term 3

Question 1

Types of force

Answer 1

Contact forces exist between objects that are touching each other.
Non-contact (field) forces exist between objects that are not in contact.

Question 2

Effects of a force

Answer 2

Change motion – A force can cause an object at rest to begin moving. A force can also cause a moving object to stop. Forces can cause moving objects to speed up (accelerate) or slow down (decelerate).
Change direction – A force can cause a moving object to change direction.
Change shape – A force can deform an object.

Question 3

When we measure the strength of a force, we measure it in a unit called?

Answer 3

newtons

Question 4

Newton’s third law of motion

Answer 4

If object A exerts a force on object B, object B also exerts a force on object A. The forces will be equal in magnitude (strength), but opposite in direction.

Question 5

Action reaction pairs

Answer 5

Two forces that are equal in magnitude, but act in opposite directions according to Newton’s third law.

Question 6

Force is

Answer 6

a push or a pull. A force can cause motion, stop motion, change the direction of motion or change the shape of an object. Forces act in pairs and movement occurs when one of the two forces is stronger than the other.

Question 7

define: cell
battery
conductors wires

Answer 7

the source of energy for the circuit
2+ cells
made of metal

Question 8

define: fuze
bulb
buzzer

Answer 8

-a electrocal device that breaks the circuit when theres too much elctrical flow
-genrate heat and light
-converts electrical energy=sound energy

Question 9

define: switch
resistor
motor

Answer 9

-A switch controls the flow of current
-device that resists the flow of current
-converts electrical energy=mechanical energy

Question 10

define: conductor
insulator
free electrons

Answer 10

-A material that allows for the flow of current
-A material that doesn’t allow for the flow of current.
-electrons that are found in the atom’s outer shell

Question 11

define: Electrical resistance
Imbalance of electrical charge
current

Answer 11

-Opposes the passage of electrons
-This is when some part of an object has a different amount of free electrons than another part
-The flow of electrons through a conductor

Question 12

The Law of Conservation of electric charge

Answer 12

It means that you can never create a net electric charge. Instead, the charge can only move from one place to another.

Question 13

Examples of: conductors
insulators

Answer 13

->Silver
Copper
Aluminium
Iron
Carbon
Water
->Plastic
Wood
Paper
Glass

Question 14

Conventional current flows

Answer 14

from the positive terminal to the negative terminal of the cell.

Question 15

The resistance of an object is defined as voltage over current

Answer 15

R=V/I

Question 16

The Ohm Law states that:

Answer 16

The current flow through a conductor is directly proportional to the potential difference (voltage) and inversely proportional to the resistance.

Question 17

define: LED
LDR
Ohm
Incandescent
Rheostat

Answer 17

-Light-emitting diode
-Light-dependent resistor
- The unit of measurement used for resistance
-Emit light as a result of energy.
-A resistor with variable resistance.

Question 18

three field forces

Answer 18

Gravity
Magnetic force
Electrostatic force

Question 19

Law of universal gravitation

Answer 19

any object with mass exerts an attractive force on all other objects with mass.

Question 20

Gravity

Answer 20

A force that attracts all objects with mass towards the centre of another object that has mass.

Question 21

define: Attraction

         Repulsion

Answer 21

A force that pulls objects together.

A force that pushes objects away from each other.

Question 22

field

Answer 22

A field is an area in space where certain objects experience a force, irrespective of what other objects they are in contact with.

Question 23

weight

Answer 23

is the force by which the object is pulled down towards the centre of the Earth. Weight is a vector quantity as it has both magnitude and direction. Weight can be determined using a spring balance and it is measured in Newtons (N).

Question 24

mass

Answer 24

is the amount of matter composing an object. Mass is a scalar quantity which means it has magnitude but no direction. We can measure mass using a simple scale and it is measured in grams (g) or kilograms (kg).

Question 25

weight formula

Answer 25

W = m x g ‘m’, the mass of the object (in kilograms) by ‘g’, the gravitational force (in Newtons).

Question 26

Planet or solar body
Earth
Moon
Mercury

Answer 26

Gravitational acceleration in the solar system.
9.8
1.625
3.61

Question 27

Planet or solar body

Venus
Mars
Jupiter

Answer 27

Gravitational acceleration in the solar system

8.83
3.75
26

Question 28

Planet or solar body Acceleration

Saturn
Uranus
Neptune
Pluto

Answer 28

Gravitational acceleration in the solar system

11.2
10.5
13.3
0.61

Question 29

Explain the importance of magnetic fields

Answer 29

*Magnetic fields are crucial for Earth’s life, protecting it from cosmic radiation and charged particles from the Sun.
*They also serve as the basis for navigation using a compass and are essential for life on Earth.

Question 30

When drawing magnetic field lines

Answer 30

The magnetic field line should always begin from the north pole and move towards the
south pole

Question 31

magnets are ____ poles

Answer 31

dipoles south and north

Question 32

magnetic field

Answer 32

A magnetic field is an invisible space around a magnetic object that describes the distribution of magnetic force around it

Question 33

Articulate how lightning is an example of electrostatic forces.

Answer 33

Lightning is a natural phenomenon caused by electrostatic discharges between charged regions in the atmosphere, causing them to temporarily equalize when hitting an object on the ground.