7th Grade 1st Semester Final Exam Review

Front

What happens to energy when friction occurs between two surfaces?

Back

Energy transforms into heat, increasing temperature due to particle movement.

Front

What happens to an object's kinetic energy when its speed is doubled?

Back

It becomes four times greater.

Front

What is the mathematical relationship between kinetic energy and speed?

Back

Kinetic energy is proportional to the square of speed.

Front

During a collision between two objects, which statement is ALWAYS true?

Back

The objects make physical contact.

Front

What factor does NOT affect an object's elastic limit?

Back

The object's color.

Front

Define kinetic energy.

Back

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

Front

What is the formula for calculating kinetic energy?

Back

Kinetic energy (KE) = 1/2 mv², where m is mass and v is velocity.

Front

Explain the concept of elastic limit.

Back

The elastic limit is the maximum extent to which a solid can be stretched without permanent deformation.

Front

What is the difference between potential energy and kinetic energy?

Back

Potential energy is stored energy based on position, while kinetic energy is energy of motion.

Front

What happens to the temperature of an object when it experiences friction?

Back

The temperature increases due to the conversion of kinetic energy into thermal energy.