# Dcirnce physic p5

• Created by: Ronel.p
• Created on: 15-03-18 21:24
define scalar quantity
has a magnitude(size) only
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define vector quantity
have magnitude and a dairection
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What a force
A force is a push or pull on a object that caused by interacting with something
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what a contact force
act between objects that are touching each other
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what a non contact force
act between objects even when they are not touching each other
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What do forces change
-The speed of an object -The direction in which it is going - The shape of an object
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Give all examples of contact forces(4)
Friction/Air resistance/ Tension/ normal contact force
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Describe friction
A contact force that oppose motion
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describe Normal contact force
A force that push one object into another, the second object would push back in the opposite direction e.g a chair
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describe Tension
when a object is stretch, the force of tension is what try to put back to original shape
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Examples of Non contact forces(3)
Electrostatic, gravataional and magnetic
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Describe Electrostatic
When two object are electrically charge it will either be attracted to or rebelled from each other- depends on the charge they have
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Magnetic
like poles are unattractive and unlike poles are attracted
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Describe distance
A scalar quantity that measure how far
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Describe displacement
A vector quantity that measure how far from a particular point e.g Mark walk to 20m right then 17m left his displacement was 3
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Describe Speed
A scalar quantity that measure how fast
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Describe velocity
A vector quantity that measure how fast in a given direction
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name all vectors(5)
Displacement, velocity, acceleration, force(including weight), momentum
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describe the force of the earth and sun
The earth and sun is attracted to each other by the gravational force. A equal but opposite force of attraction is felt by both sun and earth
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describe the force of the chair and ground
chair exerts force on the ground, whilst the ground pushes back at the chair with the same force. An equal but opposite forces are felt by both the chair and the ground
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Mass
How much matter is in an object, measured in kg
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what is gravity
All the objects are attracted towards eachx other
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The force of gravity increases when:
The object has a larger mass/ are closer together
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weight
the force acting on a object due to gravity measured in N
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Mass and weight equation
W=mg
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T?he centre of mass
The centre mass of an object is the point from which its weight can be considered to act
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What does both weight and mass have in common
Both directly proportional
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Resultant force
When two or more forces on a object, they can be replaced by a single force that has the same effect as the original force combined
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When is work done
when a force causes an object to move through a distance
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What is the link to workdone and energy transferred
Work done is equal to the amount of enrgy transferred
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If an object doesnt move what does this mean
Work is not done
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Work done equation
W=fs
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Define the unit oi work
One joule of work is done on a object when a force of one newton causes a displacement to change by 1 metre
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What happens when a man pushes a box and doesn't move. Describe nergy transfered
The energy provided by the man is tranffered by friction to the thermal energy store of the box and ground
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what can a single forces do to an object
Movement, rotaion
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what can two or more forces do on a object
extension, compression and bendoing
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What is it called when a force causes a object to change shape
deformations
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Elastic deformation
When a object is deformed elastically, it will return to its orginal shape if the forces acting on it is removed
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Inelastic defermation
When a object is deformed inelastically, it will return nit return to its orginal shape if the forces acting on it is removed
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What is it called when the total change in the spring length
extension
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What is the relationship of weight and extension
Its linear( directly proportioal
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The spring equation
F=ke
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Limit of proportionality
The point beyond which the force applied to an object is no longer proportional to its extension
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Spring required practical equitment
resort stand, clamp, meter ruler, spring
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Independent variable of spring required practical
Force
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dependent variable of spring required practical
Extension
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name a error
systematic error
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speed equatiion
s=vt
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If its in a car what do u measure speed in
km/h
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Typical speed of walking
1.5m/s
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Typical speed of running
3m/s
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Typical speed of cycling
6m/s
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What does speed depend on for people
Age, fitness, terrain(how rough the surface)
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Typical speed of car
30
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Typical speed of aireaplane
200
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Typical speed of sound
330
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What is the symbol that indicate 60 mph
swilrly line
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What happens to a car velocity when its traveling around a circle
Its constantly changing because its direction of motion changing
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An example of an object which is traveling at a constant speed with a constantly changing velocity
ball attached to a string being swung around in a horizontal circle at constant speed
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An example of an object which is traveling at a constant speed with a constantly changing velocity
Car traveling around a bend at a constant speed
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An example of an object which is traveling at a constant speed with a constantly changing velocity
satellite orbiting a earth or a moon
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How can speed be calculated on a graph
From the gradient of the graph
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uniform acceleration
velocity increasing at a constant rate
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Accelerating
An object that is speeding up
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Acelleration equation
A=trainglev / T
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what is acceleration measured in
M/s 2
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traingle v measured in
m/s but the change in velocity
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Aceleration equation 2
v2-u2/ 2s
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How to calculate acceleration with equation 2
V2-U2/ 2s
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how to calculate intial velocity
normal equation
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how to calculate final velocity
v2=u2+2as
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what does a straight line on a velocity time graph mean
uniform acceleration
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how do you work out the accelaration on a velocity time graph
the gradienmt of the line
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what is the force acting on a object when its falling freely
weight
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falling object equation
F=ma
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what are examples of forces that are not so free fall
air resistance and drag
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terminal velocity
resultant force is 0 and the resistance is equal to the weight
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Newton first law
if the resultant force acting on an object is zero then its acceleration will be zero
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Newton second law
An object will accelerate if there is a resultant force acting on it.
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The acceleration of the object is
proportional to the resultant force acting on it/ inversely proportional to its mass
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Newton third law
when one object exerts a force on another object, the second object will exert an equal and opposite force on the first
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Acceleration practical independant varible
Resultant force/ mass
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Acceleration practical dependant variable
aceleration
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Acceleration practical dependant varible
Aceleratiobn
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Acceleration practical independant varible
Resultant force/ mass
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Acceleration practical dependant variable
aceleration
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Acceleration practical control variable
mass/ resultant force
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Acceleration equitment used
Pulley, light gate, trolley, data loge, masses
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Acceleration equation in practical
Average velocity= length of flag/ time taken
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Stopping distance
total distance over which car comes to rest
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Thinking distance
distance travelled while reacting
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Breaking distance
distance travelled between point at which brakes are applied and point at which car comes to rest
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Forces and braking equation
Stopping distance= thinking distance + braking distance
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average person reaction time
0.7s
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Factors affceting reaction time
Tirdness, distractions, alcohol consumption, drugs
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REaction time experiment
ruler test of dropping a ruler above someone hand
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what the link with thinking distance and speed in a stopping disatnce chart
thinking distance is proportional to spped
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what the link with braking distance and speed in a stopping disatnce chart
braking distance is proportional to speed 2
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What is the braking distance affected by
condition of it brakes and tyres/ type of road surface/weather conditions/ size of the braking force
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What does driving more slowly affect
the braking force needed to stop in a given direction
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## Other cards in this set

### Card 2

#### Front

define vector quantity

#### Back

have magnitude and a dairection

### Card 3

What a force

#### Back ### Card 4

#### Front

what a contact force

#### Back ### Card 5

#### Front

what a non contact force

#### Back 