Energy
List 5 forms of energy
Kinetic, heat, sound, chemical, electrical, light
What is the energy source for a fridge?
Electrical energy
What is wasted energy?
TRUE or FALSE. Personal pronouns such as 'I' can be used in scientific reports
False
What is kinetic energy?
Energy held by a moving object
What is the useful form of chemical energy in a lawn mower?
Kinetic energy
Identify the wasted energy of a chainsaw
Heat and sound
Acronym for the features of a graph
SALT
What is Potential Energy?
Stored energy possessed by an object
What is the difference between energy transfers and energy transformations?
Energy transfer = energy is passed from one object to another
Energy transformation = energy is changed from one type to another
Formula for energy efficiency
Energy efficiency = useful energy output/total energy input x 100
When explaining the results of an experiment, you must: refer to the hypothesis, to background theory and....
Define the Law of Conservation of Energy
Energy can never be created or destroyed, but it can be converted from one form into another
Draw an energy transformation diagram of a treadmill (only include useful energy )
Electrical energy --> kinetic energy
Calculate the wasted energy of the electric motor that 210 J of electrical energy to 152J of kinetic energy, 37 J of heat, and 21 J to sound.
58J
What is a fair test?
When only 1 variable is changed at a time
Depending on their level of efficiency. More stars = Less energy
Draw the energy transformation diagram for a battery powered MP3 player. Include useful and wasted energy
Chemical energy --> Sound + Heat + Light
Calculate the energy efficiency: Drew's light consumes 200J of electrical energy per second. 173J of that energy is heat energy. What is the energy efficiency?
13.5%
How do you write an hypothesis? Include where the independent and dependent variables go?
If...(independent variable)... then, (dependent variable)... This is because...