GQ1: Energy
The ability to do work or cause change.
What is Energy?
State the law of conservation of energy.
What is Energy can neither be created nor destroyed, only converted from one form to another?
Name the three types of waves.
What is Transverse, Longitudinal, and Surface?
Sound is a disturbance which travels through a medium as a ____ wave.
What is longitudinal?
Using a whiteboard, draw a transverse wave.
*Teacher will judge - should have crests and troughs!
Define kinetic energy.
What is the energy of motion?
Work is the transfer of energy, and all forms of energy have the ability to do work. State the equation that is used to calculate work.
What is
work = force x distance
?
Name the 4 types of interactions of waves.
What is reflection, refraction, diffraction, and interference?
Sound waves reflect off objects, diffract through narrow openings and around barriers, and interfere with each other.
When a sound wave reflects off a surface, the reflected sound wave is called an ___.
What is an echo?
On a whiteboard, draw a pendulum swinging and label at which point(s) it has potential energy and at which point(s) it has kinetic energy.
*Teacher will judge - maximum kinetic energy at middle and maximum potential energy at high points
A ball at the top of a hill has ____ energy.
What is Potential?
Define power.
What is the rate at which work is done?
Define reflection.
What is when a wave bounces off a surface through which it cannot pass?
Light rays obey the law of reflection. State what the law of reflection is.
What is the angle of reflection equals the angle of incidence?
Using a whiteboard, draw a longitudinal wave.
*Teacher will judge - it should look like a slinky!
A ball that has reached the bottom of the hill but is still rolling has ___ energy.
What is Kinetic?
You push a box a distance of 15m with a force of 30N. How much work (in joules) have you done on the table? Use the equation for calculating work!
What is 450 joules?
Explain the meaning of interference of waves.
What is when two or more waves meet and have an effect on each other?
Also acceptable:
What is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude?
Light bends when it enters water at an angle, because one side of the wave slows down before the other side due to the difference in density between the air and the water. This causes the light to bend as it passes through the water. This is an example of ______.
What is Refraction?
An example of thermal energy is boiling a pot of water on the stove. Draw a pot of boiling water and label which portions represent convection, conduction, and radiation.
*Teacher will judge -
Convection is the current in the boiling water as the hot water rises
Conduction is the heat transferring to the metal handle, making it hot to the touch
Radiation is the heat transfer from the stove top with a high temperature to the air surrounding it with a lower temperature
State the 6 forms of energy and give an example of each kind.
What is chemical, nuclear, electromagnetic, thermal, mechanical, and electrical?
State the second law of thermodynamics.
What is
"Energy moves from more useful forms to less useful forms. Conversion of heat energy always leaves some energy as heat."
?
Name the four properties of waves.
What is amplitude, frequency, wavelength, and speed?
The speed of sound depends on the elasticity, density, and temperature of the medium the sound travels through. Explain why sound moves more slowly in colder temperatures.
What is the particles of the medium move more slowly when they are cold, making them more difficult to move?
Using a whiteboard, draw a diagram representing a light wave that is diffracting as it passes through a doorway, moving from a lit room to a dark room.
*Teacher will judge - wave should pass through a small barrier and then spread out in V shape