8th First Semester Final 24/25

Front

What happens to the kinetic energy of molecules when thermal energy is removed from a liquid?

Back

The kinetic energy of the molecules decreases, and they slow down.

Front

What describes the flow of energy when a chilled lemonade pitcher is left in a warmer room?

Back

Heat energy flows from the room to the lemonade until the lemonade and the room are the same temperature.

Front

During which time period is a racehorse moving at the fastest speed according to a graph?

Back

4-6 seconds.

Front

Which graph illustrates constant speed and velocity?

Back

Graph B.

Front

What hypothesis is being tested when identical cars roll down wooden ramps?

Back

The height of the ramp affects the speed of the car.

Front

Define thermal energy.

Back

Thermal energy is the total kinetic energy of particles in a substance, related to temperature.

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion.

Front

Explain the concept of heat transfer.

Back

Heat transfer is the movement of thermal energy from one object to another due to a temperature difference.

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

Front

What is the principle of conservation of energy?

Back

The principle of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.