Physics EOY 9

awesome + physics + super cool + epic + nice + woah + physics

speed

speed

=distance/time

average speed

= total distance/ total time

velocity

speed in a particular direction

acceleration

change in velocity/ time taken

how do you calculate distance travelled using a velocity- time graph

are under the line of the graph is distance travelled

force

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

force examples

weight, friction, air resistance, drag force

effects of balanced forces on an object

its speed will not change

effects of unbalanced forces on an object

its speed or direction will change

resultant force

sum of all forces acting on an object

Newtons first law

an object remains in a state of rest/ uniform motion unless acted on by an external force

newtons 2nd law

acceleration of an object depends on the mass of the object and the force applied

resultant Force =

mass x acceleration (f=ma)

air resistance

frictional forces of the air particles against a moving object

terminal velocity

when the air resistance equals the weight of the object, so the resultant force is zero

moment =

force x perpendicular distance from pivot

principle of moments

if an object is balanced, total clockwise moment about the pivot = total anticlockwise moment about the pivot

solid pressure=

force(N)/ area (m²)

Pa means

one n/m²

liquid pressure=

density x gravitational field strength x depth

liquid pressure (abbreviated equation)=

ρgh

because liquids are incompressible…..

they transmit changes in pressure throughout them equally

wave (2 bullet points)

• one way in which energy may be transferred between stores

• transverse or longitudinal

transverse waves (2 bullet)

• the oscillations are perpendicular to the direction of energy transfer

• light

longitudinal waves (2 bullet points)

• the oscillations are parallel to the direction of energy transfer

• eg sound

amplitude

• up or down

wavelength

left/ across

frequency equations

• f=1/t

• f=v/λ (wavespeed/ wavelength)

tera

10^12

giga

10^9

mega

10^6

kilo

10³

centi

10^-2

milli

10^-3

micro

10^-6

nano

10^-3

avg walking speed

1.5 m/s

avg running speed

3 m/s

avg cycling speed

6 m/s

avg car speed

15 m/s

acceleration definition

rate of change of velocity

weight

force due to gravity acting on mass