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Gravity and space
- 1. 19/05/14 Gravity and SpaceGravityand Space
- 2. 19/05/14 GravityGravity Gravity is anattractive force that affects anything with mass: Note that this force goes both ways – the Earth is attracted to us.
- 3. 19/05/14 GravityGravity Gravity depends on2 things: If you double the distance the gravitational force divides by 4… F F/4 1) The mass of the objects 2) The distance between them F 2F If you double the mass of one object you double the force
- 4. 19/05/14 Weight vs. MassWeightvs. Mass Earth’s Gravitational Field Strength is 10N/kg. In other words, a 1kg mass is pulled downwards by a force of 10N. W gM Weight = Mass x Gravitational Field Strength (in N) (in kg) (in N/kg) 1) What is the weight on Earth of a book with mass 2kg? 2) What is the weight on Earth of an apple with mass 100g? 3) Dave weighs 700N. What is his mass? 4) On the moon the gravitational field strength is 1.6N/kg. What will Dave weigh if he stands on the moon?
- 5. 19/05/14 RocketsRockets When a rocketflies away from Earth the force needed to keep it accelerating decreases: This is because… 1) As the rocket gets further away from Earth the force of ______ decreases. 2) As the rocket burns fuel it gets _______, also decreasing the gravity downwards. Words – gravity, smaller, large, lighter _____ force needed here _____ force needed here
- 6. 19/05/14 Natural SatellitesNatural Satellites Mercury Mars Jupiter Saturn Neptune Uranus Pluto Venus Earth Theseplanets are all satellites of the sun
- 7. 19/05/14 Natural SatellitesNatural Satellites Mercury Mars Jupiter Saturn Neptune Uranus Pluto Venus Earth Theseplanets are all satellites of the sun