Electromagnetism + bell

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The Earth's gravitational force pulls objects towards the centre of the Earth.

"Down" is towards the centre of the Earth, wherever you are on the planet

Slide 10

Gravitational Field

Earth’s gravitational force makes the ball move down towards the centre of the Earth.

Sun’s gravitational force makes the Earth move in an orbit around the Sun.

Slide 11

Electric Fields

An electric field shows us how electric charges behave around each other.

See what elec field looks like: http://www.colorado.edu/physics/2000/waves_particles/wavpart3.html

Slide 12

Electric Fields

Positive and negative charges attract each other.

What do two positive charges do to each other?

Slide 13

Electric Fields

Lightning discharges an excess of positive and negative charge within clouds, between clouds, or between clouds and the ground.

Slide 14

Extension:

Physics textbook:

Read p78-79 – Gravity

Try questions 4 & 5 on p81.

Read p139/140 and try questions.