Physics June P1
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Free fall
the motion of an object under the influence of gravity only
projectile
n object launched with an initial velocity and upon which the only force action is the force of gravity
when is no work done on an object
No displacement force acts perpendicular to the displacement
work energy theorem
the net work done on an objects equal to the change in the object’s kinetic energy
power
the rate at which work is done (scalar quantity measured in watts)
when do you use the principle of conservation of Emech
when there is no friction
conservative force
a force for which the work done in moving an object between two points is independent of the path taken
non conservative force
a force for which the work done in moving an object between two points depends on the path taken
gravitation potential energy
energy an object has because of its position in the gravitational field relative to a reference point
kinetic E
Energy an object has as a result of its motion
mechanical E
sum of an object’s kinetic and potential E
momentum
product of objects mass and velocity (p=mv)
Newton’s 2nd law of motion in terms of momentum
the net force acting on an object is equal to the rate of change of momentum of the object in the direction of the net force
impulse
product of net force and time
isolated system
system on which the net external force is zero
elastic collision
total kinetic E is conserved
doppler effect
the apparent change in frequency of a sound detected by a listener as a result of the relative motion between the source of sound and the listener
frequency
number of wave pulses per second
period
time taken for one complete wave pulse
wavelength
distance between two successive points in phase
doppler effect uses
detect a foetal heartbeat measure the rate of blood flow
red shift
when a star moves away from the earth, the light waves behind the star increase, causing a shift of the light towards the red end of the spectrum
weight
gravitational force exerted by the earth on an object or near its surface
newton law of universal gravitation
each body in the universe attracts every other body with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres