forces core knowledge

Question 1

A value with magnitude only is a ________?

Answer 1

scalar

Question 2

A value with magnitude and direction is a ____________?

Answer 2

vector

Question 3

Distance an speed are examples of _________ quantities

Answer 3

scalar

Question 4

Force, displacement and velocity are examples of __________ quantities

Answer 4

vector

Question 5

What is a contact force?

Answer 5

A force between two object which are touching

Question 6

What is a non-contact force?

Answer 6

A force between objects which are separated by space.

Question 7

Give two examples of contact forces

Answer 7

e.g., friction, air resistance

Question 8

List three non-contact forces

Answer 8

gravitational, electrostatic, magnetic

Question 9

Define weight

Answer 9

The force of gravity acting on an object’s mass

Question 10

What device is used to measure weight?

Answer 10

A newtonmeter

Question 11

What is the name of the single point at which an object’s mass appears to act?

Answer 11

centre of mass

Question 12

The center of mas of an object is…

Answer 12

the single point at which the objects weight appears to act.

Question 13

The single force which has the same effect as the combination of all the different forces acting on an object is the ______________ _______________.

Answer 13

resultant force

Question 14

Work is done when an object is ….

Answer 14

… moved through a distance

Question 15

Moving objects with mass are said to have __________?

Answer 15

momentum

Question 16

State the law of conservation of momentum

Answer 16

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

Question 17

What is the unit of weight?

Answer 17

Newtons (N)

Question 18

what is the unit of mass?

Answer 18

kilograms (kg)

Question 19

What is unit of gravitational field strength?

Answer 19

newtons per kilogram (N/kg)

Question 20

What is the unit of work done?

Answer 20

Joules (J)

Question 21

What is the unit of force?

Answer 21

Newtons (N)

Question 22

What is the unit of distance?

Answer 22

meters (m)

Question 23

What is the unit of the spring constant?

Answer 23

Newtons per meter (N/m)

Question 24

What is the unit of the spring extension?

Answer 24

Metres (m)

Question 25

What is the unit of speed or velocity?

Answer 25

metres per seconds (m/s)

Question 26

What are the units of acceleration?

Answer 26

metres per second squared (m/s2)

Question 27

What are the units of momentum?

Answer 27

kilogram metres per second (kg m/s)

Question 28

When a spring is stretched and can then return to its original length it is known as __________ _______________

Answer 28

elastic deformation or elastic behavior

Question 29

When a spring is stretched and its length is

Answer 29

Inelastic deformation or inelastic behaviour permanently altered it is known as ___________ ____________

Question 30

The limit of proportionality of a spring is...

Answer 30

the length a spring can be stretched to before it no longer returns to its original length

Question 31

The stopping distance of a vehicle is the sum of the .....

Answer 31

thinking and breaking distances

Question 32

The distance a vehicle travels while the driver is reacting is the ...

Answer 32

thinking distance

Question 33

The distance a vehicle travels which the driver is breaking is the ...

Answer 33

breaking distance

Question 34

Reaction time is...

Answer 34

the time it takes a driver to react

Question 35

Factors which influence reaction time are...

Answer 35

tiredness, drug, alcohol, distractions

Question 36

Factors which affect breaking distance are ...

Answer 36

weather conditions, conditions of breaks and tires

Question 37

Both thinking and breaking distance are affected by which factor?

Answer 37

speed of vehicle

Question 38

The distance an object moves and the direction in which it moves is known as the _________

Answer 38

displacement

Question 39

The speed of an object in a particular direction is its ___________

Answer 39

velocity

Question 40

The change of an objects speed in a given time is the _________

Answer 40

acceleration

Question 41

Acceleration of falling objects close to the earth is ________

Answer 41

9.8 m/s2

Question 42

When the force moving an object is balanced by frictional forces it is moving at its _____________ _____________

Answer 42

terminal velocity

Question 43

On a distance time graph a straight line represents...

Answer 43

constant speed

Question 44

On a distance time graph a upward curve represents...

Answer 44

acceleration

Question 45

On a distance time graph a curved line becoming horizontal represents...

Answer 45

Deceleration

Question 46

On a distance time graph a horizontal line represents...

Answer 46

stationary

Question 47

On a distance time graph the gradient is used to calculate the ...

Answer 47

speed or velocity

Question 48

On a velocity time graph an upwards straight line represents ...

Answer 48

acceleration

Question 49

On a velocity time graph a downwards straight line represents ...

Answer 49

deceleration

Question 50

On a velocity time graph a horizontal line represents ...

Answer 50

constant speed

Question 51

On a velocity time graph a horizontal line along the x-axis represents...

Answer 51

stationary object

Question 52

On a velocity time graph, when the line falls below the x-axis it indicates that the object is ...

Answer 52

moving backwards

Question 53

Calculating the gradient of a velocity time

Answer 53

acceleration graph gives the ...

Question 54

Calculating the area under a velocity time graph gives the ...

Answer 54

distance travelled

Question 55

State Newton's First Law

Answer 55

The velocity of an object will only change if a resultant force is acting on the object.

Question 56

If balanced forces act on a moving object, it will ...

Answer 56

continue to travel at a constant speed

Question 57

If balanced forces act on a stationary object, it will ...

Answer 57

remain stationary

Question 58

State Newton's Second Law

Answer 58

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

Question 59

State Newton's Third Law

Answer 59

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

Question 60

The tendency of objects to continue in their state of rest or of uniform motion is known as ...

Answer 60

inertia