Forces And Their Effects COPY

Question 1

What are vectors

Answer 1

Vectors are quantities that have magnitude and an associated direction

Question 2

What’s examples of scalars and displacement

Answer 2

Distance, speed and time

Question 3

Examples of vectors

Answer 3

Displacement, acceleration, force and momentum

Question 4

What can the distance an object loved in a straight line from a certain point be represented in

Answer 4

Distance time graph

Question 5

What can speed be determined by in an distance time graph

Answer 5

The gradient

Question 6

How do you determine the speed of an object accelerating at any particular time

Answer 6

By finding the gradient of the tangent of the distance time graph at that time

Question 7

What is the velocity of an object

Answer 7

It’s speed in a given direction

Question 8

Velocity, displacement , time taken word equation

Answer 8

Velocity = speed / time

Question 9

Acceleration velocity and time taken word equation

Answer 9

Acceleration = (final velocity - initial velocity) / time taken

Question 10

What can be determined by the gradient of a velocity time graph

Answer 10

The acceleration of an object

Question 11

How do you find the distance travelled by an object on a velocity time graph

Answer 11

It can be determined from the area under a velocity time graph

Question 12

What is the relationship between momentum mass and velocity

Answer 12

Momentum = mass x velocity

Question 13

What is conservation of momentum

Answer 13

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

Question 14

Momentum is conserved whenever objects interact, as long as

Answer 14

The objects are in a closed system so that no external forces act on them

Question 15

When two objects push each other apart, they move :

Answer 15

With different speeds if they have unequal masses With equal and opposite momentum, so their total momentum is zero

Question 16

What does the force of the impact depend on when vehicles collide

Answer 16

When vehicles collide, the force of the impact depends on mass, change of velocity and the duration of the impact

Question 17

When two vehicles collide

Answer 17

They exert equal and opposite forces on each other Their total momentum is unchanged

Question 18

What is the relationship between force , change in momentum and time

Answer 18

Force = the difference in momentum / time

Question 19

The longer the impact time,

Answer 19

The more the impact force is reduced

Question 20

How do seat belts and air bags help protect you in car accidents

Answer 20

They spread the force across the chest and increase the impact time

Question 21

What do side Impact bars and crumple zones do

Answer 21

They give way in an impact , so increasing the impact time

Question 22

When a vehicle travels at a steady speed , the …….. Forces balance the ……….. Force

Answer 22

The resistive forces balance the driving force

Question 23

The greater the speed of a vehicle,

Answer 23

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

Question 24

For a given braking force , the greater the …… ,The greater the …..

Answer 24

For a given braking force, the greater the speed, the greater the stopping distance

Question 25

What is the stopping distance of a vehicle

Answer 25

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

Question 26

Wha can a drivers reaction time be affected by

Answer 26

Tiredness, drugs and alcohol (and other distractions)

Question 27

What happens when the brakes of a vehicle are applied

Answer 27

Work done by the friction force between the brakes and the wheel reduces the kinetic energy of the vehicle and the temperature of the brakes increases

Question 28

What can a vehicles braking distance be affected by

Answer 28

Adverse roads and weather conditions and poor conditions of the vehicle

Question 29

What are scalars

Answer 29

Scalars are quantities that have magnitude only

Question 30

The faster an object moves through an object ...

Answer 30

The greater the frictional force which acts on it

Question 31

What happens to an object falling through a fluid

Answer 31

It will initially accelerate due to the force of gravity. Eventually the resultant force will be zero and the binder will move at its terminal velocity (steady speed)

Question 32

What does a parachute do to reduce the parachutists terminal velocity

Answer 32

A parachute had a large surface area and they will fall more slowly because they experience more air resistance

Question 33

When is the line on a velocity time graph horizontal

Answer 33

When an object is moving with constant velocity

Question 34

What does the line on a velocity time graph look like when an object is moving with a steadily increasing or decreasing velocity

Answer 34

Straight but sloped

Question 35

The more rapidly the velocity of the object is changing,

Answer 35

The steeper the line

Question 36

What's the relationship between weight mass and gravitational field strength

Answer 36

Weight = mass x gravitational field strength

Question 37

What may a force acting on an object cause

Answer 37

A change in the shape of the object

Question 38

What means that an object behaves elastically

Answer 38

If it returns to its original shape when the force is removed

Question 39

What will a force being applied on an elastic object such as a string result in

Answer 39

The object will stretch and store elastic potential energy

Question 40

For an object behaving elastically, the extension is directly proportional to what

Answer 40

The extension is directly proportional to the force applied, provided that he limit of proportionality is not exceeded F = k x e

Question 41

When is work done

Answer 41

When a force causes an object to move through a distance

Question 42

What is the relationship between work done, force and distance moved in the direction of the force

Answer 42

Work done = force x distance moved in the direction of the force

Question 43

When is energy transferred

Answer 43

When work is done

Question 44

What does work done against frictional forces cause

Answer 44

Energy transfer by beating

Question 45

What happens when brakes are applied in disc brakes

Answer 45

When the brakes are applied, the pads are pushed onto the disc in each wheel Friction between the pads and each disc slows the wheel down Some of the kinetic energy of the car is transferred to energy heating the disc pads and the disc

Question 46

What is the relationship between power, work Done or energy transferred and time

Answer 46

Power = energy transferred / time

Question 47

What is the relationship between gravitational potential energy, mass, gravitational field strength (acceleration of free fall and height

Answer 47

Gravitational potential energy = mass x gravitational field strength x height

Question 48

What is the relationship between kinetic energy, mass and speed

Answer 48

Kinetic energy = 1/2 x mass x speed squared

Question 49

An object of double he mass of another object travelling with the same speed will have ...

Answer 49

Double the kinetic energy

Question 50

An object travelling at double the speed of another object with the same mass will have...

Answer 50

Four times the kinetic energy

Question 51

What is the relationship between time period and frequency

Answer 51

Time period = 1 / frequency

Question 52

The time period of a pendulum depends on

Answer 52

It's length

Question 53

What are examples of applications of the pendulum

Answer 53

Simple fairground and playground rides

Question 54

When an object moves in a circle it

Answer 54

Continually accelerates towards the centre of the circle The resultant force causing this acceleration is called the centripetal force

Question 55

Where is the centripetal force always directed

Answer 55

Towards the centre of the circle

Question 56

The centripetal force needed to make an object perform circular motion increases as

Answer 56

The mass of the object increases The speed of the object increases The radius of the circle decreases

Question 57

Velocity, displacement , time taken letter equation

Answer 57

v = s / t

Question 58

Acceleration velocity and time taken letter equation

Answer 58

a = ( v - u ) / t

Question 59

Does momentum have direction

Answer 59

Yes

Question 60

Momentum, mass and velocity letter equation

Answer 60

p = m x v