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physics ep

define the term force

a push or a pull that acts on an object due to the interaction with another object

measured in newtons with newtonmeter


vector quantity

what is a vector quantity

any quantity that has both magnitude ( size) and direction

name 6 types of forces

1.Friction
2.Magnetic

3Air resistance

4Electrostatic

5Upthrust

6Magnetic

define air resistance

the force that opposes the movement of objects through air

Define friction

the force that opposes motion

define gravitational force

the force that causes by weight

define upthrust

the force experienced by objects when theyre placed into fluid

define electrostatic force

repulsive or attractive forces between particles that are caused by their electric charge

define unbalance force

the force apply to an object to one direction is greater than the force apply to the opposite direction

what is a brittle material

doesn't change shape but will break e.g. glass

what is a resilient material

it dont break easily

describe an elastic material

return to their orginal shape when the forces are removed

describe plastic materia

retain their new shape

describe the method on how to carry out an experiment to investigate the relationshp between friction and mass .

1) set up equipments as in diagram
2) pull the newtonmeter until mass is just about to move

3)remove 100g and repeat step 2

4)repeat until all mass removes then do it all again

5)plot a graph of force against mass

What is a current

a flow of electrical charge
-measured by an ampmeter

- I = P/V

-I = Q/T

define center of mass

the point where the point is said to act from
- usually at the center of an object

stopping distance

the sum of thinking distance and braking distance

define thinking distance

the distance travelled by a vehicle b4 the brakes are applied
- affected by speed of the vehicle + reaction time of the driver

define stopping distance

the distance travelled by a vehicle after the brakes are applied until the moment when the vehicle completely stops
-affected by mass + speed of the vehicle

-road surface

-quality of the brakes and tyres

terminal velocity meaning

when falling objects velocity remains constant ( they are still falling but not accelerating or decelerating )

resultant force

the combination of all the forces acting on an object

hooke's law equation

force = spring constant x extension
- k( newton ). cm or m

newton's 1st law

an object will remain at rest or constant velocity unless acted upon a net force

newton's second law ( force)

Net force = mass x acceleration

newton's third law

for every action , there is an equal and opposte reaction

equation for moment

moment = force x perpendicular distance

equation for average speed

avg speed = distance / time

charge equation

current x time
symbol Q

unit : coulomb

Q=IT

how does paint sparying work using electrostatic attraction

the spray paint gun is charged positively , causes every paint particle to become posetively charged - since all paint particles have the same charge , they repel each other and produce a fine mist of paint .

ionisation meaning

the process which atoms lose or gain electrons to become charged

give one hazaed caused byy electrostatic charges + how to prevent

can gives you electric shock , you need to earth the object

equation for energy

E = I x V x T
E = Q x V

E= P x T

measured in joules

difference between displacement and distance

displacement = vector
distance = scalar

define power

the rate at which energy is transferred
P=IV

watts

define voltage

volts - measure the energy trasferred per coulomb of charge
V= P/I

V= E/Q

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