Flashcards
Science: Physics Gravity
Cards in this deck (16)
- 1What is a gravitational force?Gravitational force is the force of attraction between masses.
- 2What are the two important effects of gravity?1) On the surface of a planet, it makes all things fall towards the ground.
2) It gives everything a weight. - 3What is mass?Mass is just the amount of 'stuff' in an object. For any given object this will have the same value anywhere in the universe.
- 4What is weight?Weight is the force acting on an object due to gravity (the pull of the gravitational force on the object).
- 5Why does the gravitational field strength vary with location?It's stronger the closer you are to the mass causing the field, and stronger for larger masses.
- 6What does the weight of an object depend on?The strength of the gravitational field at the location of the object.
- 7What is weight measured in?Weight is a force measured in newtons.
- 8What is its centre of mass?When the force is acting from a single point on the object. This is a point which you assume the whole mass is concentrated.
- 9What is weight measured using?A calibrated spring balance or newton meter.
- 10What is mass measured in?Kilograms
- 11What are mass and weight?Mass and weight are directly proportional.
- 12Equation:Weight(N)=Mass(kg) x Gravitational Field Strength(N/kg)
- 13Who discovered gravity?Sir Isaac Newton
- 14What is a force?A push or pull acting on an object. It can cause an object to move or change direction.
- 15What other forces act on moving objects?Friction, air resistance, counteracting gravity.
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