Gravity & Orbits

Mass is...

• A force

• The amount of matter in an object

• Measured in Newtons

• Measured in grams or kilograms

Weight is...

• A force

• The amount of matter in an object

• Measured in Newtons

• Measured in grams or kilograms

• Caused by gravity pulling masses together

If you send a package to Mars, the mass of the package...

• Increased

• Remains the same

• Decreases

If you send a package to Mars, the weight of the package...

• Increased

• Remains the same

• Decreases

On a planet, an object's weight force always acts...

• Downwards

• Towards the centre of the planet

• Upwards

Planets with stronger gravitational fields....

• Have larger masses

• Have smaller masses

• Are bigger

• Have longer orbits

The force that holds the Earth in orbit around the Sun is...

• Thrust

• Drag

• Gravity

• Mass

On Earth g = 10N/kg. What is the weight of a 5kg object? ____ N

On Mars g = 4N/kg. What is the weight of a 5kg object on Mars? _____ N

The force that keeps satellites in orbit around the Earth is...

• Thrust

• Drag

• Gravity

• Mass