Forces

Question 1

Who is sir Isaac Newton

Answer 1

Sir Isaac Newton is an English physicist and mathematician and he’s recognized as the most influential scientist of all time

Question 2

Why is the unit forces named after sir Isaac Newton

Answer 2

The unit Force is named after him in the recognition of his work in mechanics and his 3 laws of motion

Question 3

Define force

Answer 3

An action that can be described as a push or pull

Question 4

What happens when we combine a push and pull force

Answer 4

Combining a push and pull force sometimes gives is a twist

Question 5

When do we exert a force

Answer 5

We exert a force when we push or pull or use a twist to change the shape, direction or speed of an object.

Question 6

What is forced measured in

Answer 6

Forced is measured in Newton after sir Isaac Newton and it’s abbreviated N

Question 7

2 ways force is described in?

Answer 7

By its direction and by its magnitude in newton’s

Question 8

List the 5 effects of forces

Answer 8

1. A force can cause an object to move eg a pushing or pulling force to move a car.
   2.a force can cause an object to move faster or slow down or stop eg the force that breaks exert to slow down the taxi.
   3.a force can cause an object to change direction eg the dog exerts a pulling force on its leash that makes the girl change direction.
2. A force can cause an object to change shape(deformation? Eg exerting a twisting force to dry a sponge.
   5.a force can cause an object to rotate

Question 9

How do forces act and give 2 examples

Answer 9

Forces act in pairs and forces act in opposite direction.
Eg. If you push against the wall the wall will push back against you
A book on the table pushes down on the table and the table will push back up against the book

Question 10

Define balanced forces and explain example

Answer 10

When two forces are exerted in opposite directions and the objects remain stationary
Example… Wall is 30N and person is 30N
30N-30N therefore both objects are stationary.

Question 11

Define unbalanced forces

Which direction will the object move in if its unbalanced

and give example

Answer 11

When one force is greater or smaller than the other and the objects move.
The object will move in the direction of the greater force with the magnitude of the resultant force

Example… 50N-30N =30N To the right

Question 12

Define contact force

Answer 12

When objects are in contact with each other and exert force on one another

Question 13

Contact forces

Answer 13

Applied force, spring force, drag force, friction force, normal force.

Question 14

What is friction force and explain example

Answer 14

A force that opposes motion.
Frictional force always acts in the opposite direction to which the objects move.
Friction resist movement when the object and surface are in contact.

Question 15

Define tension and examples….
What happens if tension is increased

Answer 15

A contact force in a rope or cable when it is used to carry a load.
Examples :
If you pull a rope which is pulling a box there is tension in the rope.
Hanging something on a rope from the celing.
Some materials stretch if tension is increased. Eg elastic band

Question 16

Define Compresion

Answer 16

A contact force that pushes or swueezes something into a smaller space or another space

Eg when you squeeze a blown up balloon a little between your hands it becomes smaller because you are pushing the air particles inside the Ballon closer

Question 17

Define non contact force

Answer 17

When objects are not in contact with each other but still exert forces on one another

Question 18

What is the focus of field forces

Answer 18

Attraction and repulsion

Question 19

Most common field forces are

Answer 19

Magnetic force
Gravitational force
Electric force

Question 20

Most common field forces are

Answer 20

Magnetic force, gravataional force, electric force
Electric field

Question 21

Field forces?

Answer 21

Field forces is also non contact forces.
They act over a distance

Question 22

Explain gravitational force

Answer 22

The force that causes things to fall down towards the earth and prevents people from falling of the planet is the gravitational force.
Gravitational force exist between 2 objects with mass and they are forces of attraction.
Any object with a mass exerts a gravitational force on any other object with mass.
The earth’s gravataional force force pulls everything towards the center of the earth which is why when you drop a apple it falls to the ground

Question 23

Explain the relationship between mass and gravity

Answer 23

BMGF- bigger mass greater force.
The bigger the mass of any object the greater the force between them.
This means that 2 small objects will have a weak gravitational attraction and so it has no noticeable effects
But bigger objects such as the earth and the moon will have a much greater gravataional force.

Question 24

Explain the relationship with distance and gravity and explain example

Answer 24

The gravataional force that two objects exerts on each other becomes smaller if they are further apart.

Eg if i move away from the wall the gravataional force the wall exerts on me becomes smaller

Question 25

Explain mass and give an example

Answer 25

MKGS- mass is measures in kilograms and stays the same. Mass of an object tells us how much matter the object has it tells us how much particles you have. Eg a wooden block with a mass of 10 kg on earth will have a mass of 10kg on the moon

Question 26

Explain weight and give an example

Answer 26

WNC- weight is measured in newton's and changes. Weight will change depending on the objects mass and the streghtg of gravataional force acting on it. Eg the weight of a 10kg blok on earth will be different on the moon

Question 27

Explain gravitational acceleration.

Answer 27

Earth the gravataional force causes us all to accelerate towards the center of the earth. This acceleration is called gravataional acceleration. Objects are free fall when the only force acting on them is the gravataional force

Question 28

What is earth's gravataional acceleration

Answer 28

9.8

Question 29

How do u calculate weight And guve formular

Answer 29

To calculate weight (W) you multiple the mass(M) by the gravataional acceleration (g) W(N) =M(KG) ×G(9.8)

Question 30

How do you convert grams to kilograms

Answer 30

Divide by 1000

Question 31

What is weight measured in

Answer 31

Newton's

Question 32

What is magnets

Answer 32

Certain materials have strong magnetic fields around them this is called magnets

Question 33

What do magnets have

Answer 33

Magnets have 2 poles a North and South pole.

Question 34

Magnetic materials

Answer 34

Other materials are strongly attracted to magnets this is said to be magnetic materials

Question 35

What do magnets do and name them

Answer 35

Magnets exert forces on other magnets or materials A force of attraction A force of repulsion

Question 36

List 3 magnetic materials

Answer 36

Iron nickel and cobalt

Question 37

Explain alloys of magnetic materials and give and example

Answer 37

Alloys that include any of the magnetic materials can also be attracted to a magnet Steel is an alloy that contains iron so it can be attracted to a magnet

Question 38

Magnetic force fields explain Does magnetic force field act over a distance? Explain field

Answer 38

It is possible to visualize the nagnetic force field around a magnet by using iron fillings. Yes. Magnetic force acts over a distance The field is the space around a magnet in which it can attract or repel

Question 39

What are field lines for How do field lines run

Question 40

What do oopiste poles do What do like poles do Example

Answer 40

Opposite poles attract n and s attract Like oples repel n and n repel S and s repel

Question 41

Electrostatic force

Answer 41

When certain materials are rubbed together the friction between them causes the electrons to go from one material to another. The object then has an electrostatic charge due to either the gain or loss of electrons

Question 42

What charge does a electron and proton have

Answer 42

Electron has a negative charge Proton has a positive charge

Question 43

Explain the charge after : Objects gain electrons Objects loses electrons

Answer 43

Objects gain electrons carry a negative charge Object loses electrons carry a positive charge

Question 44

When is there an electrostatic force of attraction and repulsion

Answer 44

There is an electrostatic force between objects with opposite charges and repulsion between objects with like charges

Question 45

How is lightning formed

Answer 45

The movement of air inside thunder clouds creates friction between water and air particles this causes the clouds to become positively charged in the top and negatively charged towards the bottom. The negative bottom of the cloud pushes negative charges on the surface of the earth way the ground becomes positively charged

Question 46

What is an electric cell

Answer 46

An electric cell is a system in which chemical energy is converted into electrical energy

Question 47

Explain in a system diagram to represent a cell

Answer 47

Input-chemical energy stored in materials that cell is made of Process-chemical reaction that takes place inside a cell and releases electrons. Output-electricity available to external circuit

Question 48

Fruit cell?

Answer 48

An acidic fruit can be used to construct a simple cell the lemon juice ascts as the electrolyte

Question 49

What is voltage measured in

Answer 49

Voltage is measured in volts (v)

Question 50

What is the voltage also called

Answer 50

The potential differences across the terminals

Question 51

What does the voltage tell us

Answer 51

The voltage tells us how much energy a cell can provide to push a certain amount of electrons through a circuit.

Question 52

What is batteries and name types

Answer 52

More than 2 cell connected together Zinc-carbon Nickel-cadmium