Science - Energy & Forces

Question 1

What is the definiton of energy?

Answer 1

The ability to do work

Question 2

Name an energy transformation that occurs when you use a microwave

Answer 2

Electrical -> Chemical or Mechanical -> Light, Heat, Sound

Question 3

Name some types of Energy

Answer 3

• potential,
• kinetic (motion),
• chemical,
• elastic,
• electrical, -
• thermal/heat,
• sound,
• light
• gravitational potential energy

Question 4

What unit is Energy measured by?

Answer 4

Joules/KiloJoules

Question 5

What is the Law of Conservation of Energy

Answer 5

Energy cannot be created nor destroyed

Question 6

What do we use to measure force?

Answer 6

Newton (N)

Question 7

What is Friction?

Answer 7

Friction is an opposing force when two objects are in contact

Question 8

What is a force?

Answer 8

A force is a push or a pull that occurs when two objects interact.

Question 9

What is Energy Efficiency?

Answer 9

Energy Efficiency is the energy amount of energy inputted into an object compared to the useful energy outcome of an object.

Question 10

What is the calculation for Energy Effeciency?

Answer 10

Efficiencey= Useful Energy output
—————————— x 100
Total Energy Input

Question 11

What does energy does friction cause?

Answer 11

Heat

Question 12

What is magnetism?

Answer 12

The force exerted by magnets that attract or repel other magnets

Question 13

What is the resultant/net force?

Answer 13

The total amount and difference between measurement in forces.

Question 14

What are balanced Forces

Answer 14

Balanced Forces are two equal forces in size and opposite in direction

Question 15

What are unbalanced forces?

Answer 15

Unbalanced forces are two or more forces, unequal in zie and direction

Question 16

What are magnetic fields?

Answer 16

Magnetic fields are invisible lines of force.

Question 17

What do Like poles of magnets do?

Answer 17

Repel

Question 17

What materials are natural magnets?

Answer 17

Iron, Nickel, Cobalt

Question 18

What do opposite poles of magnets do?

Answer 18

Attract

Question 19

What is gravity?

Answer 19

Gravity is an attractive force acting between objects that have mass.

Question 20

What are some examples of technological developments that
have contributed to finding solutions to reduce the impact of
forces in everyday life?

Answer 20

Seatbelt, Airbags, Shock absorbers, Crumple zones in cars, Helmets, etc.

Question 21

What is mass?

Answer 21

The amount of substance in an object

Question 22

Does Mass change?

Answer 22

No

Question 23

What is the unit of mass?

Answer 23

Kg

Question 24

What is weight?

Answer 24

Is the force of gravity (g) acting on the object

Question 25

Does Weight change?

Answer 25

Yes weight changes from place to place.

Question 26

What is the unit of weight?

Answer 26

Newtons (N)

Question 27

How do you calculate Weight?

Answer 27

W = Mass(m) x Gravity(g)
W= mxg
W= mg

Question 28

Will my mass be higher on the moon than the earth?

Answer 28

No it will be the same

Question 29

Will my weight be higher on Jupiter than Earth

Answer 29

Yes because the amount of gravity increases.

Question 30

What is buoyancy force?

Answer 30

A force that makes you float

Question 31

What is applied Force?

Answer 31

A force that occurs when you apply force to an object like a push or a pull.