Forces

Question 1

What quantity is displacement?

Answer 1

Vector quantity (has magnitude and direction)

Question 3

What is braking distance?

Answer 3

Distance travelled under the breaking force

Question 4

What is breaking distance affected by?

Answer 4

Road condition, vehicle condition, weather

Question 5

What are some examples of vehicle condition that affect breaking distance?

Answer 5

Worn brakes or tyres, over or underinflated tyres

Question 6

What are some weather conditions that affect breaking distance?

Answer 6

Snowy or icy roads

Question 7

For a given breaking distance what does doubling the mass do?

Answer 7

Doubles the force required

Question 8

For a given breaking distance, doubling the speed does what?

Answer 8

Quadruples the force required

Question 9

What quantity is distance?

Answer 9

Scalar quantity (how far an object moves, doesn’t take into account the direction an object is travelling)

Question 11

What is Newton’s first law?

Answer 11

An object will remain in the same state of motion unless acted upon by an external force

Question 12

Define mass?

Answer 12

Amount of matter it contains and remains constant

Question 14

What does the weight of an object depend on?

Answer 14

Depends on the Gravitational field strength where the object is and is directly proportional to its mass

Question 15

What do vector quantities have?

Answer 15

Magnitude (size) and direction

Question 16

What does velocity show?

Answer 16

Speed and direction of travel

Question 17

Are mass and weight the same?

Answer 17

NO

Question 18

What’s the difference between mass and weight?

Answer 18

Mass:Amount of substance present in an object
Weight:Force acting on mass

Question 19

What is weight?

Answer 19

Force acting on mass due to gravity

Question 20

What is mass?

Answer 20

Amount of substance present in an object

Question 21

Arrows are used to present vector quantities, what does the length pf the arrow represent?

Answer 21

Magnitude (size)

Question 22

Arrows are used to present vector quantities, what does the arrow point direction show?

Answer 22

The direction that the vector quantity is acting

Question 23

What is a scalar quantity ?

Answer 23

Has magnitude (size) only like number of apples

Question 24

What is an example of a scalar quantity?

Answer 24

Speed, distance

Question 25

What is a vector quantity?

Answer 25

Has magnitude and direction

Question 26

What is an example of a vector quantity?

Answer 26

Forces

Question 27

What is Newton's third law?

Answer 27

For every action there is an equal and opposite reaction

Question 28

Examples of contact forces?

Answer 28

☆Friction ☆Air resistance ☆Tension ☆Normal contact

Question 29

Examples of non-contact forces?

Answer 29

☆Gravitational force ☆Electrostatic force ☆Magnetic force

Question 31

Define contact force?

Answer 31

Objects are physically touching

Question 32

Describe the 4 steps of a skydivers terminal velocity?

Answer 32

1)Skydiver accelerates due to the force of gravity 2)Experiences frictional force due to air resistance,weight is a greater force so he keeps accelerating 3)Speed and resistive force increase, acceleration decrease 4)Resistive force increases until it is the same as weight, resultant force is zero, Skydive falls at terminal velocity

Question 33

What is a more in depth explanation of newton's third law?

Answer 33

Whenever an object exerts a force on another, the other object exerts a force back. Reaction force is the same type and equal size but opposite direction

Question 34

Is amount of work done equal to energy stored in a spring?

Answer 34

Yes, provided the spring doesn't go past the limit of proportinality

Question 35

Define spring constant?

Answer 35

Indicates how easy it is to stretch or compressed a spring

Question 36

What does it mean in terms of stiffness, the higher the spring constant?

Answer 36

The stifer the spring

Question 37

How does travelling faster affect the braking force?

Answer 37

Travelling faster results in a larger breaking force needed

Question 38

What happens if the breaking force is too great?

Answer 38

The brakes may overheat or tyres lose traction on the road = car skids

Question 39

When resultant force acting on an object is zero what happens? (1ST LAW)

Answer 39

Object stationary=remains stationary Object moving=continues moving

Question 40

What is constant velocity?

Answer 40

To move at the same speed in the same direction

Question 41

When does velocity change?

Answer 41

Velocity only changes of a resultant force is acting on it

Question 43

When does the resultant force reach 0?

Answer 43

When resistive forces balance the force of gravity, now the object falls at a steady speed and is at terminal velocity

Question 44

What energy is stored when a force stretches or compresses a spring?

Answer 44

Stores elastic potential energy

Question 45

What are non-contact foreces?

Answer 45

Objects are physically separated, attraction and reclusion between objects

Question 46

What is the limit of proportionality?

Answer 46

Point up to which an elastic object is directly proportional to applied forces

Question 47

What is the extension of an elastic object directly proportional to?

Answer 47

Directly proportional to the applied force (straight line on graph)

Question 48

What is done when a force causes an object to move?

Answer 48

Work is done on the object

Question 49

Does work done require energy?

Answer 49

Yes (1J work done=1NM displacement)

Question 50

What is elastically deformed?

Answer 50

Returns to shape after force is removed

Question 51

Define inelastically deformed?

Answer 51

Doesn't return to shape after

Question 52

What is Newton's second law?

Answer 52

Acceleration of an object is proportional to the resultant force acting on an object and inversely proportional to the mas of object

Question 53

What happens to acceletation if resultant force is doubled? 2nd law

Answer 53

Resultant force doubled=acceletation doubled

Question 54

What happens to acceletaton if mass is doubled? 2nd law

Answer 54

Acceleration halves

Question 55

What equation sumariese Newton's second law?

Answer 55

Force=mass x acceleration

Question 56

How does the temperature of car breaks increase?

Answer 56

Work done (breaking) by this frictional force transfers the kinetic energy of the vehicle into heat energy, car breaks temp increase

Question 57

What does calculating a mean do?

Answer 57

Reduces the effect of random errors

Question 58

What are forces?

Answer 58

Vector quantities

Question 59

What does gravitational field cause a mass to experience?

Answer 59

Causes mass to experience a force

Question 60

What human reaction time affected by?

Answer 60

Drugs, alchol, tiredness, mobile phone use

Question 61

How is stopping distance calculated?

Answer 61

Sum of thinking distance and breaking distance

Question 62

What happens to energy when work is done?

Answer 62

Energy increases to overcome Friction

Question 63

What happens to energy systems when work is done?

Answer 63

Energy transfers take place in a system when work is done

Question 64

How does a vehicle stop?

Answer 64

Breaks need to apply force to wheels

Question 65

What happens to the deceleration the greater the breaking force?

Answer 65

The greate the vehicle deceleration

Question 66

Define speed?

Answer 66

Measure of how fast ahn object is travelling

Question 67

What does the speed a person can walk/run depend on?

Answer 67

Factors like age

Question 68

What is quantuty is speed?

Answer 68

Scalar quantity measured in m/s

Question 69

Define acceleration?

Answer 69

Measure of how quickly an object speeds up, slows down, changes direction

Question 70

What happens to a spring when the limit of proportionality is exceeded? (Relation)

Answer 70

•Doubling the force, no longer doubles the extension •Non-linear Relation •F-E graph stops being a straight line

Question 71

Define resultant force?

Answer 71

When more or one force acts on an object they can be seen as one single force which has the same effect as all the forces acting together

Question 72

Whst is the extension of an elastic object directly proportional to?

Answer 72

The applied force (produce straight line on F-E graph)

Question 73

If 1Joule of work is done, what is the displacement value?

Answer 73

1joule work done = 1Nm displacement