# Section 1- Motion, Forces And Conservation Of Energy Flashcards Preview

## Physics GCSE Edexcel > Section 1- Motion, Forces And Conservation Of Energy > Flashcards

Flashcards in Section 1- Motion, Forces And Conservation Of Energy Deck (38)
1
Q

scalar

A

Quantities that have magnitude but not direction

Eg.speed,distance,mass etc

2
Q

vector

A

-quantities with a magnitude (size) and a direction

3
Q

equation for speed distance time

A

D

SxT

4
Q

acceleration

A

The change in velocity in a certain amount of time

5
Q

equations for acceleration

A

A=(v-u)/t

6
Q

A

Y
—-
X

7
Q

what is Newton’s 1st law?

A

A force is needed to make something start moving, speed up or slow down

8
Q

what is Newton’s 2nd law?

A

Acceleration is proportional to the resultant force

9
Q

what is Newton’s 3rd law?

A

When two objects interact the forces they exert on each other are equal and opposite

10
Q

explain distance time graphs

A

-

11
Q

explain velocity time graphs

A

-

12
Q

equation for momentum

A

P= m x V

Momentum=mass x velocity

13
Q

equation for force

A

Force= change in momentum/time

14
Q

centripetal force

A
• a force which is moving in a circle
• travelling at a constant speed
• the velocity is constantly changing
15
Q

how to investigate motion

A

-

16
Q

stopping distance

A

The time it takes for something to stop eg. A car

It includes thinking distance and braking distance

17
Q

reaction time

A

The time it takes for someone to react

Things that affect your reaction time include tiredness,alcohol, drugs and distractions

18
Q

what are the factors that affect stopping distance?

A

•the condition of the brakes
worn or faulty

•the mass of the car
A full car won’t stop as quickly

•how much friction between tyres and the road
If the road is icy or wet

19
Q

what are the factors that affect reaction time?

A

-

20
Q

equation for energy in the car

A

-

21
Q

how to estimate the distances involved in stopping

A

-

22
Q

kinetic energy

A

Anything moving has energy in its kinetic energy store

23
Q

chemical energy

A

Anything that can release energy by a chemical reaction

24
Q

definition of gravitational potential energy

A

Anything in a gravitational field (ie.anything that can fall)

25
Q

elastic potential energy

A

Anything stretched, like springs, rubber bands etc

26
Q

equation for GPE

A

GPE= m x g x h

27
Q

equation for KE

A

KE= 0.5 x mass x (speed)²

28
Q

how can energy be transferred between stores

A
```In 4 main ways:
•mechanically
•electrically
•by heating
29
Q

equation for efficiency

A

-

30
Q

explain how to make the use of energy more efficient

A

-

31
Q

non-renewable energy

A
• will run out
• typically burnt to provide energy

Eg. Coal, oil and natural gas

32
Q

renewable energy

A
• won’t run out
• better for the environment
• may be unreliable or not provide as much energy

Eg.biofuels, wind, solar, hydro-electricity, tides

33
Q

give examples of non-renewable energy sources

A

-

34
Q

what affect does non-renewable energy sources have on the environment?

A

-

35
Q

Thermal energy

A

Any object- the hotter it is, the more energy it has in this store

36
Q

Electrostatic energy

A

Eg. Two charges that attract or repel each other

37
Q

Magnetic energy

A

Two magnets that attract or repel each other

38
Q

Nuclear energy

A

Atomic nuclei release energy from this store in nuclear reactions