Forces, energy and pressure

Question 1

Mass

Answer 1

Amount of stuff (atoms, molecules)in body.
Kilograms (Kg) or grams (g).
Using digital balance.
Mass never changes

Question 2

Weight

Answer 2

Pull of gravity acting in the body.
It is a force.
Measured In Newtons (N).
Using newton meter.

Question 3

Calculating weight

Answer 3

W=m x 10

Weight=mass x gravitational pull

Question 4

Susan mass is 55kg.

What weight is she?

Answer 4

W=m x 10
W=55 x 10
W=550N

Question 5

Force

Answer 5

Push or pull

Twist to turn

Question 6

Effects of force

Answer 6

Change shape of object
Change speed
Change direction of motion

Question 7

Force is measured using a…

Answer 7

Newton meter

Question 8

The unit of force is…..

Answer 8

Newton (N)

Question 9

What is friction

Answer 9

Force that opposes motion

Question 10

What force causes a bobsleigh to get faster going down a hill?

Answer 10

Gravity

Question 11

When does friction act

Answer 11

Two surfaces rub together

Question 12

How is friction reduced on bobsleighs

Answer 12

Polish them

Question 13

Air resistant position

Answer 13

Streamline

Question 14

Does friction cat backwards.

Answer 14

Yes

Question 15

What slows down aeroplanes

Answer 15

Air resistance drag

Question 16

What is a transducer

Answer 16

Something that can change energy from one form to another.

Represented as an energy chain.

Question 17

Falling stone

Answer 17

Kinetic➡️gravitational

Question 18

Electric iron

Answer 18

Electrical➡️heat

Question 19

Vacuum cleaner

Answer 19

Electrical➡️sound

Question 20

Electrical light

Answer 20

Light➡️heat

Question 21

Gravitational potential

Answer 21

Object gains weight when lifted higher.

Question 22

Elastic potential

Answer 22

Energy stored in a wound up, stretched spring

Question 23

Chemical

Answer 23

Energy stored in fuel, food and batteries

Question 24

Electrical

Answer 24

Carried with electrical current

Question 25

Kinetic

Answer 25

The energy an object has because it has been moving.

Question 26

Light

Answer 26

Allows us to see things around us

Question 27

Heat

Answer 27

Makes things warmer, melts solids and boils liquids

Question 28

Sound

Answer 28

Energy produced when an object vibrates-makes noise

Question 29

Nuclear

Answer 29

Energy with in an atom

Used in nuclear power stations

Question 30

What si energy measured in

Answer 30

Joules (J)

Kilojoules (KJ)

Question 31

How many joules in a kilojoules

Answer 31

1000 joules

Question 32

Four ways human beings need energy

Answer 32

Walking
Talking
Lifting
Writing

Question 33

A car is travelling 50 mph what does this mean?

Answer 33

This means that the car will travel 50 miles per hour.

Question 34

How to calculate average speed

Answer 34

Distance(m)➗Time(s)

Question 35

Do humans change forms of energy

Answer 35

Yes

Question 36

What happens if humans eat more than they burn

Answer 36

They become fat

Question 37

What happens if a human burns more energy than they eat

Answer 37

They will get tired easily

Question 38

When is friction useful in the car

Answer 38

Between tyre and road.
Holding the steering wheel.
Gear stick-holding.
Breaks.

Question 39

When is friction not helpful in a car

Answer 39

Air resistance.

Engine.

Question 40

In science what tells us how concentrated a force is.

Answer 40

Force

Area

Question 41

What is high pressure

Answer 41

Big force➕small area=high pressure.

Hammer=big force-pressing on a nail=small area.

Question 42

Low pressure

Answer 42

Weight spread over a large area=low pressure
Camel is heavier than boy but doesn’t sink into the sand because it’s feet are large and cover more area which means it is low pressure.