P2.1

Question 1

What can forces cause

Answer 1

Changes to the shape or motion of an object

Question 2

What are two things that objects can do

Answer 2

Move in a straight line at a constant speed

Change their speed and or direction (decelerate or accelerate)

Question 3

What can graphs help us with

Answer 3

To describe the movement of an object

Question 4

What are the two graphs

Answer 4

Distance time graphs

Velocity time graphs

Question 5

What happens when two forces interact

Answer 5

The forces they exert on each other are opposite and equal

Question 6

What is the resultant force

Answer 6

The overall force acting on an object

Question 7

What can the resultant force do

Answer 7

May cause a change in its state of rest or movement

Question 8

What happens if the resultant force is zero on a stationary object

Answer 8

The object will remain stationary

Question 9

What happens if the resultant force of an object is not zero on the stationary object

Answer 9

The object will accelerate in the direction of the force

Question 10

What happens if the resultant force of an object is zero on a moving object

Answer 10

The object will continue to move at the same speed and in the same direction

Question 11

What happens if the resultant force of an object is not zero on a moving object

Answer 11

The object will accelerate in the direction of the resultant force

Question 12

What does the acceleration of an object determined by

Answer 12

The resultant force acting on it

The mass of the object

Question 13

What represents the speed on a distance time graph

Answer 13

The gradient

Question 14

What is velocity

Answer 14

Speed in a given direction

Question 15

What does the gradient represent on a velocity time graph

Answer 15

Acceleration

Question 16

What happens when a vehicle travels at a steady speed

Answer 16

The resistive force balances the driving force

Question 17

What are most resistive forces caused by

Answer 17

Air

Question 18

The greater the speed of a vehicle

Answer 18

The greater the braking force needed to stop it in a certain distance

Question 19

What should u understand for a given braking force

Answer 19

The greater the speed, the greater the stopping distance

Question 20

What is the stopping distance

Answer 20

Thinking distance + braking distance

Question 21

What is the thinking distance

Answer 21

The distance the vehicle travels during the drivers reaction time

Question 22

What is the braking distance

Answer 22

The distance the vehicle travels under the braking force

Question 23

What can the drivers braking distance be affected by

Answer 23

Tiredness
Alcohol
Drugs
Distractions

Question 24

What happens when the brakes are applied

Answer 24

Work is done by friction force between brake and wheel

Reduces kinetic energy

Increases temperature of brake

Question 25

What can the vehicles braking distance be affected by

Answer 25

Adverse road and weather conditions poor conditions of a vehicle

Question 26

What are included in adverse weather conditions

Answer 26

Wet or icy conditions

Question 27

What are poor conditions limited to

Answer 27

Brakes and tyres

Question 28

The faster the object moves through a fluid....

Answer 28

The greater the frictional force that acts on it

Question 29

Why will an object falling through a fluid initially accelerate

Answer 29

Because of gravity

Question 30

What might a force acting on an object cause

Answer 30

A change in shape of the object

Question 31

What will a force applied to an elastic object result in

Answer 31

The object stretching and storing elastic potential energy

Question 32

How does an elastic object return to its original shape after stretched

Answer 32

The elastic potential energy is turned into kinetic energy so when the force is removed, the object returns to its original shape

Question 33

What is the relationship between the extension of an elastic object and the force applied

Answer 33

The Extension of an elastic object is directly proportional to the force applied, provided that the limit of proportionality is not exceeded

Question 34

What is acceleration

Answer 34

How quickly the velocity is changing

Question 35

What is gravitational force

Answer 35

The force of attraction between all masses

Question 36

What are the two effects of gravity

Answer 36

On the surface area of earth it makes all things accelerate towards the ground Gives everything a weight

Question 37

What is mass

Answer 37

Amount of stuff in an object Not a force

Question 38

What is weight

Answer 38

The force of gravity pulling it towards the centre of the earth

Question 39

What is weight caused by

Answer 39

The pull of the gravitational force

Question 40

What does friction always do

Answer 40

Slow things down

Question 41

What is at the opposite direction of movement

Answer 41

Friction

Question 42

What needs to happen to travel at a steady speed

Answer 42

The driving force needs to balance the frictional force

Question 43

When do you get friction

Answer 43

When two surfaces come into contact or when an object passes through a fluid

Question 44

When does drag increase

Answer 44

When speed increase

Question 45

What needs to happen when you stop a car

Answer 45

The kinetic energy has to be converted to heat energy as friction between the wheels and the brake pads, causing temperature to rise.

Question 46

What is kinetic energy

Answer 46

Energy of movement

Question 47

What is power

Answer 47

The rate of doing work

Question 48

What is one watt

Answer 48

1 joule of energy transferred per second

Question 49

What is the unit of power

Answer 49

Watt