atoms.

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11

Elastic Potential store

The energy stored when an object is being stretched, compressed or sqaushed

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12

Nuclear store

The energy stored in the nucleus of an atom. The energy in the nuclear store can be released by radioactive decay.

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13

Internal (thermal) store

The internal store of energy is the sum of the kinetic energy stored in the particles of an object and the chemical energy stored in chemical bonds between particles in the object.

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14
<p>What happened when an object falls freely?</p>

What happened when an object falls freely?

  • When an object falls freely, it accelerates due to gravity as it falls.

  • The force of gravity causes the gravitational potential store to transfer into its kinetic energy store.

<ul><li><p>When an object falls freely, it accelerates due to gravity as it falls.</p></li><li><p>The force of gravity causes the gravitational potential store to transfer into its kinetic energy store.</p></li><li><p></p></li></ul>
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15

What energy stores and transfers happen on a roller coaster?

  • As a roller coaster climbs an incline, the gravitational potential energy store increases

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16

When an object is moved by a force

Work is done

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17

Formula for Work done

Work done = force applied x distance moved along the line of action of the force.

<p>Work done = force applied x distance moved along the line of action of the force.</p>
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18

Work done = Energy transferred

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19

Work done by a force depends on

  • the size of the force

  • the distance moved

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20

Work Done to overcome friction is mainly transferred to thermal energy stores by heating

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21

Key Points

  • Work is done on an object when a force makes the object move

  • Energy Transferred=Work done

  • Work done to overcome friction is transferred energy to the thermal energy stores of the objects that rub together and to the surroundings.

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