Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Ns > Forces > Flashcards

Forces Flashcards

1
Q

Who is sir Isaac Newton

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Why is the unit forces named after sir Isaac Newton

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define force

A

An action that can be described as a push or pull

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What happens when we combine a push and pull force

A

Combining a push and pull force sometimes gives is a twist

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

When do we exert a force

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is forced measured in

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

2 ways force is described in?

A

By its direction and by its magnitude in newton’s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

List the 5 effects of forces

A
  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
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How do forces act and give 2 examples

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Define balanced forces and explain example

A

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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Define unbalanced forces

Which direction will the object move in if its unbalanced

and give example

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Define contact force

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Contact forces

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is friction force and explain example

A

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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

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

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Define Compresion

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Define non contact force

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the focus of field forces

A

Attraction and repulsion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Most common field forces are

A

Magnetic force
Gravitational force
Electric force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Most common field forces are

A

Magnetic force, gravataional force, electric force
Electric field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Field forces?

A

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

22
Q

Explain gravitational force

A

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

23
Q

Explain the relationship between mass and gravity

A

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.

24
Q

Explain the relationship with distance and gravity and explain example

A

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

25
Q

Explain mass and give an example

A

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

26
Q

Explain weight and give an example

A

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

27
Q

Explain gravitational acceleration.

A

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

28
Q

What is earth’s gravataional acceleration

A

9.8

29
Q

How do u calculate weight
And guve formular

A

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

30
Q

How do you convert grams to kilograms

A

Divide by 1000

31
Q

What is weight measured in

A

Newton’s

32
Q

What is magnets

A

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

33
Q

What do magnets have

A

Magnets have 2 poles a North and South pole.

34
Q

Magnetic materials

A

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

35
Q

What do magnets do and name them

A

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

36
Q

List 3 magnetic materials

A

Iron nickel and cobalt

37
Q

Explain alloys of magnetic materials and give and example

A

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

38
Q

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

A

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

39
Q

What are field lines for
How do field lines run

A
40
Q

What do oopiste poles do
What do like poles do
Example

A

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

41
Q

Electrostatic force

A

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

42
Q

What charge does a electron and proton have

A

Electron has a negative charge
Proton has a positive charge

43
Q

Explain the charge after :
Objects gain electrons
Objects loses electrons

A

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

44
Q

When is there an electrostatic force of attraction and repulsion

A

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

45
Q

How is lightning formed

A

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

46
Q

What is an electric cell

A

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

47
Q

Explain in a system diagram to represent a cell

A

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

48
Q

Fruit cell?

A

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

49
Q

What is voltage measured in

A

Voltage is measured in volts (v)

50
Q

What is the voltage also called

A

The potential differences across the terminals

51
Q

What does the voltage tell us

A

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

52
Q

What is batteries and name types

A

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

Ns (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions