Test Revision 24-25 > Interactions > Flashcards

Interactions Flashcards

(76 cards)

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1
Q

What is a force?

A

A force is a push or pull acting on an object.

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2
Q

How many forces are acting directly against each other at any time?

A

2 (they act in pairs)

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3
Q

Are force pairs acting together or opposing each other?

A

Opposing one another.

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4
Q

Can you see a force?

A

No, but we can see the effect that it has on an object.

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5
Q

Can you touch a force?

A

No.

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6
Q

How can forces alter an object?

A

They can change an object’s speed, direction or even shape.

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7
Q

What is the difference between a contact and non contact force?

A

Contact forces must contact the object to apply but non-contact forces don’t have to.

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8
Q

Give an example of a contact force.

A

Friction

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9
Q

Give an example of a non-contact force.

A

Magnetism.

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10
Q

What is a pair of forces called?

A

An interaction pair.

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11
Q

What is the calculation for weight?

A

Mass x gravity = weight.

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12
Q

What are balanced forces?

A

Two forces acting upon 1 object that are equal in size, but work in opposite directions.

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13
Q

What happens to an object that isn’t moving when the forces on it are balanced?

A

If it isn’t moving, it stays still.

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14
Q

What happens to an object that is moving when balanced forces act on it?

A

It continues to move at the same speed, at a continuous rate in the same direction.

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15
Q

What are unbalanced forces?

A

When two forces acting on an object are not equal in size.

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16
Q

What happens to an object that isn’t moving when the forces on it are unbalanced?

A

It starts to move.

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17
Q

What happens to an object that is moving when unbalanced forces act on it?

A

The object that is moving changes speed or direction.

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18
Q

Is a bouncing ball a balanced or unbalanced force?

A

Unbalanced

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19
Q

Is a runner speeding up a balanced or unbalanced force?

A

Unbalanced

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20
Q

Is a person sitting on a chair a balanced or unbalanced force?

A

Balanced

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21
Q

Is a skydiver after just opening their parachute a balanced or unbalanced force?

A

Unbalanced

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22
Q

Is a parked car a balanced or unbalanced force?

A

Balanced

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23
Q

Is the moon orbiting the earth an example of a balanced or unbalanced force?

A

Balanced

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24
Q

What are forces measured in?

A

Newtons.

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25
What do you use to measure newtons?
A newton meter
26
What are the two ways you can use a newton meter?
You can hang an object by the newton meter or you can pull it at a continuous rate by the newton meter.
27
If someone pushes a box but it doesn’t move, what is an example of a force that might stop it from moving?
Friction
28
If someone bungee jumps, what is the force that makes them fall?
Weight
29
What is the name of the force that stops them hitting the ground?
Tension
30
How do forces change when a plane speeds up?
The thrust increase but the air resistance stays the same allowing the plane to move forward.
31
What is friction?
Friction is a force that acts when two objects rub against each other.
32
The smoother the object is, the ___ friction there is.
Less
33
The rougher the object is, the ___ friction there is.
More/ greater amount
34
Name three reasons why friction is good.
-We wouldn’t be able to sit on a chair without sliding off -We wouldn’t be able to stand up without falling over -We are able to press the brakes on your bike to slow you down (it uses friction against the wheel)
35
Name 3 reasons why friction is bad.
- it makes it harder to push things -it produces heat which can burn your hand or build up over time -it makes it more difficult to do things like skiing
36
The more weight there is, the ___ amount of force needed to pull it.
Larger/ greater
37
The less weight there is, the ___ amount of force needed to pull it.
Less
38
What is air resistance?
On earth, the air around us slows objects down as they have to push their way past all of the air molecules.
39
What 2 things is air resistance affected by?
The mass and surface area of an object.
40
What is a drag force?
A force that slows things down.
41
What kind of force is air resistance?
A drag force
42
Why is air resistance a drag force?
As an object moves through the air, it has to move the air particles out of the way before it can move into that space. The particles move around the object to fill the space behind it.
43
There is a force similar to air resistance that occurs with water molecules. What is it called?
Water resistance.
44
When your drawing force diagrams, what acronym can you use to help you remember?
Slop
45
What is the S in slop?
Size
46
What is the L in slop?
Label
47
What is the o in slop?
Orientation
48
What is the p in slop?
Position
49
What is streamlining?
When you reduce the force of air or water resistance on a moving object by making it a different shape.
50
What is another name for being streamlined?
Being aerodynamic
51
If something is streamlined, with it have more or less resistance to its movement?
Less
52
Will a streamlined vehicle mover faster or slower than one that isn’t streamlined?
Faster
53
In vehicles, what can streamlining also help save?
It will reduce the vehicles fuel consumption.
54
What is it called when you reduce the force of friction on an object?
Lubrication
55
What is lubrication?
When you make something smoother so that less friction acts upon it.
56
What can you use to make sure that surfaces move past each other easily.
Oil or wax
57
What do skiers do to their skis to reduce the friction between their skis and the snow?
They wax them.
58
What will a smaller surface area do to the levels of friction?
Reduce them
59
Skaters sharpen their skates so that what is reduced?
The area of metal in contact with the ice.
60
What do you need to know to work out the speed of something?
The distance it travelled (distance) and how long it took to travel that distance (time).
61
What are some common units that speed is measured in?
m/s, km/h and mph
62
What is m/s?
Metres per second
63
What is km/h
Kilometres per hour
64
What is mph?
Miles per hour
65
How do you calculate speed?
Distance / time = speed
66
How do you calculate time taken?
Distance / speed = time
67
How do you calculate the distance?
Speed x time = distance
68
What is another name for speed?
Velocity
69
What acronym can you use for equations in physics?
FIFA
70
What does the first F stand for in FIFA?
Formula- write out the equation
71
What does the I stand for in FIFA?
Insert- insert the values you know
72
What is the second F in FIFA?
Fine tune- rearrange the equation and convert it to the right units
73
What is the A in FIFA?
Answer- Calculate the answer, but don’t forget your units!
74
What is density?
Density is how tightly compressed the particles are.
75
No matter the density, what stays the same?
The size and number of particles
76
What changes, depending on the density
Test Revision 24-25
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