# Shared Flashcard Set

## Details

gcse ocr p4 revision cards
module: explaining motion
24
Physics
01/03/2012

## Additional Physics Flashcards

Term
 What are the characteristics of interaction pairs?
Definition
 Equal in sizeOpposite in directionAct on different objects
Term
 Explain how cars move, using terms about interaction pairs
Definition
 The tyres push backwards against the ground, the interaction pair is the ground pushing the car forward
Term
 Explain how rockets move, using terms about interaction pairs
Definition
 Hot gas is pushed out of the base of the rocket, this leads to the rocket being pushed upwards, in the opposite direction
Term
 What is the upwards force exerting by a surface called?
Definition
 Reaction
Term
 Define resultant force
Definition
 The sum of all the forces adding together
Term
 How do you calculate the average speed?
Definition
 Distance / Time
Term
 Define Instantaneous speed
Definition
 Speed at a particular moment
Term
 Explain how the police use radar guns to measure a vehicles speed
Definition
 The guns bounce microwave radiation off approaching cars, the guns then pick up the radiation and calculate the speed
Term
 Define velocity
Definition
 The speed in a certain direction
Term
 Change in momentum
Definition
 Force x time
Term
 Mass x velocity
Definition
 Momentum
Term
 When two objects interact, what is the total change of momentum (taking direction into account)
Definition
 Zero
Term
 Define explosions
Definition
 Where two objects push apart
Term
 Explain what seatbelts are designed for
Definition
 Seatbelts strech during a collision. This makes the change in momentum take longer. By increasing the time the collision lasts, this decreases the size of the force
Term
 Complete the sentence:If the resultant force acting on an object is zero, the momentum of the object ..........
Definition
 Does not change
Term
 Complete the sentence:If there is a resultant force acting on an object, the momentum of the object...........
Definition
 Will change in the same direction as the resultant force
Term
 When travelling at a steady speed, Driving force =
Definition
 Counter force
Term
 Work done by a force =
Definition
 Force x distance moved
Term
 Lifting things increases their
Definition
 Gravitational potential energy
Term
 Making things speed up increases their
Definition
 Kinetic energy
Term
 Change in kinetic energy =
Definition
 Work done by a pushing force= force x distance
Term
 The amount of work depends on
Definition
 The force you have to exertThe distance moved in the direction of the force
Term
 Amount of energy transferred =
Definition
 Amount of work done
Term
 When a roller coaster runs down a slope, it
Definition
 Loses GPE and gains KE
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