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GCSE Physics Paper 2H (AQA) > Forces 1 > Flashcards

Forces 1 Flashcards

1
Q

What is a scalar quantity?

A

Magnitude (size).

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2
Q

What is a vector quantity?

A

Magnitude (size) and direction.

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3
Q

How might vectors quantities be represented with arrows?

A

The arrow length shows magnitude.

The arrow points in the direction that the vector quantity is acting.

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4
Q

What type of quantity are forces?

A

Vector.

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5
Q

When does a force occur?

A

When two or more objects interact.

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6
Q

What are contact forces?

A

Objects are actually touching.

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7
Q

What are examples of contact forces?

A 
Friction.
Air resistance/drag.
Tension.
Normal contact force.
Upthrust.
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8
Q

What are non-contact forces?

A

The objects are not touching.

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9
Q

What are examples of non-contact forces?

A

Gravitational force.
Electrostatic force.
Magnetic force.

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10
Q

What is gravity?

A

The force of attraction between all masses.

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11
Q

What is the gravity close to Earth due to?

A

The gravitational field around the planet.

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12
Q

What is the meaning of physics?

A

Pain.

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13
Q

What is weight?

A

The force acting on an object due to gravity.

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14
Q

How will physics be useful in everyday life?

A

To pass your exams. And beyond that…

Pain.

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15
Q

What does this symbol - ∝ - mean?

A

Two things are proportional.

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16
Q

How can weight be measured?

A

Using a newtonmeter.

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17
Q

What is resultant force?

A

If more than one forces are acting on an object, yet one of the forces is greater than the others, this force is seen as the only force acting on the object.

18
Q

What does a free body diagram show?

A

Different forces acting on an object.

19
Q

What do scale vector diagrams show?

A

The overall effect when more than one force acts on an object.

20
Q

What happens when a forces causes an object to move?

A

Work is done on that object, as it requires energy to move that object.

21
Q

What happens when work is done?

A

Energy transfers take place in the system.

For example, work is done to overcome friction, which causes energy to transfers into heat energy.

22
Q

What must happen for one to change the shape of an object?

A

More than one force must be applied.

23
Q

What shows that an object has been elastically deformed?

A

It returns to its original shape after forces have been removed.

24
Q

What shows that an object has been inelastically deformed?

A

It doesn’t return to its original shape after forces have been removed.

25
Q

What is the extension on an elastic object directly proportional to?

A

The applied force; the have a linear relationship and produce a straight line on a force-extension graph.

26
Q

What happens once the limit of proportionality has been exceeded?

A

Doubling the force will no longer exactly double the extension.
The relationship becomes non-linear.
A force-extension graph will stop becoming a straight line.

27
Q

What is the spring constant?

A

It indicates how easy it is to stretch or compress a string.

28
Q

What type of quantity is distance?

A

Scalar.

29
Q

What type of quantity is displacement?

A

Vector.

30
Q

What type of quantity is speed?

A

Scalar.

31
Q

What type of quantity is velocity?

A

Vector.

32
Q

What is velocity?

A

The speed of an object in a given direction.

33
Q

What happens if an object is travelling in a straight line?

A

It has a constant speed and a constant velocity.

34
Q

What happens if an object is moving in a circle?

A

It is constantly changing direction, and therefore velocity.

It is accelerating even though it is travelling at a constant speed.

35
Q

What is Newton’s first law?

A

An object will remain in the same state of motion unless acted on by an external force.

36
Q

What happens if the resultant force acting on an object is zero?

A

It continues to move at the same speed (stationary, otherwise), and the same direction.

37
Q

What is inertia?

A

The tendency for objects to continue in the same state of motion.

38
Q

What can a distance-time graph be used to represent?

A

The motion of an object travelling in a straight line.

39
Q

How might one find the speed on a distance-time graph?

A

By working out the gradient.

40
Q

What will a distance-time graph look like if an object is accelerating?

A

A curve.

GCSE Physics Paper 2H (AQA) (4 decks)

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