Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Natural Sciences > Forces > Flashcards

Forces Flashcards

1
Q

What is a force

A

It is a pull or push
A force cannot be seen, but the effect of it can be

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What unit is force measured in

A

Force is measured in the Newton force can be measured with a spring balance or scale

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Name all the different types of forces

A

Contact
field
gravitational
electrostatic
magnetic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What can happen if forces exerted on an object

A

Speeding up or slowing down deformation
rotation
Direction changes
object comes to a standstill

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are paired forces

A

Each object exerts a force of equal magnitude on the other object

the two forces are in opposite directions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

non-contact or Field forces

A

These are forces that act over a Distance (action - over - a - distance.)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Contact forces

A

Forces that happen when an object touches another object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Name three examples of non-contact or Field forces

A

1 gravitational force
2 magnetic force
3 electrostatic Force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Name examples of contact forces

A

1 mechanical Force
2 applied force
3 friction Force
4 normal Force
5 tension force or tension
6 resistance
7 elastic forces in Springs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is gravitational force and what are some examples of objects that attract each other

A

This is when objects attract each other without touching
the sun and the planet

the Earth and the Moon

the Earth and objects on the earth’s surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is mass

A

Mass is the amount of matter an object has
Mass is measured in kilograms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is weight

A

Weight is the force an object exerts on another object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Explain magnetic forces

A

Magnets attract object that consists of iron, nickel or cobalt
if a material contains one of these properties it has magnetic properties

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What do atoms consist of

A

Protons which is the positive charge and neutrons which is the Neutral charge both of these are in the nucleus
electrons are the negative charge and they occupy the space around the nucleus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Explain what an electrostatic force is

A

A force that charged object exert

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

When is an object negatively charged and when is it positively charged

A

An object is positively charged when it gives electrons away
and
it is negatively charged when it accepts electrons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is needed for electrostatic forces to happen

A

Friction is needed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

How do you charge an item

A

You can rub it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

How is lightning formed

A

Particles and droplets in clouds rub and bump into each other and become charged
and
go to the bottom of clouds and transfer energy into the Earth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is lightning

A

A massive spark of electricity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Some safety measures during lightning

A

1 avoid outdoor activities in bad weather
2 Take Shelter inside a building or vehicle
3 avoid trees, carports, convertible cars, motorbikes, Towers, fences, telephone poles and power lines
4 avoid using telephones and other electrical apparatus
5 don’t bath or shower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What are some safety measures if you are outside without shelter nearby

A

1 make your body size the smallest possible by squatting and putting your head between your knees
2 do not lie on the ground as the current can move through the ground and slow through your body
3 avoid trees fences and poles
4 if you are on a dam try to get to dry land as soon as possible and seek shelter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Name some facts about paired forces

A

They are always equal in magnitude

they act in opposite direction

act simultaneously on two different objects

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the formula for calculating weight

A

Fg= W = mg

Fg = w represents weight in newtons

m represent mass in kgs

G represent gravitational acceleration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What are electrical cells

A

Cells are a source of electrical energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What is a battery

A

More than one cell that are connected

27
Q

Series circuit

A

The positive pole of one cell is connected to the negative pole of the following cell

28
Q

Parallel circuit

A

This is a circuit which has more than one pathway for current

and

all the negatives poles are connected to one end and all the positive poles to the other end

29
Q

What does a cell consist of

A

An electrolyte which contains positive and negative particles called ions and metal rods which serve as poles

30
Q

What is an electrolyte

A

It is a solution which produces electricity

31
Q

What are conductors

A

Substances that conduct an electrical current
and
offer a little resistance against the flow of charge
examples are copper,silver and iron.

32
Q

What is a resistor

A

It is the component in a circuit that can control the energy transfer and the current and convert it into useful forms
Resistors are also known as poor conductors

33
Q

What is resistance measured in

A

It is measured in ohm

34
Q

What is the use of resistors

A

It takes flow in and collides the charges against the particles of the resistor and part of the electrical energy will be transferred to the particles of the resistor during the collision and the resistor will use this energy and converted it to heat, light or sound energy

35
Q

What are the factors affecting/influencing resistance

A

The type of conductor
Set metals have less or more resistance than others for example
Copper golden silver have low resistance
whereas
tungsten nickel and chrome have high resistance

the length of conductor
The longer a conductor in the greater the resistance

thickness of conductor
The thicker a conductor the smaller that resistance

temperature
the hotter a conductor the greater the resistance

36
Q

What is electrical current

A

It is charge(electrons) that flow

37
Q

What is conventional current

A

Directions current is from the positive pole of the battery, through the circuit to the negative Pole

38
Q

What is required for current to flow

A

A source of energy and a the circuit must be closed

39
Q

What is the symbol for current and what is current measured with and what is the unit of measurement

A

The symbol for current design current is measured with an ammeter and the unit of measurement is ampere

40
Q

Name two facts about an ammeter

A

An ammeter is always connected in series and has low resistance

41
Q

What is potential difference and what is it measured in and with

A

Potential difference is the difference in potential energy over 2 points

it is measured with a voltmeter which is connected in parallel over a resistor or a cell/battery

unit is volts V

42
Q

What are some effects of resistors

A

The total current of a sales/battery increases with each resistor being added in parallel

43
Q

What two wires are connected to a household electricity meter

A

A neutral and a live wire

44
Q

What measures how much energy is used in the household

A

The electricity meter

45
Q

What does Earthed mean

A

Means that it is connected to the ground by a metal wire slash pipe

46
Q

A 3 pin-plug has three wires what are the colors of those wire

A

There’s a brown live wire
a blue neutral wire
a striped yellow and green Earth wire

47
Q

What is a fuse

A

A fuse is a small piece of metal that melts when there’s an overload and interrupts current so it cannot flow anymore

48
Q

What is a circuit breaker

A

A circuit breaker is a switch(electromagnet) that trips as soon as the current becomes too large and the current is interrupted

49
Q

Name the disadvantage and advantage of a fuse

A

A disadvantage of fuses that it has to be replaced and an advantage of a it is that it is cheap and easily available

50
Q

Name the disadvantages and advantage of a circuit breaker

A

The disadvantage of a circuit breaker is that is expensive and the advantage of a circuit breaker is that it can just be switched on again

51
Q

What is a lightning conductor

A

It is a metal rod with a shop end that is fixed to roofs/high points and another point that is planted into the ground it can also be connected to copper wire that is in the ground

52
Q

What is the function of a lightning conductor

A

Charge of the lightning is concentrated on the shop point the charge is then conducting into the ground through the lightning conductor and copper wire with a lightning conductor a building or structure is Earthed

53
Q

In what ways does electricity theft take place

A

Illegal connections
Fiddling with electricity meters
cable theft

54
Q

Effects of electricity theft

A

Stability and qualities is influenced

can lead to power interruptions

Eskom cannot keep up with the increase in demand to provide electricity

big financial losses

people and animals can be shocked to death or seriously hurt

55
Q

What is eskom responsible for

A

Generating electricity

transmission of electricity over long distance

distribution to the consumer

56
Q

Benefits of nuclear power stations

A

There is little pollution

Constantly available

Safe if measures are followed

Effective electricity supply

57
Q

Disadvantages of nuclear power

A

Danger of pollution if it is not strictly managed

relatively short lifespan of reactors danger of radiation

dangers of dumping of Radioactive waste

Limited dumping sites for waste

58
Q

What are the units of measurements for energy time and transfer of electrical energy

A

Energy is Joules (J)

Time is seconds (s)

Transfer of electrical energy is watt(w)

59
Q

What is measured in kilowatt

A

The amount of energy transferred

60
Q

What is the formula for calculating the transfer of energy

A

P=VI

P-transfer of energy
V-is for potential difference which is a measured in volts
I is for current which is measured in

61
Q

What does the formula for calculating the cost of energy

A

Cost of energy = kWhoursunit price

62
Q

How many Watts are equal to a kilowattt

A

1,000 Watts is equals 1 kW

63
Q

How many Joules are equal to a kilojoule

A

1000 Joules = 1 Kilojouled

64
Q

In what unit is electric energy sold

A

Kilowatt hour (kWh)

Natural Sciences (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions