# Physics - P2

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- Created by: jessicawilkinson2
- Created on: 20-05-18 13:21

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

#### Back

### Card 4

#### Front

define acceleration.

#### Back

### Card 5

#### Front

equation for acceleration.

#### Back

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