7th Grade 1st Semester Final Exam Review

Front

What is kinetic energy?

Back

Kinetic energy is the energy an object possesses due to its motion. It is calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

Front

How does kinetic energy relate to collision damage?

Back

More kinetic energy causes more damage during a collision.

Front

What is the relationship between mass and force needed to accelerate an object?

Back

More mass requires more force to accelerate an object, according to Newton's second law of motion (F = ma).

Front

What is the mathematical relationship between kinetic energy and speed?

Back

Kinetic energy is proportional to the square of the speed (KE ∝ v²).

Front

What happens during a collision?

Back

Forces act between the colliding objects, and their motion may change, but damage does not necessarily occur.

Front

What causes a change in shape during a collision?

Back

A change in shape during a collision is caused by force.

Front

What is the formula for calculating kinetic energy?

Back

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

Front

What is Newton's second law of motion?

Back

Newton's second law states that the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma).

Front

What is the principle of conservation of momentum?

Back

The principle of conservation of momentum states that the total momentum of a closed system remains constant if no external forces act on it.

Front

What is the difference between elastic and inelastic collisions?

Back

In elastic collisions, both momentum and kinetic energy are conserved. In inelastic collisions, momentum is conserved, but kinetic energy is not.