Vectors
a quantity that has only magnitude and no direction
scalar
a vector whose length is the shortest distance from the initial to the final position
displacement
what is the name of the law that says:
when the resultant force acting on an object is zero, the object will remain at rest or in uniform motion
Newtons First Law of Motion
Units for work
J
A wave is a transfer of:
energy
a quantity in physics that has both magnitude and direction
vector
What is the gradient equal to on a displacement versus time graph?
instantaneous velocity
the quantity of motion of a moving body, measured as a product of its mass and velocity
momentum
What is the formula that relates work and Force?
W = Fs
what is the distance between successive, identical points of a wave
wavelength
Examples of Scalar Quantities
distance, speed, energy, length, temperature, time
What is the area under a velocity time graph?
displacement
the change of momentum of an object when the object is acted upon by a force for an interval of time
impulse
What is the type energy an object posses due to its motion (E = 0.5 x m x v2)
Kinetic energy
the time taken for one full wave cycle
Examples of Vector Quantities
displacement, velocity, momentum, acceleration, force
Draw a s-t graph that shows a constant velocity of -2.0 m/s
TLO to demo on board!
what is the law called that says:
momentum before a collision will be the same as the momentum after a collision
Conservation of momentum
What is the law called that means that the total energy in a system is constant?
Law of Conservation of Energy
what is the wave equation?
v = fλ
TLO to do on the board
Flat line on a velocity time graph shows?
what is constant velocity or no acceleration
What does the area underneath a force - time graph show?
impulse (aka. change in momentum)
How much work is done when Bowey holds a 100 kg weight over his head at 1.5 m high?
No work, the object is not moving
Determine the velocity of a wave if 20 wavelengths are 140 m long and take 40 s to pass a stationary point. Show your working:
v = 0.5 x 7 = 3.5 m/s