5-7 Flashcards by James Lakaj

What is a scalar?

Just a number ( E.g distance, mass, speed)

How well did you know this?

Not at all

Perfectly

What is a vector?

A number and direction (E.g displacement, weight, acceleration, force and momentum)

How well did you know this?

Not at all

Perfectly

What does the resultant force equal?

Resultant force = difference between forces.

How well did you know this?

Not at all

Perfectly

Equation for weight?

w = m x g
weight - (n)
mass - (kg)
gravity - (n/kg)

How well did you know this?

Not at all

Perfectly

What is the equation for work?

w = f x s
work - (j)
force - (n)
distance - (m)

How well did you know this?

Not at all

Perfectly

What is 1 Joule equal to?

1 Joule is equal to 1 N/m

How well did you know this?

Not at all

Perfectly

What is Hooke’s law?

When you exert a force on an object it is going to be squashed, stretched or deformed.

How well did you know this?

Not at all

Perfectly

What happens to a spring if you attach more weight?

More weights added = longer spring.

How well did you know this?

Not at all

Perfectly

What is the limit of proportionality?

Where no matter how much more weight is added the spring will not stretch any further.

How well did you know this?

Not at all

Perfectly

What is the equation for acceleration?

a = (change in) velocity/time
acceleration - (m/s^2)
velocity - (m/s)
time - (s)

How well did you know this?

Not at all

Perfectly

Change in velocity equation?

v^2-u^2 = 2 x a x s
v(final velocity) - (m/s)
u(initial velocity) - (m/s)
a(acceleration) - (m/s^2)
s(distance) - (m)

How well did you know this?

Not at all

Perfectly

Speed of free fall and also gravity?

s= 9.8m/s
g= 9.8n/kg)

How well did you know this?

Not at all

Perfectly

When is terminal velocity reached?

When all forces are balanced.

How well did you know this?

Not at all

Perfectly

Equation for Force?

f = k x e
Force - (n)
Spring constant (k) - (n/m)
extension (e) - (m)

How well did you know this?

Not at all

Perfectly

Kinetic Energy equation?

Ek = 1/2 x m x v^2
Kinetic energy (Ek) - (J)
Mass (m) - (kg)
Velocity (v^2) - (m/s)

How well did you know this?

Not at all

Perfectly

Equation for pressure?

-Involving force and area

P = F/A
Pressure (P) - (Pa_Paschal)
Force (F) - (N)
Area (A) - (m^2)

How well did you know this?

Not at all

Perfectly

Equation for distance?

s = v x t
Distance (s) - (m)
Velocity (v) - (m/s)
Time (t) - (s)

How well did you know this?

Not at all

Perfectly

Pressure equation?

-Involving height, density and gravitation field strength

P = h x p x g
Pressure (P) - (Pa_ paschal)
Height (h)- (m)
Gravitational Field Strength (g) - (9.8n/kg)

How well did you know this?

Not at all

Perfectly

Liquids are…

Incompressible

How well did you know this?

Not at all

Perfectly

Gases are…

Compressible

How well did you know this?

Not at all

Perfectly

Equation for Force?

-Involving mass and acceleration

F = m x a

How well did you know this?

Not at all

Perfectly

Stopping Distance =

Thinking Distance + Braking Distance

How well did you know this?

Not at all

Perfectly

Things that effect thinking distance?

Alcohol, drugs, Tiredness (Positive is Caffeine)

How well did you know this?

Not at all

Perfectly

Things that Effect Braking Distance?

Conditions of tyres
Condition of road
Weight of car

How well did you know this?

Not at all

Perfectly

Car Safety?

Seat belts Baby seat Crumple Zones Airbag

Momentum equation? | -Involves mass and velovity

P = m x v

What is the law of conservation of momentum?

Momentum is always conserved so the moment before = moment afterwards

What is inertia?

An object that is in motion will remain in motion, unless acted on by and outside force. An object in rest will remain in rest unless acted by an outside force.

What is Newton's third law?

Where for every action there is an equal and opposite reaction.

The law of conservation of energy?

Energy is never created or destroyed, only transformed into something else. (Usually Heat)

What do we use to measure the speed of a wave?

Ripple Tank

Equation for wave speed?

Wave speed = f x wavelength (lamba)

Radio waves have what sort of energy? frequency? and wavelength?

Low energy Low frequency Long wavelengths

Gamma rays have what sort of energy? frequency? and wavelength?

High energy High frequency Short wavelength

Transverse waves movement?

Up and down

Longitudinal wave movement?

Sideways (to the right)

Low frequency means..

Not many peaks but a high wavelength.

High frequency means..

Lots of peaks but a low wavelength.

Frequency is..

Number of waves per second.

To calculate frequency?

T = 1/f | f- frequency

Rare fraction and compression on a longitudinal wave?

Rare fraction = not many dots | Compression = lots of dots together

Good absorbers: Good emitters: Good reflectors:

Good absorbers: dark and matt Good emitters: dark and matt Good reflectors: shiny

How can you induce a magnet?

You can induce a magnet by putting something in the magnetic field.

Magnetic materials?

Iron Nickel Cobalt

What is diffraction?

Diffraction happens when a wave passes through a gap, the wave will curve around as it comes out that gap. The amount of curviture (diffraction) depends on the size of the gap.

What is refraction?

Refraction is when a wave passes from one medium to another medium. It will change direction because the wave changes speed but different part of the wave changes speed at different points.

How can you change the strength of an electromagnet?

Change current | Change amount of coils

Left hand rule- fingers

Thumb is Movement Index finger is field Current is middle finger

How can you make an electro magnet?

Battery Wire Iron Nail

How does electromagnetism work?

1. When a current is passed through a wire it creates a magnetic field around the wire. 2. This in turn strongly magnetises the iron bar. 3. Thus creating the electromagnet.

How does a Moving coil loudspeaker work?

Works by making a diaphragm attached to a coil vibrate. - Current is passed through coil, this generates a force. - Each change in direction causes a change in vibration in the diaphragm.

How does a Moving coil microphone work?

Vibration causes the coil to move past a magnet, generating current. - Vibration causes coil to move past a magnet, generating current.

Force is greatest when the wire is _______ with the magnetic field lines.

Perpendicular.

The force is 0 when the magnetic field lines are _______.

Parallel.

What is magnetic flux density?

Amount of magnetic flux in a certain area.

Force equation? | - Involves magnetic flux density, current and length

F = B x I x L

Sound waves are what waves?

Longitudinal.

Range of human hearing?

20Hz to 20KHz

What can ultra sound be used for?

Determining distance + pregnancy.

Speed equation? | -Involving distance and time

S = D/T

Unbalanced forces have what forces?

Unequal.

Balanced force have what forces?

Equal.

Moment equation? | - Involving force and distance

M = f x d

Force equation? | - Involving mass and velocity and time

f = (mx change in velocity)/change in time

Angle of incidence =

Angle of reflection

When sound waves are reflected they..

Echo

What are p waves + properties?

Primary waves - longitudinal - solids and liquids

What are s waves + properties?

Secondary waves - transverse - solids

What do converging lenses do?

Correct long sightedness - real image - magnified

What do diverging lenses do?

Correct short sightedness - virtual image - upright - small

Magnification equation?

Magnification = Image height/ object height (MIA)

Red colour properties:

Freq = 4 x 10^14 Hz Wavelength: 7 x 10^-7m

Violet colour properties:

Freq = 7 x 10^14 Hz Wavelength: 4 x 10^-7m

Tranformer Calculations:

Vp/Vs= Np/Ns . Vs x Is = Vp x Ip

Step up transformer voltage?

Secondary voltage Vs > Primary voltage

Step down transformer?

Secondary Voltage Vs < Primary voltage

What is a black body?

Black body is an object in space which absorbs radiation.

What emits infrared radiation?

Everything

The Generator Effect?

Movement of wire through a magnetic field produces a current.

Plants in order

My Very Easy Method, Just Speeds up Naming,

What galaxy do we live in?

Milky Way

If a galaxy is coming towards us what type of light?

Blue shifted

If a galaxy is moving away from us what type of light?

Red shifted

What is speed?

How fast you are going. Scalar

What is velocity?

How fast you are going in a certain direction. Vector.

Red shifted properties?

Increased wavelength | Decreased frequency

Blue shifted properties?

Decreased wavelength | Increased Frequency