# Physics-Mechanics

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- Created by: JamieH98
- Created on: 06-04-13 21:08

How do you calculate average speed?

Average speed=total distance travelled/ journey time

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What is instantaneous speed?

Instantaneous speed is when the distance and the time are short

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How do you measure acceleration given two speeds and a time?

a=v-u/t

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What is acceleration and what is it measured in?

Acceleration is the rate of change of speed and is measured in m/s²

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What is dynamics?

Dynamics is the study of forces

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What is weight?

Weight is the force produced by one object with mass pulling another object with mass.

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How are weight and mass connected?

Weight is directly proportional to mass

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How do you calculate weight?

W=mg

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What is friction?

• Frcition is the force which opposes motion and occurs when two surfaces move over each other

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What is force measured in?

Force is measured in N

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Name a force other than friction that opposes motion?

Another force which opposes motion is drag or air resistance

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How do you reduce drag?

• To reduce drag we can- reduce the area presented to the flow fluid; reduce turbulence by streamlining and reduce surface roughness

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Give an example of reducing drag?

An example of reducing drag would be a cyclist

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How do you reduce friction?

To reduce friction we can- smooth the surface and lubricate it.

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Give an example of reducing friction?

An example of reducing friction is skiing

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What is high friction important for?

However, high friction is important for: tyres; shoes and brakes

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How do you measure speed when given acceleration instead of distance and a time?

v=at

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What is Newton's first law of motion?

• Newton's first law states that if the forces acting upon an object are balanced the object will either be at rest or moving at a constant speed in a straight line.

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What is Newton's second law of motion?

Newton's second law is F=ma

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What is the resultant force?

• The resultant force is an imaginary force which would have the same effect as all the forces acting on an object

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What is Newton's third law?

• Newton's third law "for every action there is an equal and opposite reaction"

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What is a Newton's pair and give an example?

• A newton's pair is a pair of objects which have an equal and opposite reaction for example the weight of a parachutist going down and the gravitational force on earth pushing up.

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Name all the types of energy?

• Types of energy are: kinetic; gravitational potential; stain potential; chemical; heat; light; sound; nuclear; electrical and electromagnetic

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What is the first law of thermodynamics?

• The first law of thermodynamics says that energy cannot be created or destroyed, only changed from one form to another

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What is work done?

• When energy is converted from one form to another by a machine the quantity of energy transformed is called work done Ew

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What is energy measured in?

Energy is measured in J

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How do you calculate work done?

Ew=Fd

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How do you calculate potential energy?

Ep=mgh

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What is gravitational field strength measured in?

Gravitational field strength is measured in N/Kg

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How do you calculate kinetic energy?

Ek=1/2mv²

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How do you calculate power?

P=E/t

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What is power measured in?

Power is measured in J/s or W

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What is power?

Power is the measure of how quickly a machine can convert energy from one form to another

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What is 1W equal to?

1W=1J/s

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How do you calculate energy?

E=pt

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How do you calculate efficiency?

Efficiency=useful energy output/total energy input×100

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## Other cards in this set

### Card 2

#### Front

What is instantaneous speed?

#### Back

Instantaneous speed is when the distance and the time are short

### Card 3

#### Front

How do you measure acceleration given two speeds and a time?

#### Back

### Card 4

#### Front

What is acceleration and what is it measured in?

#### Back

### Card 5

#### Front

What is dynamics?

#### Back

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