Units
What is the standard unit of distance?
metre
What is energy?
The ability to make things happen.
What energy change happens in a light bulb?
➡️ Answer: Electrical → light (and heat)
What does GPE stand for?
➡️ Answer: Gravitational potential energy
What word describes an idea or prediction that can be tested?
Hypothesis
What is the standard unit of time?
second
What kind of energy is stored in food?
➡️ Answer: Chemical energy
What two energy changes happen in a battery-powered torch?
➡️ Answer: Chemical → electrical → light
What two factors affect an object’s gravitational potential energy?
➡️ Answer: Mass and height
What term is used to describe the various factors in an experiment that have the potential to change?
VARIABLE
What is the unit of energy?
Joule
What kind of energy does a moving car have?
➡️ Answer: Kinetic energy
What two energy changes happen when you burn fuel in a car engine?
➡️ Answer: Chemical → thermal → kinetic
A ball falls from a shelf. As it falls, what happens to its GPE and KE?
➡️ Answer: GPE decreases, KE increases
What name is given to the variable that is measured in an experiment?
dependent
How many joules in 11.2 kilojoules?
11,200 joules
Which form of energy increases as an object is lifted into the air?
Gravitational potential energy
Describe the main energy changes when a person eats food and runs.
➡️ Answer: Chemical → kinetic (and thermal)
What is the energy required to lift a 10 kg box onto a shelf 2 meters above the ground on Earth? Hint use GPE = mgh
200 J
What term is used to describe the variables that are held constant to ensure the experiment remains fair?
control
What is the value and unit of the variable g in the formula GPE=mgh?
10 m/s2 OR N/kg
What is the formula for Mechanical energy?
In a hydroelectric power station, what are the main 2 energy transformations?
➡️ Answer: Gravitational potential → kinetic → electrical
The amount of kinetic energy, in joules, possessed by a 100 g pendulum at its lowest point, assuming it is released from a height of 10 cm and all potential energy is converted to kinetic energy, neglecting friction. (g=10)
0.1 kg x 10 x 0.1 = 0.1 J
At the conclusion of an experiment, an experimenter can take one of two actions regarding the hypothesis. What are these two possible actions?