Forces and Motion

Question 1

Accelerate

Answer 1

To change speed

Question 2

Air resistance

Answer 2

A force that slows things down when moving through air. It is caused by friction and by the object pushing the air out of its way.

Question 3

Balanced forces

Answer 3

When two forces on an object are the same strength, but in opposite directions

Question 4

Drag

Answer 4

Another name for air/water resistance

Question 5

Fluid

Answer 5

A gas or liquid

Question 6

Friction

Answer 6

A force between two objects that are touching. It usually acts to slow things down or prevent movement.

Question 7

Resultant force

Answer 7

The difference between forces in two opposite directions.

Question 8

Unbalanced forces

Answer 8

When two forces in opposite directions are not the same strength

Question 9

Upthrust

Answer 9

A force that pushes things up

Question 10

Water resistance

Answer 10

A force that slows things down that are moving through water. It is caused by friction and by the object pushing the water out of the way

Question 11

Weight

Answer 11

The amount of force with which gravity pulls something towards the earth. It is measured in newtons (N)

Question 12

Chemical energy

Answer 12

Energy that is stored in chemicals eg. Fuel, batteries and food.

Question 13

Deform

Answer 13

Change shape

Question 14

Dissipate

Answer 14

Spread out

Question 15

Efficiency

Answer 15

How much energy something wastes

Question 16

Elastic potential energy

Answer 16

Energy stored in stretched or squished things that can change back to their original shape. Otherwise known as strain energy.

Question 17

Electricity

Answer 17

A way of transferring energy through wires

Question 18

Gravitational potential energy

Answer 18

Energy stored in objects in high places that can fall down.

Question 19

Kinetic energy

Answer 19

A name used to describe energy when it is stored in moving things

Question 20

Law of conservation of energy

Answer 20

The idea that energy can never be created or destroyed, only transferred from one store to another.

Question 21

Light

Answer 21

Transferring energy by waves. Light waves can travel through transparent materials and through empty space.

Question 22

Nuclear energy

Answer 22

Energy stored in materials

Question 23

Solar energy

Answer 23

Energy from the sun

Question 24

Thermal energy

Answer 24

Energy stored in hot objects.

Question 25

Mean speed

Answer 25

Total distance / time taken = mean speed

Question 26

Distance time graph

Answer 26

Shows how far/fast something travels on a journey

Steeper the lines means faster traveled

Question 27

Relative speed

Answer 27

The speed of one object compared to another - both could be moving

Question 28

Distance multiplier

Answer 28

A lever or other machine where the load moves further than the effort

Question 29

Effort

Answer 29

The force used eg. Force used when pulling the load

Question 30

Load

Answer 30

The weight or force in something. For a machine, the load is the weight that is being moved.

Question 31

Fulcrum

Answer 31

A point on which something turns. Another name for a pivot.

Question 32

Moment

Answer 32

That turning effect of a force.

Force X Distance from the force to the pivot

Question 33

Work

Answer 33

The energy transferred when a force moves an object.

Work = force x distance moved in the direction of the force