Ch 8 Forces In Action

Question 1

Contact Force

Answer 1

When one object comes in contact with another object
• Brushing your hair
•Hitting a golf ball
• kicking a soccer ball

Question 2

No Contact Force

Answer 2

The motion and shape or objects can be changed without touching anything.
• Dropping a tennis ball
• Dropping a pen
•Dropping a pencil

Question 3

Gravity

Answer 3

The force of gravity pulls down, Gravity is a non-contact force
Other types of non-contact force involve Magnetic force and electro static force.

Question 4

Permanent Magnets

Answer 4

Permanent magnets are magnets that retain their magnetism when removed from other magnets

Question 5

Temporary Magnets

Answer 5

Temporary Magnets are magnets that loose their magnetism when removed from another magnet

Question 6

Repulsion

Answer 6

An opposing force

Question 7

Attraction

Answer 7

The force of which one object is attracted, connected or has interest to one another

Question 8

Magnetic Fields

Answer 8

Magnetic fields are the areas where the magnetic force acts

Question 9

Force

Answer 9

A force is a push or pull in a particular direction they are occurring around us all the time
• opening a door
• opening a jar
• opening and closing a pencil case

Question 10

Domains

Answer 10

Mini magnets inside a magnet that make the magnet magnetised if the domains are lined up, and facing the same way. If domains are mixed up the magnet will not be magnetised

Question 11

Electromagnet

Answer 11

An electromagnet is a non-magnetised piece of iron that has a coil of insulated wire around it.

Question 12

Atoms

Answer 12

A very small particle that makes up all things

Question 13

Nucleus

Answer 13

Roundish structure inside cells that acts as a control centre for the cell

Question 14

Electrons

Answer 14

Very light, negatively charged particles inside an atom

Question 15

Negative electric charge

Answer 15

The charge on an atom or object with more electrons than protons

Question 16

Protons

Answer 16

Tiny, but heavy particle found in the nucleus of an atom

Question 17

Positive electric charge

Answer 17

The charge on an object or atom with fewer electrons that’s protons

Question 18

Neutrons

Answer 18

Tiny, but heavy particles found in the nucleus of an atom

Question 19

Neutral

Answer 19

Having the same amount of protons and neutrons

Question 20

Static Electricity

Answer 20

A build up of charge in one place

Question 21

Insulators

Answer 21

Materials that do not allow electric charge to flow through them

Question 22

Conductors

Answer 22

Materials that allow electric charge to flow through them

Question 23

Lightning Rods

Answer 23

Conductive Metal rod, that is often tied to the top of tall buildings. Lightning rods help to keep buildings safe from lightning strikes.

Question 24

Mass

Answer 24

A measure of the amount of material in an object of substance

Question 25

Weight

Answer 25

a measure of the size of the gravity force pulling an object towards the centre of a massive body, such as the Earth. The weight of an object depends on the object’s mass

Question 26

Newton

Answer 26

The unit for measuring forces

Question 27

Air Resistance

Answer 27

the force of air pushing on an object as the object moves through the air

Question 28

Terminal speed

Answer 28

the constant speed reached by a falling body. A body reaches terminal speed when the force of gravity pulling it down is balanced by the air resistance pushing against it

Question 29

Friction

Answer 29

A force that is applied to the surface of an object when it moves against the surface of another object

Question 30

Traction

Answer 30

A type of friction used to assist movement

Question 31

Lubricants

Answer 31

Substance with large particles that can slide easily over each other.

Question 32

Fluid

Answer 32

A substance that flows and has no fixed shape

Question 33

streamlined

Answer 33

Shaped so that drag through a fluid is minimised

Question 34

Buoyancy

Answer 34

A force. Which keeps objects floating

Question 35

Surface Tension

Answer 35

he ‘firmness’ of the surface of a liquid created by the attraction between particles at the surface.