Chapter 3 : Forces and energy

Question 1

What is the time difference between high tide and low tide?

Answer 1

6 hours

Question 2

How long does it take for high tide to return to high tide?

Answer 2

12 hours

Question 3

What is mass?

Answer 3

Mass is the amount of matter in an object

Question 4

What is weight?

Answer 4

Weight is the amount of gravitational force on an object.

Question 5

What is weight measured in?

Answer 5

Newtons (N)

Question 6

What is mass measured in?

Answer 6

Kilograms (kg)

Question 7

What is the formula to find weight of different objects on Earth?

Answer 7

w = m x 10

Question 8

What is the formula to find the weight of different objects

Answer 8

w = m x g

Question 9

What is the order of the planets from the sun?

Answer 9

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

Question 10

All the planets follow a path of _________ around the sun

Answer 10

orbit

Question 11

What is a vacuum?

Answer 11

A space where there are no particles

Question 12

What is air resistance?

Answer 12

Air resistance is a force caused by moving objects having to push against the particles in the air.

Question 13

What is tidal range?

Answer 13

The difference in the depth of water between high tide and low tide.

Question 14

What is Earth tide?

Answer 14

Changes to the land in height due to the effect of tides.

Question 15

What is tidal force?

Answer 15

Tidal force is the pull from the moon’s gravity.

Question 16

What causes tides?

Answer 16

When the moon orbits the Earth, its gravity pulls the water towards it, causing the tide to rise.

Question 17

Does the sun produce a tidal force on Earth?

Answer 17

Yes.

Question 18

What are the effects of tides?

Answer 18

• Some harbours can only be used at a certain time of day.
• Costal areas are more likely to have flooding at times of high tide.
• Volcano eruptions have been linked with Earth tide
• Earthquakes have been linked with Earth tide

Question 19

What is energy?

Answer 19

Energy is something that needs to be changed or transferred in order to perform a function.

Question 20

What are all the different kinds of energy?

Answer 20

Electrical, kinetic, elastic potential, light, sound, thermal, chemical gravitational potential

Question 21

What is kinetic energy? Is it stored or transferred?

Answer 21

Kinetic energy is energy stored due to a movement of an object. Stored.

Question 22

What is chemical energy? Is it stored or transferred?

Answer 22

Chemical energy is energy stored in food, batteries and chemical fuels. Stored.

Question 23

What is thermal energy? Is it stored or transferred?

Answer 23

Thermal energy is energy stored in hot objects and transferred to colder objects. Can be stored or transferred.

Question 24

Is elastic potential energy stored or transferred?

Answer 24

Stored.

Question 25

Is gravitational potential energy stored or transferred?

Answer 25

Stored

Question 26

Is electrical energy stored or transferred?

Answer 26

Transferred

Question 27

Is light energy stored or transferred?

Answer 27

Transferred

Question 28

Is sound energy stored or transferred?

Answer 28

Transferred

Question 29

Can wasted energy be recovered? Why?

Answer 29

No. Wasted energy is dissipated and unable to be recovered.

Question 30

What does ‘dissipated’ mean?

Answer 30

To spread out and become less useful.