# Physics - P2

define + give examples of scalars.
figures that are only numbers, eg: distance, speed, weight
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define + give examples of vectors.
figures that are numbers and have directions, eg: velocity, acceleration
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equation for distance travelled
speed x time
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define acceleration.
rate in change of velocity.
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equation for acceleration.
change in velocity / time taken
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list equipment for measuring distance and time.
distance: tape measure, ruler, trundle wheel. time: stopwatch, light gates.
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what does a flat line on a distance/time graph mean?
object is stationary (still)
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what does the gradient on a distance/time graph mean?
speed object has travelled at. steeper = faster
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what does the area under a velocity/time graph mean?
distance travelled.
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what does a flat line on a velocity/time graph mean?
object is moving at a steady velocity.
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what does the gradient on a velocity/time graph mean?
acceleration. steeper = faster acceleration
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what is resultant force?
overall force acting on an object.
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equation for resultant force
mass x acceleration
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if an object has zero resultant force, how is it moving?
it is stationary (still), as forces are balanced, or in equilibrium.
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if an object has non-zero resultant force, how is it moving?
it is accelerating/decelerating, as the forces are unbalanced.
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what is contact force?
where two objects must be touching, eg: pulling a trolley.
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what is non-contact force?
where two objects aren't touching, eg: magnetic forces
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what is Newton's first law?
if an object has zero resultant force, there is no change in velocity.
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what is Newton's second law?
if an object has non-zero resultant force, it will accelerate/decelerate.
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equation for force (1)
mass x acceleration
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what is Newton's third law?
reaction forces are opposite and equal.
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what if the friction force = driving force?
object will move at steady speed.
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what if the friction force < driving force?
object will accelerate.
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what if the friction force > driving force?
object will decelerate.
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describe the journey of a skydiver. include terminal velocity, air resistance, gravity, weight.
1) skydiver jumps out of plane, weight > resistance 2) air rest. inc, weight = resistance, terminal velocity 3) parachute pulled, resi. < weight 4) as velocity and rest. decrease, weight = resistance
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equation for momentum.
mass x velocity
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equation for force (2)
change in momentum/time
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what is an elastic collision?
where the object returns to normal after forces are removed, eg: elastic band
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what is a plastic collision?
where the object does not return to normal after forces are removed, eg: plasticine.
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equation for kinetic energy.
0.5 x mass x speed ^ 2
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equation for work done.
force x distance
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equation for power
work done / time
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equation for force by spring.
extension x spring constant
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equation for energy transferred in stretching.
0.5 x spring constant x extension ^ 2
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## Other cards in this set

### Card 2

#### Front

define + give examples of vectors.

#### Back

figures that are numbers and have directions, eg: velocity, acceleration

### Card 3

#### Front

equation for distance travelled

### Card 4

#### Front

define acceleration.

### Card 5

#### Front

equation for acceleration.