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AQA GCSE Physics > 5 - Forces > Flashcards

5 - Forces Flashcards

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1
Q

What are the two types of quantity?

A

Vector and Scalar

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2
Q

What is a vector quantity?

A

A quantity that has both magnitude (size) and direction

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3
Q

What are some examples of vector quantities?

A

Force, velocity, displacement, acceleration

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4
Q

What is a scalar quantity?

A

A quantity with magnitude (size) but no direction

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5
Q

What are examples of scalar quantities?

A

Speed, distance, mass, temparature

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6
Q

How can vectors be represented?

A

Using arrows of varying length (to represent magnitude) and direction

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7
Q

What type of quantity is speed?

A

Scalar

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8
Q

What type of quantity is velocity?

A

Vector

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9
Q

What is a force?

A

A push or a pull that acts on an object due to interaction with another object

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10
Q

What are the two categories of forces?

A

Contact and non-contact

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11
Q

What are contact forces?

A

When the objects have to be touching for a force to act

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12
Q

What are some examples of contact forces?

A

Friction, air resistance, tension in rope etc

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13
Q

What are non-contact forces?

A

When objects do not need to be touching for the force to act

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14
Q

What are some examples of non-contact forces?

A

Magnetic force, gravitational force

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15
Q

What type of quantity is force?

A

Vector

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16
Q

When two objects interact, where are the forces acting?

A

On both objects

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17
Q

What is an interaction pair?

A

A pair of forces that are equal and opposite, and act on two interacting objects

18
Q

What is weight?

A

The force acting on an object due to gravity

19
Q

What does the weight of an object depend on?

A

The gravitational field strength at the point where the object is

20
Q

What is the unit used for weight?

A

newtons, N

21
Q

What is the unit used for gravitational field strength?

A

N/kg

22
Q

What is an object’s centre of mass?

A

The single point on which the weight of an object acts

23
Q

What is weight directly proportional to?

A

Mass

24
Q

What is weight measured using?

A

A calibrated spring-balance, also known as a newtonmeter

25
Q

What is a resultant force?

A

The single force that replaces a number of forces acting on an object, with the same effect as all the original forces acting together

26
Q

What can be used to represent a resultant force?

A

A free body diagram

27
Q

When can a single force be resolved into two components?

A

When the two components act at right angles to one another

28
Q

What can be used to resolve forces?

A

Vector diagrams

29
Q

What is work done?

A

When a force causes an object to move through a distance

30
Q

What are the units of work done?

A

J - joules

31
Q

What are the units of force?

A

N - newtons

32
Q

When is one joule of work done?

A

When a force of one newton causes a displacement of one metre

33
Q

What is 1 joule equal to?

A

1 newton-metre

34
Q

What causes the temperature of an object to rise?

A

Work done against the frictional forces acting on an object

35
Q

What is elastic deformation?

A

When an object can be deformed but will return to its original shape

36
Q

What is inelastic deformation?

A

When an object is deformed and does not return to its original shape - permanent

37
Q

What is extension directly proportional to?

A

The force applied

38
Q

What is the limit of proportionality?

A

The point at which an elastic object is stretched and no longer returns to its original shape

39
Q

What kind of energy is stored in a spring?

A

Elastic potential

40
Q

What are the units of the spring constant?

A

Newtons per metre (N/m)

41
Q

What happens in terms of force when a spring is extended or compressed?

A

Work is done

AQA GCSE Physics (9 decks)

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