Discovery Education Questions + Answers
Which of the following statements is true about the law of conservation of energy?
Energy can change form but the total amount of it remains consistent.
What does the law of conservation of energy state?
Energy cannot be created or destroyed, but simply changes from one form to another.
Which of the following statements best describes scientific knowledge?
It can change over time and builds off new evidence and data.
Leah heats a sample of an unknown solid until it melts into a liquid. Which describes an example of replication related to Leah's investigation?
Raquel heats an identical sample to see if it melts at the same temperature.
What is mechanical energy?
The total amount of potential and kinetic energy in a system.
kinetic energy converts to heat by friction and combines with chemical potential energy to produce heat and light
Which sequence of energy transformation best describes what happens during the striking of a kitchen match on a rough surface?
Which statement below best explains the relationship between thermal energy and the particles of matter in an object?
as the kinetic energy of the particles increases, the thermal energy will increase
What kind of energy transformation takes place in an operating batter-powered flashlight?
chemical to light and heat
A computer simulation shows molecules of a substance moving faster and faster as one of the variables is changed. What inference can be made about which variable is acting on the substance?
heat is being added to the substance
When you swing a bat and hit a baseball, the ball flies into the outfield. What happens to the energy you used to swing the bat?
it is transferred to the baseball
A wind turbine produces electricity from what kind of energy?
mechanical
Which statement best describes thermal energy?
the increase of temperature of the particles in an object
Hillary is dropping objects that have the same volume. She is investigating how an object's mass affects its average speed as it travels to the ground. What is the independent (test) variable in her experiment?
the mass of the objects
Suppose an ice cube is dropped into a beaker of hot water. Eventually, the ice will melt and the hot water will cool. Which of the following statements best describes the water in the beaker?
the water will reach thermal equilibrium
Which statement about convection is correct?
this transfer of heat can only occur in gases and liquids
A ball rolling on a flat surface will eventually stop because its kinetic energy...
transfers to the air and floor as heat.