physics term 1 Flashcards
define Distance
the change of position of an object / the amount of ground covered
Define displacement
the change of position of an object in a particular direction
in a distance time graph, what do the lines changing mean?
line is straight (going up or down) = constant speed
it’s empty = nothing
line is straight across = not moving
line is a slope up = acceleration
line is a slope down =. deaccleration
in a velocity time graph, what do the lines mean?
nothing = object is at rest
line is straight across = constant speed
line is going straight/diagonally up = constant acceleration
line is going straight/diagonally down = constant deacceleration
line is slope up/down = varying acceleration/deacceleration
a swimmer is moving at 120N, rightwards and a force is acting at 110N, leftwards, calculate the resultant force
size of resultant force = 10N
direction of the force = right
state the force acting on the swimmer
friction
a force acting rightwards on a swimmer is 120N and a force acting leftwards on the swimmer is 120N, describe and explain the motion of the swimmer
the forces are now balanced = no resultant force
16.5 cm in mm
165 cm
the water barrel contains 0.050 m^3 of pure water. the density of pure water is 1000 kg/m^3. calculate the mass of pure water in the barrel
1000 x 0.050 = 50 kg/m^3
the density of air 1.2 kg/m^3
A room has dimensions 5.0 x 4.0x 3.0
what is the mass of the air in the room?
mass = volume x density
density is 1.2
5.0 x 4.0 x 3.0 = 60
60 x 1.2 = 72
mass of air in the room = 72 kg/m^3
please go to page 10 in your revision guide .
in an experiment the student determine the speed of a falling weight at different times. The speed-time graph for his results is show in fig. 1.3
formula = 1/2 x b x h
= 0.5 x 1.5 x 15
=11.25
a student uses a stopwatch to measure the time taken for 50 periods of a pendulum. time = 1:23:37
1 minute, 23 seconds and 37 milliseconds in seconds = 83.37.
83.37 divided by 50 (we divide by 50 because we are calculating 50 periods of a pendulum)
= 1.67
the density of sea water is 1030 kg/m^3. the density of plastic is 1000kg/m^3.
state and explain whether the full barrel will float in sea water.
correct answer: floats.
explanation: because the density of the whole barrel is 1000 kg/m^3. the density of sea water is 1030 kg/m^3. since the density of sea water is more than the density of the barrel, it will float.
