DESCRIPTION

Contact force / non-contact force

Specific force, e.g. friction force

A ball is thrown into the air and falls back to Earth.

3.1

3.2

An object is pulled.

3.3

3.4

The force that acts against a force pulling an object along a rough surface.

3.5

3.6

An iron nail is attracted by a magnet.

3.7

3.8

A mass hangs from a rope.

3.9

3.10

A positive and negative charge attract each other.

3.11

3.12

Two negative charges repel each other.

3.13

3.14

A nail is hit into a wall.

3.15

3.16

A mass is attached to a scale.

3.17

3.18

The north poles of two magnets repel each other.

3.19

3.20

A rubber band that is stretched.

3.21

3.22

A sponge that is squeezed dry.

3.23

3.24