# Physics-Mechanics

2.0 / 5

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

How do you calculate average speed?

Average speed=total distance travelled/ journey time

1 of 36

What is instantaneous speed?

Instantaneous speed is when the distance and the time are short

2 of 36

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

a=v-u/t

3 of 36

What is acceleration and what is it measured in?

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

4 of 36

What is dynamics?

Dynamics is the study of forces

5 of 36

What is weight?

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

6 of 36

How are weight and mass connected?

Weight is directly proportional to mass

7 of 36

How do you calculate weight?

W=mg

8 of 36

What is friction?

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

9 of 36

What is force measured in?

Force is measured in N

10 of 36

Name a force other than friction that opposes motion?

Another force which opposes motion is drag or air resistance

11 of 36

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

12 of 36

Give an example of reducing drag?

An example of reducing drag would be a cyclist

13 of 36

How do you reduce friction?

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

14 of 36

Give an example of reducing friction?

An example of reducing friction is skiing

15 of 36

What is high friction important for?

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

16 of 36

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

v=at

17 of 36

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.

18 of 36

What is Newton's second law of motion?

Newton's second law is F=ma

19 of 36

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

20 of 36

What is Newton's third law?

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

21 of 36

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.

22 of 36

Name all the types of energy?

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

23 of 36

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

24 of 36

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

25 of 36

What is energy measured in?

Energy is measured in J

26 of 36

How do you calculate work done?

Ew=Fd

27 of 36

How do you calculate potential energy?

Ep=mgh

28 of 36

What is gravitational field strength measured in?

Gravitational field strength is measured in N/Kg

29 of 36

How do you calculate kinetic energy?

Ek=1/2mv²

30 of 36

How do you calculate power?

P=E/t

31 of 36

What is power measured in?

Power is measured in J/s or W

32 of 36

What is power?

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

33 of 36

What is 1W equal to?

1W=1J/s

34 of 36

How do you calculate energy?

E=pt

35 of 36

How do you calculate efficiency?

Efficiency=useful energy output/total energy input×100

36 of 36

## 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

## Similar Physics resources:

2.0 / 5

3.0 / 5

3.0 / 5

5.0 / 5

Teacher recommended

0.0 / 5

1.0 / 5

0.0 / 5

3.0 / 5

## Comments

No comments have yet been made