Physics EOY Flashcards
vector quantities (VADFW)
velocity, acceleration, displacement, force, weight
speed in a DT graph
gradient
distance travelled in a ST graph
area under graph
acceleration in a ST graph
gradient
Define distance
length of path travelled by an object from one position to another position
Define Displacement
distance travelled by an object btw the initial and final position in a straight line in a stated direction
Define speed
change of distance per unit time
Define velocity
change of displacement per unit time
Define acceleration
rate of velocity change
SI unit for acceleration
10m/s^2
find distance with acceleration
1/2 x acc x time
N1L
- Law of inertia
- an object will remain at rest or uniform motion unless an unbalanced force is applied
what is a force
a push/pull
N2L
acceleration of an object is directly proportional to Fr and inversely proportional to mass
N3L
for every action there is an equal and opp reaction
Define inertia
tendency for a body to continue with its state of rest or motion
- the heavier the object, the larger the inertia
weight
mass x gravity
density
mass/volume
tension
mg + ma (weight + resultant force)
kg to newton
1kg -10N
efficiency
(useful energy/total energy) x 100%
power
energy/ time or work done/time
gravitational potential energy
mass x height x 10
kinetic energy
1/2 x m x v^2
Law of COE
energy cannot be created or destroyed, only transferred from one body to another
forward thrust
acceleration
kW to W/kJ to J
1kW/kJ=1000W/J
density formula
density = mass/volume
acceleration formula
change in dist/change in time
moment formula
force x distance
principle of moments
sum of CW = sum of ACW
pressure formula
force/area
