Flashcards
Physics revision 2017
Cards in this deck (32)
- 1A force is best defined as....A push or pull influence that changes the speed, shape, or direction of an object.
- 2What is the definition of Energy? (It is the ability to...., Is only detected when.....)The ability to do work. Is only detected when it causes a change to matter.
- 3What is the best definition for Mass?The amount of substance. Tells you how many particles you have and is measured in Kg.
- 4What is the best definition of Weight?The force of gravity pulling on a mass. It is a force and is measured in Newtons.
- 5What is the best definition of Gravity?A force of attraction between masses. It is a property of mass and is measured in Newtons.
- 6What is the acceleration caused by Gravity on Earth? in m/s9.8m/s^2
- 7What is Friction best described as?A force that acts in opposition to the movement of an object and produces heat.
- 8What is 'Work'?Work is the physical effects of energy and is measured in Joules.
- 9How is work calculated?Force X Distance
- 10What is Velocity and how is it measured?Velocity is speed with direction and is measured in m/s
- 11What does The Law Of Conservation Of Energy state?That energy cannot be created nor destroyed, only transferred and transformed.
- 12What is a gravitational force and what does it do?A gravitational force is one to do with gravity and pulls large objects towards it.
- 13What is a support force and what does it do?A support force is an upwards force that a surface exerts on an object which rests on it.
- 14What is a thrust force?A force that pushes an object forward.
- 15What is a resistance/friction force?A resistance/friction force is one that acts in the opposite direction to the movement of an object.
- 16Forces are balanced when........ They are the same size and act in the opposite direction.
- 17The Net force acting on something is the sum of...... All the forces acting on an object.
- 18What are the two situations when forces are said to be balanced on an object?When the object isn't moving.
When the object is moving in a straight line at a consistent speed. - 19What is Newton's first law of motion?A body in motion will remain in motion until an external, unbalanced force acts upon it.
- 20What is Newton's second law of motion?An external, unbalanced force will cause an object to accelerate in the direction of he force.
- 21What is Newton's third law of motion?For every action there is an equal and opposite reaction
- 22What is Kinetic Energy?Energy gained from movement. Speed has more of an impact on Kinetic Energy than Mass.
- 23What is Potential Energy?The energy gained by on object, relative to it's position. Both the Mass and Height of an object have an influence on the amount of Potential energy. It is also known as Stored energy.
- 24What is Internal Energy?The sum of all energies in an object and includes the Potential and Kinetic energies, atoms and the stored chemicals.
- 25What is the formula for Potential energy?Ep = mgh (mass x gravity x height)
- 26What is the formula for Kinetic Energy?Ek = 1/2mv^2 (Half mass x velocity squared)
- 27What is Velocity measured in?V = m/s
- 28What is Gravity's measurement?G = 9.8ms^-2
- 29What is Convection?Convection is the transfer of heat through the air.
- 30What is Conduction?Conduction is the transfer of heat through touch, but not necessarily friction.
- 31What is the formula to work out Efficiency?Efficiency = Useful Energy out / Energy In
- 32List 10 DIFFERENT types of energy.Kinetic, Potential, Wave, Light, Nuclear, Gravitational, Chemical, Elastic, Sound, Magnetic.
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- All year 8 Physics revision with definitions, formulae and example questions included.
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- Annalise Watson
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