7th Grade Science 2nd 9 Weeks Review

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or state. It has the potential to be converted into kinetic energy.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object in motion. It depends on the mass of the object and its velocity.

Front

What is the formula for calculating average speed?

Back

Average speed is calculated using the formula: S = d/t, where S is speed, d is distance, and t is time.

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 energy conversion?

Back

Energy conversion is the process of changing energy from one form to another, such as converting chemical energy from food into mechanical energy for movement.

Front

What is the law of conservation of energy?

Back

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

Front

What is acceleration?

Back

Acceleration is the rate of change of velocity of an object. It can occur due to a change in speed or direction.

Front

What is the unit of energy?

Back

The unit of energy is the Joule (J).

Front

What is the relationship between mass and kinetic energy?

Back

Kinetic energy increases with mass; if the mass of an object doubles, its kinetic energy also doubles if the velocity remains constant.

Front

What is mechanical energy?

Back

Mechanical energy is the sum of potential energy and kinetic energy in an object.