Forces

Question 1

What is a force (1)

Answer 1

A force is a push or pull affect as a result of a reaction between objects.

Question 2

What is a force measured in(1)

Answer 2

The unit that force is measured in is called Newton (N)

Question 3

Who is Issac Newton (4)

Answer 3

• Isaac Newton was a English physicist in the 17th century.
• He is known as the most influential scientist.
• He formulated laws to declare the movement of objects.
• He had a great breakthrough in science.

Question 4

Discusse newtons first law of motion (4)

Answer 4

• A object that is in rest stays in rest.

- Object in motion stays in motion, -Unless an unbalanced force works in on it.

Question 5

Discusse newtons second law of motion (3)

Answer 5

-If a force is acted upon an object causes acceleration.
-The greater the mass is the greater the force is needed for acceleration.
-The formula is force = mass x acceleration
F = M space X a

Question 6

Name the three characteristics of force (3)

Answer 6

• All forces have an origin
• all are applied in a certain direction
• they all have an effect (visible/invisible)

Question 7

Discusse newtons third law of motion (3)

Answer 7

• Every action has a reaction
• that as equal in size
• and opposite in direction

Question 8

Force can’t be observed, but an ____ can (1)

Answer 8

Effect

Question 9

Name the seven effects of a force (7)

Answer 9

• Brings an object in rest to motion.
• Brings an object in motion to rest.
• Change the motion’s speed.
• Changes the motion’s acceleration.
• Changes the motion’s direction.
• Changes the objects shape.
• No visible effect

Question 10

What is a contact force (3)

Answer 10

• A force between two or one objects
• the surfaces is in direct contact with each other.
• It needs the surface or contact for acceleration.

Question 11

Name and describe the six types of contact forces (6)

Answer 11

Frictional:
Force acted upon when an object moves over another

Tension:
The force is transmitted through a string or a rope when pulled into the opposite direction

Normal:
A force acting upon a body that it is in contact with that is in rest

Air resistance:
Frictional force between an object and air.

Applied force:
A force applied by person onto an object where effect is visible

Spring Force:
The force applied by an outstretched or compressed spring on the object it is connected to

Question 12

What is a non-contact force and give examples (4)

Answer 12

The force applied without contact present. E.g.:

• Magnetism/ magnetic force
• Electrostatic force
• Gravitational force

Question 13

Define magnetism (4)

Answer 13

• Magnetism is the characteristics of iron, nickel, colbat
• and and alloy (a mixture of metals)
• to attract/repel and object.
• Amount of iron will determine the strength of the magnets.

Question 14

Define the poles of magnetism (3)

Answer 14

• most magnets have a south and north pole.
• If the same poles are facing eachother, they will repel
• the opposite poles are facing each other they will attract.

Question 15

Explain artificial/natural magnets (2)

Answer 15

• A magnet is either natural or artificial (man made).

- Lodestone is found in nature and has natural magnetic forces

Question 16

What are magnetic field(4)

Answer 16

• when an object exerts magnetic effect
• (attractions/repels)
• it will affect the objects in the area.
• It is indicated with magnetic field lines

Question 17

Why does the Earth have magnetic fields (3)

Answer 17

• The Earth has a large % of iron, therefore it has magnetic fields
• the iron is in liquid form
• there is a constant flow which causes the polls to shift.

Question 18

Explain the Earth’s to types of poles (4)

Answer 18

The Earth has geographic and magnetic poles

• the graphic is seen on the world map
• the magnetic Pole is determined by the iron in the Earth
• changes over long periods of time

Question 19

True or false: a magnet can only be in the shape of a ring (1)

Answer 19

False

Question 20

Explain attraction(2)

Answer 20

• Two magnets when held close to each other, exert a force on each other.
• Two opposite poles will exert attraction towards each other

Question 21

Explain repulsion (1)

Answer 21

Two similar poles will exert a force of repulsion on each other

Question 22

What is electrostatic force (9)

Answer 22

• All matter consist of protons (positive charge),
• neutrons (no charge)
• and electrons (negative charge).
• Electrostatic electricity is when the electrons from one atom moves to another.
• The one atom now has less protons than the other.
• This one will be positively charged.
• The other one has more electrons and protons.
• This one will be negatively charged.
• The opposite charges attract each other and the similar charges will repel each other.

Question 23

What is gravitational force (1)

Answer 23

The force with which two objects attract each other

Question 24

Name the two factors that determine the strength of gravitational force (2)

Answer 24

• The mass of the object in relation to the other

- the distance between the two objects

Question 25

Does only the Earth have gravitational properties (3)

Answer 25

• No, gravitational force is mostly known as the force that the Earth use to attract objects.
• However it can be the force between any two objects.
• The Earth is the only thing that is big enough to make an effect on objects.

Question 26

What is Newton and how is force measured (5)

Answer 26

• Neaton is the unit forces measured in.
• Weight = force, yet it is measured in kilograms.
• The direct link between two units are easily converted from one to the other.
• 1 kg = 9, 8066 capital N is equal to 10.
• If you weigh 40 kg the Earth exerts an attraction forces of 400 N on your body