P10 Force and Motion P14 Light

Question 1

Resultant Force Equation:

Answer 1

Mass x acceleration

Question 2

Newton’s second law of motion

Answer 2

States that acceleration of an object is proportional to the resultant force of the object

States that acceleration of an object is inversely proportional to the mass of the object

Question 3

What is the inertia of an object

Answer 3

It’s tendency to stay at rest or in uniform motion

Question 4

What’s the weight of an object

Answer 4

The force acting on the object due to gravity. It’s mass is the quantity of matter in the object

Question 5

At what speed of an object active only by gravity accelerate at

Answer 5

10 mph squared

Question 6

Terminal velocity

Answer 6

The terminal velocity of an object is the velocity it eventually reaches when it is falling. The weight of the object is that equal to the frictional force on the object

Question 7

What is the resultant force on an object moving at its terminal velocity

Answer 7

Zero

Question 8

What does the stopping distance depend on

Answer 8

The braking distance and the thinking distance

Question 9

What is opposes the driving force of the vehicle

Answer 9

Friction and air resistance

Question 10

Thinking distance

Answer 10

The distance travelled by the vehicle in the time it takes the driver to react (reaction time)

Question 11

Stopping distance

Answer 11

This is the shortest distance of the vehicle can safely stop in

Question 12

Breaking distance

Answer 12

The distance travelled by the vehicle during the time the braking force acts

Question 13

Equation for stopping distance

Answer 13

Thinking distance + braking distance

Question 14

What sort of factors increase braking distance

Answer 14

High-speed, poor weather conditions and poor vehicle maintenance

Question 15

What sort of factors increase thinking distance

Answer 15

Poor reaction time due to tiredness alcohol drugs or using a mobile phone and high-speed both increase the thinking distance

Question 16

Equation for breaking force of the vehicle

Answer 16

F= m x a

Question 17

Equation for momentum

Answer 17

p = m x v

Question 18

Momentum units

Answer 18

kg m/s

Question 19

Momentum is an example of what

Answer 19

A vector quantity

Question 20

What is a close system in the context of momentum

Answer 20

A system in which the total momentum before an event is the same as the total amount momentum after the event. This is called conservation of momentum

Question 21

What happens when two objects push each other apart

Answer 21

They move a different speeds if they have unequal masses and with equal and opposite momentum so the total momentum is zero

Question 22

Equation for momentum, when two objects recoil from each other

Answer 22

m1 v1 + m2 v2 = 0

Question 23

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

Answer 23

On the mass, change of velocity and the length of the impact time

Question 24

How does impact time affect the impact force

Answer 24

The longer the impact time the more the impact forces reduce

Question 25

What happens when two vehicles collide

Answer 25

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

Question 26

Impact force equation

Answer 26

Impact force = change of momentum / impact time | So the short the impact on the greater impact force

Question 27

How do you cycle helmet and cushioned surfaces, for example in playground, help to reduce the impact forces

Answer 27

By increasing the impact time

Question 28

How do you seatbelt and airbag help to decrease the impact forces

Answer 28

By spreading the force across the chest and increasing the impact time

Question 29

What can conservation of momentum be used for, after car experiences impact

Answer 29

The speed of the car

Question 30

Why are side impact bars and crumble zones installed

Answer 30

To give way in an impact and so increase the impact time

Question 31

When with an object by classified as elastic

Answer 31

If you're returned to its original shape after removing the force deforming it

Question 32

What is the extension of an elastic object

Answer 32

The difference between the length of the object and its original length

Question 33

What is the extension of the spring is directly proportional to

Answer 33

To the force applied to it as long as the limit of proportionality is not exceeded, this relationship is linear

Question 34

What happens beyond the limit of proportionality in an elastic object

Answer 34

The extension of the spring is no longer proportional to the applied force, this relationship becomes non-linear

Question 35

What is the normal at a point on a mirror

Answer 35

A line drawn perpendicular to the mirror

Question 36

The law of reflection states:

Answer 36

The angle of incidence is equal to the angle of reflection

Question 37

For a light ray reflected by a plane mirror what is the angle of incidence and the angle of reflection?

Answer 37

The angle of incidence and the angle between the incident ray and the normal The angle for flexion is the angle between the reflected ray and the normal

Question 38

Specular reflection

Answer 38

His reflection in a single direction without scattering

Question 39

Diffuse reflection

Answer 39

It's reflection from a rough surface that scatters the light

Question 40

Refraction

Answer 40

Is the changing direction of the waves when they travel across a boundary from one medium to another (different densities)

Question 41

What happens when the light ray Travels from air to glass

Answer 41

The light grey with cracks as it covers from air into glass, the angle of refraction is less than the angle of incidence

Question 42

What happens on the light rail travels from glass into air

Answer 42

As it travels from glass into at the angle of a fraction is more than the angle of incidence

Question 43

How does the wavelength of light differ when you move from Violet to read across the visible spectrum

Answer 43

The wavelength increases

Question 44

What does the colour of the surface depend on

Answer 44

On the pigments of the surface materials and the wavelength of light that pigments absorb

Question 45

A translucent object...

Answer 45

Let's light passes through it but scatters or reflects the light inside it

Question 46

A transparent object...

Answer 46

Let's all the light that enters it pastorate and does not start or affect the lights inside the object

Question 47

What do you convex lenses do

Answer 47

Focuses parallel rays to a point called the principal focus (by coverging them)

Question 48

What are examples of where convex lenses are used

Answer 48

A converging lens is used as a magnifying glass and in a camera to form a clear image of a distant object

Question 49

What do you concave lenses do

Answer 49

Makes parallel rays spread out as if they had come from a point called the principal focus

Question 50

Find me a diverging lens be used

Answer 50

To correct short sight

Question 51

What is the focal length

Answer 51

The distance from the centre of the lens to the principal focus

Question 52

When is a real image formed

Answer 52

I real image is formed by a convex lens if the object is further away than the principal focus

Question 53

When is it a virtual image formed

Answer 53

A virtual image is formed by a convex lens if the object is nearer than the principal focus

Question 54

Equation for magnification

Answer 54

Magnification= image height / object height

Question 55

What happens to an object when it is placed between a convex lens and its principal focus

Answer 55

The image formed is virtual upright magnified and on the same side of the lens as the object

Question 56

What is the convex lens in a camera used for

Answer 56

To form a real image of an object

Question 57

What is the convex lens in a magnifying glass form

Answer 57

It forms a virtual image of an object