Flashcards
Physics module 4
Cards in this deck (22)
- 1Explaining Motion P4-Speed and velocity
-S-T and D-T diagrams
-Interaction pairs and forces
-Balanced/ unbalanced forces
-Momentum
-Work
-Energy - 2SpeedSpeed= distance/ time
- 3VelocityVelocity is speed with direction
- 4Instantaneous speedThe speed you are doing in that instant
- 5Distance-Time graphsA DT graph plots the position of an object along a time axis in a journey. The graph can be used to calculate speed at certain points and has features you need to recognise.
- 6DisplacementThe distance between starting point and object in a particular direction (Not distance journeyed)
- 7AccelerationAcceleration= change in speed/ time taken for change
- 8ForcesForces are everywhere making things move or keeping them in their place. Measured in Newtons, N they push and pull everything.
- 9Examples of forcesGravity
Air resistance
Magnetic
Upthrust
Friction
Lift - 10Interaction pairs of forcesObjects start moving (or stop) due to forces acting on them. Consider two people on an ice rink.
One force acts on one object, one force acts on another. Opposite directions. Forces are equal in size. - 11GravityGravity is another non-contact force and it will also come in interaction pairs, although the force is hard to spot.
Gravity is due to Earth's pull on apple.
Gravity is due to apple's pull on Earth. - 12EnergyEnergy is property of an object, transferable between 9 different types (but can't be created or destroyed)
It is measured in Joules, J - 139 different types of energySound
Chemical
Electrical
Kinetic
Gravitational potential
Elastic
Nuclear
Heat
Light - 14An object that is moving has kinetic energyKE= 1/2 mass X velocity squared
- 15An object that has been lifted has gravitational potential energy, a measure of what it could go on to doGPE= weight X height
- 16WorkWork is done whenever a force acts on a moving object. The amount of work is found by multiplying the force with the distance moved in that direction; it is the same as the energy transferred.
- 17MomentumMomentum is another abstract quantity linked to motion. Momentum is always conserved.
Momentum= mass X velocity - 18Change in momentumForces change the momentum of an object. The bigger the force or the longer it acts for, the greater the momentum change.
Change in momentum= force X time - 19Kinetic energyKinetic energy may not be conserved.
Also, it does not have a direction. - 20Crumple zonesMakes the duration of the collision longer
Makes the average force exerted on the car less
The longer time it takes to change a passengers speed to zero, the smaller the average force exerted. - 21Seat beltsMakes change of momentum take longer
Top part of the body will move forward - 22Air bagCushions impact
Reduces momentum
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- Flashcards on Physics module 4, created by Doobs C on 08/12/2014.
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- Doobs C
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