Physics

Question 1

What is energy?

Answer 1

the ability to do work: that means make something happen.

Question 2

What is work?

Answer 2

moving an object by applying a force to it.

Question 3

What are energy and work done both measured in?

Answer 3

Joules (J)

Question 4

When do we use work?

Answer 4

when we use a force to move an object.

Question 5

When will work require more energy?

Answer 5

when we need to use a have a bigger force,

when we need to move the object further.

Question 6

What is the equation for work done?

Answer 6

Force (N) x Distance (M)= Work Done

Question 7

What are the 8 stores of energy?

Cats Take Every Meal Gratefully, Everyone Knows Now.

Answer 7

Chemical
Thermal
Elastic
Magnetic
Gravitational Potential
Electrostatic
Kinetic
Nuclear

Question 8

Name the stores energy can be transferred by.

Answer 8

electric
light
sound
mechanical (when a force acts on an object)

Question 9

What is the percentage efficiency equation?

Answer 9

Efficiency=Useful energy= Useful power
——————– ——————-
Total energy Total power

Question 10

How do you increase the efficiency?

Answer 10

The wasted energy transfer needs to be reduced with no change to the useful transfers

Question 11

What is the equation for kinetic energy?

Answer 11

Ek=0.5 x m x v squared

Question 12

What is the equation for GPE?

Answer 12

Egp = m x g x h

Question 13

What is the equation for power?

Answer 13

Power = Energy/ time

Question 14

What is the equation for weight?

Answer 14

Weight = Mass x gravity

Question 15

What are the 3 methods of heat transfer?

Answer 15

Conduction
Convection
Radiation

Question 16

Objects want to be in ____ so ____ energy will move until the temperature____ ____.

Answer 16

Equilibrium
thermal
balances out

Question 17

What temperature objects does thermal energy move from?

Answer 17

hot objects to cold objects

Question 18

What is conduction?

Answer 18

Heat transfer by molecular contact. Most effective in solids.

Question 19

What does heat cause molecules to do?

Answer 19

Vibrate

Question 20

What is convection?

Answer 20

Heat transfer through density differences. Effective in liquids and gases.

Question 21

Why does hot air rise?

Answer 21

Flames cause air to expand, becomes less dense.

Question 22

What is radiation?

Answer 22

Heat transfer by wave motion.

Question 23

How does energy travel from our sun to Earth?

Answer 23

Radiation

Question 24

Name a conductor.

Answer 24

a metal

Question 25

Name an Insulator.

Answer 25

anything other than a metal lol.

Question 26

How does conduction occur?

Answer 26

When particles begin to increase in energy they move more. When they collide with other particles in the material, they will pass on the energy.

Question 27

What makes a metal conductive?

Answer 27

delocalised electrons

Question 28

What is a delocalised electron?

Answer 28

Electrons that are free to move.

Question 29

What is the Law of conservation of energy?

Answer 29

Energy can Not be created or destroyed, it’s just transferred between stores.

Question 30

Name the stores energy can be transferred by.

Answer 30

electric
light
sound
mechanical (when a force acts on an object)

Question 31

ignore

Answer 31

ignore

Question 32

What is Radiation?

Answer 32

It is the emission of thermal energy.

Question 33

Do different colours affect the thermal energy of an object?

Answer 33

They can change how much thermal energy an object will absorb or emit.

Question 34

What is Specific Heat Capacity?

Answer 34

It is the energy required to increase the temperature of 1 kg of a substance by 1 degrees.

Question 35

What is meant by Thermal conductivity?

Answer 35

it is the rate of thermal energy transfer via conduction.