Science Forces and energy

Question 1

What is energy?

Answer 1

The ability to do work

Question 2

What is the law of conservation of energy

Answer 2

Energy can’t be created or destroyed, it can only be transformed

Question 3

What is potential energy

Answer 3

Energy due to its position

Question 4

What is kinetic energy

Answer 4

Energy to its motion

Question 5

What are 3 types of kinetic energy

Answer 5

Heat, sound and light energy

Question 6

What is heat energy

Answer 6

Found in hot objects

Question 7

What is sound energy

Answer 7

Air particles in the form of a wave to your ear

Question 8

What is light energy

Answer 8

Travels from source to your eye

Question 9

What is electrical energy

Answer 9

The flow of tiny particles called electrons

Question 10

What are 3 types of potential energy

Answer 10

Gravitational, elastic and chemical energy

Question 11

What is gravitational potential energy

Answer 11

An object experiencing gravity; every object on earth has GPE because everything is attracted to the earth’s centre

Question 12

What is elastic potential energy

Answer 12

Energy gained when objects are stretched

Question 13

What is chemical potential energy

Answer 13

Energy stored when atoms and molecules bond, can be found in food

Question 14

What is efficiency

Answer 14

Term to describe how well it does its job and how little energy is required to do that job

Question 15

How do you find efficiency

Answer 15

Efficiency = useful energy output (j) divided by total energy input (j)
x 100

Question 16

What is the input energy of a lightbulb

Answer 16

Electrical

Question 17

What is the useful energy of a lightbulb

Answer 17

Light

Question 18

What is the waste energy of a lightbulb

Answer 18

Heat

Question 19

What are forces

Answer 19

A push or pull when two objects interact

Question 20

What are the 2 types of forces

Answer 20

Contact and non-contact

Question 21

What are balanced forces

Answer 21

2 forces equal in size but opposite in direction

Question 22

What are unbalanced forces

Answer 22

2 or more forces unequal in size and direction

Question 23

What are the forces in a pile of books on a table

Answer 23

Normal force and weight

Question 24

What are the forces in a boy kicking a ball

Answer 24

Applied force, normal force, weight, friction

Question 25

What are the forces in a moving bicycle

Answer 25

Normal force, drag (air resistance), gravity, friction and applied force

Question 26

What is an example of a contact force

Answer 26

Friction

Question 27

What are 3 examples of non-contact forces

Answer 27

Electrical, gravitational and magnetic force

Question 28

What are spring balances used for

Answer 28

To measure the amount of force (Newton)

Question 29

What is friction

Answer 29

An opposing force when 2 objects are in contact eg car tyres plus road

Question 30

What is magnetism

Answer 30

The force exerted by magnets when they attract or repel each other.

Question 31

What is the definition of mass

Answer 31

The amount of substance in an object (mass always stays the same); unit always kg

Question 32

What is weight

Answer 32

The force of gravity acting in an object (weight changes from place to place); unit always Newton

Question 33

What is gravity

Answer 33

An attractive force acting between 2 objects that have mass

Question 34

What is the formula for finding weight

Answer 34

W=M x G (M=mass; G=gravity)

Question 35

What is static electricity

Answer 35

The result of an imbalance between negative and positive charges in an object