Physical Sciences

Question 1

What is energy?

Answer 1

Energy makes things happen when it changes from one form to another.

Question 2

Name at least 3 different types of energy.

Answer 2

Heat energy, mechanical energy, nuclear energy, electrical energy, gravitational potential energy, sound energy, light energy and chemical energy.

Question 3

What are the 2 main groups of energy?

Answer 3

Potential energy (STORED) and kinetic energy (MOVEMENT).

Question 4

Name at least 3 types of kinetic energy.

Answer 4

Heat energy, sound energy, mechanical energy, light energy and electrical energy.

Question 5

Name at least 3 different types of potential energy.

Answer 5

Elastic energy, gravitational potential energy, nuclear energy and chemical energy.

Question 6

What is the measurement for mass in physics?

Answer 6

Kilograms.

Question 7

PE = MGH

What does each letter stand for in the formula above and what is the formula used for?

Answer 7

Mass (KG), Gravity (M/S/S), Height (M).

M x G x H = Potential energy of an object (Measured in Joules).

PE = Potential energy

Question 8

KE = 1/2 MV squared

What does this formula mean and what is it used to measure?

Answer 8

Half mass x velocity squared = kinetic energy of an object.

KE = Kinetic Energy

Measured in Joules.

Question 9

If a car was moving at 10 metres per second and weighs 1.65 Tonnes, what is it’s kinetic energy?

Answer 9

82500 Joules

Question 10

A large Boulder sits on the edge of a cliff. It weighs 500KG and the cliff is 1KM high. What is the boulder’s potential energy?

Answer 10

4900000 Joules.

Question 11

Define energy transformation.

Answer 11

The process of changing energy from one form to another.

Question 12

Describe the energy transformations in a solar cell.

Answer 12

Light energy - electrical energy.

Question 13

Define energy transfer and give an example.

Answer 13

The conversion of one form of energy into another, or the movement of energy from one place to another. Solar panels allow for energy transfer from light energy to heat and electrical energy.

Question 14

What is an energy converter and give 3 examples of energy converters?

Answer 14

A machine that changes energy forms to a different energy.

• Light Bulb
• Heater
• Radio

Question 15

Name the 3 different types of heat transfer.

Answer 15

Convection, conduction and radiation.

Question 16

How does conduction work?

Answer 16

More heat - more vibrations - more space - more collisions = heat spread.

Question 17

Why was the Berkeley-Ethiopia Stove made? (Give at least 3 examples).

Answer 17

• For more fuel efficiency
• To reduce harmful gas emissions
• To decrease women getting attacked

Question 18

Why is the Berkeley-Ethiopia especially important to women in the Darfur region of Sudan?

Answer 18

Not many trees because it is arid and dry meaning women have to walk further and have more chance to be attacked whilst they are getting firewood.

Question 19

How do you right joules?

Answer 19

j not J!!!

Question 20

What order do you write the formula for potential energy?

Answer 20

Mass (KG), Gravity (9.8 M/S/S), Height (METRES).

Question 21

What is energy transfer?

Answer 21

When energy is moved from one object to another, without changing form.

Question 21

Where does all energy ultimately come from?

Answer 21

The sun.

Question 22

What is the “Law of the Conservation of Energy”?

Answer 22

Energy cannot be created nor destroyed. It can only be transformed for one form to another.

Question 23

How does convection work?

Answer 23

More heat - more speed - more space - less dense = rise.

Less heat - less speed - less space - more dense = sink.

Question 24

What are some problems related to adopting the Berkeley-Ethiopia stove?

Answer 24

• People who are poor have to pay lots for the stove.
• Hard to transport stoves to remote areas or villages.
• Users need to be trained to use the stoves.

Question 25

Give 4 advantages related to the Berkley-Ethiopia stove.

Answer 25

• More fuel efficient.
• Produce less greenhouse gas emissions.
• Easily portable.
• Decrease of chances of small kids getting burnt by stoves.

Question 26

Give 4 disadvantages related to the Berkley-Ethiopia stove.

Answer 26

• Very expensive for poor people.
• Hard to get stoves to remote villages or areas.
• People who use the stove need to be trained which costs money.
• Women still have to collect wood and still have a chance of getting attacked.