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Science > Forces page 112-122 > Flashcards

Forces page 112-122 Flashcards

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1
Q

What is a force?

A

A force is a push or a pull.

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2
Q

What is mass?

A

How much stuff something is made of.

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3
Q

What is gravity?

A

The force that makes something fall to the ground.

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4
Q

What are kilograms (Kg)

A

The units of mass.

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5
Q

What is weight?

A

The pull of Earth’s gravity on something.

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6
Q

What increases friction?

A

Rough surface
Large area
Moving in liquid
Moving fast

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7
Q

What decreases friction?

A 
Streamlined shape 
Smooth surface 
Moving slowly 
Small area 
Libration
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8
Q

What are tree things that forces do?

A

They push, pull or change the direction that objects re moving in, and change their shape.

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8
Q

What type of arrows show the direction and size of the force?

A

Force arrows show the direction and the size of the force.

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9
Q

What is contact force?

A

Contact force is when you are touching something.

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10
Q

What are tow types of contact forces?

A

Friction and air resistance are contact forces.

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11
Q

What are two types of non-contact forces?

A

Gravity and the force between magnets are both non-contact forces.

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12
Q

What happens to the tennis ball when gravity ‘acts’ on it?

A

The force of gravity acts on a tennis ball travelling through the air. The Earth pulls the ball down even though it is not touching it.

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13
Q

What are interaction pairs?

A

Interaction pairs are forces in pairs.

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14
Q

How do you measure forces?

A

You can measure force with a newton meter (sometimes called a spring balance). All forces are measured in newtons (N).

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15
Q

What happens when a ball hits the floor?

A

The ball deforms.

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16
Q

What can forces do to objects?

A

Forces can compress (squash) or stretch objects.

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17
Q

What happens when you exert force on an object?

A

When you exert force you can deform an object.

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18
Q

What two things can you do to an object?

A

You can compress an object or you can stretch an object.

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19
Q

What happens when you stand on the floor?

A

The floor pushes up on you when you stand on it.

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20
Q

What happens when you exert force on a solid object?

A

You compress the bonds when you exert force on an object.

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21
Q

What are the particles joined together by?

A

The particles are strongly joined together by bonds.

22
Q

What happens when you stand on the floor?

A

Your weight pushes the particles together.
The bonds are compressed.
They push back and supports you.

23
Q

What is a reaction force?

A

A support from a chair or the floor is called the reaction force.

24
Q

What objects stretch when you exert force on them and what is the amount that they stretch is called?

A

Bungee cords, springs and even lift cables all stretch when you exert a force on them. The amount that they stretch is called the extension.

25
Q

What is it called when the bungee cord has stretched as far as it will go?

A

Not only does the bungee cord pull her back up but also there is tension.

26
Q

What a happens if you ‘double’ the force on a spring?

A

If you ‘double’ the force on a spring the extension will ‘double.’

27
Q

What can you use to measure the size of the force exerted from the spring?

A

You can use the length of the spring to measure the size of the force.

28
Q

What happens when you remove the force?

A

When you remove the force the spring goes back to its original length.

29
Q

What does the elastic limit mean?

A

At some point the spring will not go back to its original length when you remove the force. This is called the elastic limit.

30
Q

What type of springs are designed to never go past there elastic limit?

A

Trampoline springs are designed to never go past their elastic limit.

31
Q

What happens to the shape of the bungee cord when you stretch it?

A

The shape of the bungee cord changes when you stretch the cord.

32
Q

What is Hooke’s Law?

A

If the extension doubles when you double the force then the object obeys Hooke’s Law.

33
Q

What does linear mean?

A

Liner means straight, it is normally used in graphs.

34
Q

What can friction do?

A

Frictions grips objects.

35
Q

How does friction help you to walk?

A

As the friction between your foot and the road produces the force to move you forward.

36
Q

How do the brakes work in a car and on a bike?

A

The brakes on your bike and in a car work because of friction.

37
Q

How can you reduce friction and what is it called?

A

One way to reduce friction is by using oil or grease. This is called lubrication.

38
Q

What do snowboarders do to reduce friction?

A

Snowboarders wax their boards to reduce friction between the board and the snow.

39
Q

What happens when you oil the chain of your bike?

A

The surfaces move sat each other more easily.

40
Q

What will both a dolphin swimming and a surfer paddling through the water experience?

A

They will both experience water resistance.

41
Q

What will a snowboarder experience when they jump through the air?

A

They will experience air resistance.

42
Q

What are both water resistance and air resistance called?

A

The are both called drag forces.

43
Q

What type of shape reduces drag forces?

A

A streamlined shape can reduce friction

44
Q

What type of object exerts a magnetic force?

A

Magnets exert a magnetic force on magnetic materials or other magnets without touching them.

45
Q

What is an electrostatic force?

A

An electrostatic force is when you rub a balloon you can pick pieces of paper with it.

46
Q

What are magnetic and electrostatic forces called?

A

They are called non-contact forces.

47
Q

What is force field in physics?

A

A region where something feels force.

48
Q

What are balanced forces?

A

Forces acting on an object that are the same size but act in opposite directions.

49
Q

What does equilibrium mean?

A

It means balanced.

50
Q

When forces are the same size what happens?

A

They cancel out.

51
Q

What happens if the forces are not the same size?

A

The forces don’t cancel out.

52
Q

What are unbalanced forces?

A

Opposing forces on an object that are unequal.

Science (15 decks)

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