Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Combined Physics 11A2 > Forces > Flashcards

Forces Flashcards

To revise forces (Paper 2)

You may prefer our related Brainscape-certified flashcards:
Physics 101 flashcards AP® Physics flashcards
1
Q

Define a scalar

A

A quantity that only has magnitude.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Give some examples of scalar quantities

A

Speed, distance, time, mass, volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define a vector quantity

A

A quantity that has magnitude and direction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Give some examples of vector quantities

A

Velocity, displacement, acceleration, momentum, any force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

State some examples of contact forces

A

Friction, air resistance, drag, upthrust, tension, normal contact force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

State some examples of contact forces

A

Gravity, magnetism, electrostatic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

State the equation with all units for Weight

A

weight (N) = mass (kg) × gravitational field strength(N/kg)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the mathematical relationship between weight and mass.

A

They are directly proportional

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What equipment can be used to measure weight?

A

Weight is measured using a calibrated spring-balance called a newtonmeter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Define a resultant force

A

When a number of forces acting on an object may be replaced by a single force that has the same effect as all the original forces acting together.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

When is work done?

A

When a force causes an object to move through a distance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the relationship between work done and energy transferred

A

Work done = energy transferred

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

State the equation and all units for work done

A

work done (J) = force (N) × distance moved along the line of action of the force (m)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Define 1 joule of work

A

One joule of work is done when a force of one newton causes a
displacement of one metre. 1 joule = 1 newton-metre

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

State Hooke’s law

A

The extension of an elastic object, such as a spring, is directly proportional to the force applied, provided that the limit of proportionality is not exceeded.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

State Hookes law equation with all units

A

force (N) = spring constant (N/m) × extension (m)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

When an object is stretched or squared what form of energy does it store?

A

Elastic potential energy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Define elastic deformation

A

When the forces are removed the object returns to its original length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Define inelastic deformation

A

When the forces are removed the object doesn’t returns to its original length, it stays permanently stretched.

20
Q

State the difference between distance and displacement

A

Distance is a scalar - doesn’t involve direction
Displacement is a vector and is measured in a straight line from the start point to the finish point and the direction of that straight line.

21
Q

State the difference between speed and velocity

A

Speed is a scalar

Velocity is a vector

22
Q 
State the following typical speeds:
walking
Running
Cycling
Sound
A

walking - 1.5 m/s
Running - 3.0 m/s
Cycling - 6.0 m/s
Sound - 330 m/s

23
Q

State the equation with all units to calculate speed

A

distance (m) = speed (m/s) × time (s)

24
Q

how can speed be calculated from a distance - time graph

A

Using the gradient

25
Q

State the equation to calculate average acceleration, with all units

A

acceleration = change in velocity / time

acceleration - m/s2
velocity - m/s
time - s

26
Q

How can acceleration be found from a velocity - time graph

A

From the gradient

27
Q

How can displacement be found from a velocity - time graph

A

From the area under the line

28
Q

What is the rate of acceleration for an object falling close to the earths surface?

A

9.8 m/s2

29
Q

What is terminal velocity and when does it occur?

A

the maximum velocity an object can fall at, this happens when forces are balanced

30
Q

What factors can increase the size of air resistance

A

Speed
Surface area
Density of the fluid which the object is falling through

31
Q

State Newtons first law

A

if the resultant force acting on an object is zero the object will stay at rest or move at a constant velocity

32
Q

The tendency of objects to continue in their state of rest or of uniform motion is called?

A

Inertia

33
Q

State Newtons second law

A

The acceleration of an object is proportional to the resultant force acting on the object, and inversely proportional to the mass of the object.

34
Q

State the equation with all units for Newtons Second law

A

resultant force (N) = mass (kg) × acceleration (m/s2)

35
Q

Define inertial mass

A

Inertial mass is a measure of how difficult it is to change the velocity of an object
inertial mass is defined as the ratio of force over acceleration.

36
Q

State Newton’s third law

A

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

37
Q

Define stopping distance

A

The stopping distance of a vehicle is the sum of the distance the vehicle travels during the driver’s reaction time (thinking distance) and the distance it travels under the braking force (braking distance).

38
Q

Define thinking distance

A

the distance the car travels whilst a driver reacts to a situation

39
Q

Define braking distance

A

the distance the car travels whilst the brakes are applied

40
Q

State the typical reaction times for a human

A

0.2 s to 0.9 s.

41
Q

State some factors that can affect a persons reaction times

A

tiredness, ages, drugs and alcohol, Distractions

42
Q

State some factors that can affect the braking distance of a car

A

Rain, ice, snow, poor quality brakes, poor quality tyres, gradient of the road, mass of the car

43
Q

State the one factor that can increase both the thinking distance and braking distance

A

Speed

44
Q

State the equation for momentum

A

momentum = mass × velocity

45
Q

State the units for momentum

A

kg m/s

46
Q

Define the conservation of momentum

A

In a closed system, the total momentum before an event is equal to the total momentum after the event.

Combined Physics 11A2 (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions