Forces and Energy Unit Test Review

Which refers to the thermal energy that flows from one substance to another when the substances differ in temperature?

• heat

• temperature

• convection

Nuclear reactions in a reactor produce a lot of thermal energy. That energy then flows and warms up water, which boils and produces steam. The steam then turns turbines that generate electricity.

Which statement below can be made about the production of electricity in a nuclear reactor?

• heat flows in the form of electricity

• heat flows from the reactor to the water

• the water produces heat

A stovetop burner on medium reaches 95°C. Which will also receive a flow of heat directly from the burner?

• the surrounding air

• a burner at the same temperature

• a pan heated at 100 degrees Celsius

Heat transfer between two substances is affected by specific heat and the

• chemical composition of the substances

• thermal equilibrium of the substances

• amount of time and area of physical contact between the substances

Which of these results in kinetic energy of an object?

• position

• motion

• mass

Carmen is heating some water and trying to measure the temperature of water using a Celsius thermometer. Which measurement can she expect once the water begins to boil?

• 32 degrees Celsius

• 100 degrees Celsius

• 212 degrees Celsius

Which shows the formula for converting from degrees Celsius to degrees Fahrenheit?

• °F = (9/5 × °C) +32

• °F = 5/9 × (°C – 32)

• °F = °C – 273

Which set of terms best defines what affects kinetic energy and potential energy, respectively?

• position, gravity

• gravity, velocity

• velocity, height

Seema knows the mass of a basketball. What other information is needed to find the ball’s potential energy?

• the volume and height the ball reaches

• the volume and shape of the ball

• acceleration due to gravity and the height the ball reaches

If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?

• Total energy increases.

• Stored energy decreases.

• Energy of motion decreases.