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Physics Paper 2 > Topic P5, Forces > Flashcards

Topic P5, Forces Flashcards

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1
Q

What is a Vector Quantity?

A

Any quantity with magnitude and direction

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2
Q

What is a scalar quantity?

A

Any force with magnitude but no direction

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3
Q

What are the contact forces?

A

Friction
Air Resistance
Tension
Reaction Force

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4
Q

What are the non- contact forces?

A

Magnetic Force
Electrostatic Force
Gravitational Force

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5
Q

What does gravitational force do?

A

Attract 2 objects that have masses

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6
Q

What do magnetic forces do?

A

Attract or repulse, depends on the poles of the magnet

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7
Q

What is gravitational force?

A

The force of attraction between masses

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8
Q

What is mass?

A

The amount of “stuff” in an object

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9
Q

What is weight?

A

The force acting on an object due to gravity

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10
Q

What is mass measured in?

A

Kilograms (kg)

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11
Q

What is inertia?

A

the tendency for the motion of an object to remain unchanged

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12
Q

What is Newtons 1st law?

A

Newton’s first law states that
-if the resultant force of an object is 0:

  • if the object is stationary the object will remain stationary
    -if the object is moving, the object will continue to move at the same speed in the same direction ( the same velocity)
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13
Q

What is velocity?

A

The speed of an object in a given direction

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14
Q

What quantity is velocity?

A

A vector quantity

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15
Q

What is the typical speed of walking?

A

1.5 m/s

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16
Q

What is the typical speed of running?

A

3 m/s

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17
Q

What is the typical speed of cycling?

A

6 m/s

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18
Q

What is the typical speed of a car?

A

25 m/s

19
Q

What is the typical speed of a train?

A

55 m/s

20
Q

What is the typical speed of a plane?

A

250 m/s

21
Q

What is the typical speed of sound?

A

330 m/s

22
Q

What is speed?

A

How fast something is, no direction

23
Q

What quantity is speed?

A

Scalar quantity

24
Q

What does displacement do?

A

Displacement measures distance and direction in a straight line from an objects starting point to an objects finishing point

25
Q

What is distance?

A

How far an object moves

26
Q

What is meant by the term “work done”

A

When a force causes an object to move through a distance, work is done on an object

So a force does work on an object when then force causes a displacement of the object

27
Q

What is a non contact force?

A

A non-contact force is a force which acts on an object without coming physically in contact with it

28
Q

What is a contact force?

A

A contact force is a force where the objects are physically touching

29
Q

What can a vector quantity be represented by?

A

An arrow, the length of the arrow represents the magnitude, and the direction of the arrow represents the direction of the vector quantity

30
Q

Name me an example of a scalar quantity

A

Speed, distance, mass, time etc…

31
Q

Name me an example of a vector quantity

A

Force, velocity, displacement, acceleration

32
Q

Weight and mass are ________ proportional

A

Directly

33
Q

What does an objects “weight” depend on?

A

The gravitational field strength at the point where the object is

34
Q

What quantity is force?

A

Vector Quantity

35
Q

Newtons 2nd Law

A

Newtons 2nd law states that the acceleration of an object is proportional to the resultant force adding on the object, and inversely proportional to
the mass of the object

36
Q

According to Newtons 2nd law if a resultant force acts on an object, the object will ________. Finish the sentence

A

accelerate

37
Q

What does inertial mass measure?

A

How difficult it is to change the velocity of an object

38
Q

What is Newtons 3rd law?

A

When 2 objects interact, the forces they exert on each-over are equal in magnitude and opposite in direction

39
Q

What is stopping distance?

A

The stopping distance of a vehicle is the sum of the distance the vehicle travels during the drivers reaction time (thinking time) and the distance it travels under the breaking force (breaking time)

40
Q

If we increase the speed of a vehicle, what happens to the stopping distance

A

The stopping distance increases because the greater the speed, the longer the braking distance

41
Q

What can affect a drivers reaction time?

A

tiredness, drugs, alcohol, distractions

42
Q

What can affect the braking distance of a vehicle?

A

Adverse roads( wet /icy) weather conditions, poor vehicle conditions (tires/ breaks)

43
Q

Large decelerations may lead to ______ and or loss of ________ . Fill in the blanks

A

overheating, loss of control

44
Q

In a closed system, the goal momentum before an event is equal to the total momentum after the event, what is this called?

A

Conservation of momentum

Physics Paper 2 (1 decks)

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