Topic 5 - Forces (Without pressure or momentum)

0.0(0)
studied byStudied by 0 people
learnLearn
examPractice Test
spaced repetitionSpaced Repetition
heart puzzleMatch
flashcardsFlashcards
Card Sorting

1/53

encourage image

There's no tags or description

Looks like no tags are added yet.

Study Analytics
Name
Mastery
Learn
Test
Matching
Spaced

No study sessions yet.

54 Terms

1
New cards

What are vectors?

Vector quantities have a magnitude and direction

2
New cards

Examples of vector quantities?

  1. Force

  2. Velocity

  3. Displacement

  4. Acceleration

  5. Momentum

3
New cards

What are scalar quantities?

Have a magnitude but no direction

4
New cards

Examples of scalat quatities?

  1. Speed

  2. Distance

  3. Mass

  4. Temperature

  5. Time

5
New cards

What is a force?

Is a push or pull on an object that is caused by it interacting with something

6
New cards

What is a contact force?

When 2 objects have to be touching for a force to act

7
New cards

Examples of contact forces?

  1. friction

  2. tension in ropes

  3. normal contact force

  4. air resistance

8
New cards

What are non contact forces?

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

9
New cards

Examples of non-contact forces?

  1. Magnetic force

  2. Gravitational force

  3. Electrostatic force

10
New cards

What is mass?

Amount of “stuff” in an object - this will have the same value anywhere on the universe?

11
New cards

What is weight?

Weight is the force acting on an object due to gravity

12
New cards

What does the weight of an object depend on?

Depends on the strength of the gravitational field.

13
New cards

What is the unit for weight? How can weight be measured?

Newtons. Newtonmeter

14
New cards

What is the resultant force?

The overall force on a point or object

15
New cards

What does 1NM = ?

1 Joule of work

16
New cards

3 types of elasticity?

  1. Stretch

  2. Compress

  3. Bend

17
New cards

What do you need to do these types of elasticity?

You need more than one force acting on the object

18
New cards

What is elastic deformation?

An object that can go back to its original shape and length after the force has been removed. Objects that can be elastically deformed are called elastic objects.

19
New cards

What is inelastic deformation?

Doesn’t return to its original shape and length after the force has been removed

20
New cards

What is the limit of proportionality on a graph?

When the line stopes being linear becomes a curve

21
New cards

Typical speed for a person walking?

1.5 m/s

22
New cards

Typical speed for a person running?

3 m/s

23
New cards

Typical speed for a person cycling?

6 m/s

24
New cards

Typical speed of a car?

25 m/s

25
New cards

Typical speed of a train?

55 m/s

26
New cards

Typical speeds for a plane?

250 m/s

27
New cards

Difference between distance and displacement?

  1. Displacement is a vector - has a direction

  2. Distance is a scalar - doesn’t have a direction

28
New cards

Difference between speed and velocity?

  1. Speed is just how fast you’re going

  2. Velocity is speed in a given direction

You can still have a constant speed, but a changing velocity

29
New cards

Speed of sound in the air?

330 m/s

30
New cards

How can speed of sound be affected?

What medium the sound waves are travelling through

31
New cards

How can wind speed be affected by?

  1. Temperature

  2. Atmospheric pressure

  3. Large buildings or structures nearby

32
New cards

How can acceleration be defined as?

The change in velocity in a certain amount of time

33
New cards

What does the gradient of a distance-time graph signify?

Speed

34
New cards

What do flat sections of the distance-time graph?

The object is stationary

<p>The object is stationary</p>
35
New cards

What do straight uphill sections mean on a distance-time graph?

Object is travelling at a steady speed

<p>Object is travelling at a steady speed</p>
36
New cards

What do curves on a distance-time graph signify?

Acceleration or deceleration

<p>Acceleration or deceleration</p>
37
New cards

What does the gradient of a velocity-time graph signify?

Acceleration

38
New cards

What do flat sections signify on a velocity-time graph?

Steady speed

<p>Steady speed</p>
39
New cards

What does a curve mean on a velocity-time graph?

Changing acceleration

<p>Changing acceleration</p>
40
New cards

What is the area under the velocity - time graphs equal to?

Distance travelled in that time interval

41
New cards

When does friction occur?

When two surfaces are in contact, or when an object passes through a fluid

42
New cards

How to reduce drag?

Make it more streamlined

43
New cards

What is terminal velocity?

When the resultant force = 0 - when the acceleration force is equal to the frictional force

44
New cards

What does newtons 1st law state?

  1. If the resultant force on a stationary object is 0, the object will remain stationary. If the resultant force on a moving object is zero, it’ll just carry on moving at the same velocity.

45
New cards

What does Newton’s Second law state?

Acceleration is directly proportional to the resultant force (F = ma)

46
New cards

What is an object’s inertia mass?

Measures how difficult it is to change the velocity of an object

47
New cards

What does newton’s third law state?

When two objects interact, the forces they exert on each other are equal and opposite

48
New cards

What are stopping distances?

Stopping distance = thinking distance + braking distance

49
New cards

What is the thinking distance?

How far the car travels during the driver’s reaction time

50
New cards

What is the braking distance?

The distance taken to stop under the braking force

51
New cards

What are the factors of tihnking distance?

  1. Speed - the faster your going, the further you’ll travel

  2. Reaction time

    1. Tiredness

    2. Drugs/alcohol

    3. Distractions

52
New cards

What is braking distance affected by?

  1. Your speed

  2. Weather or road surface

  3. Condition of tyres

  4. How bood your brakes are

53
New cards

What is Hooke’s law?

Force is directly proportional to stretch

54
New cards

Different components of spring (think of diagram)

knowt flashcard image