CIS-PR 8th Grade Review

Front

Kinetic energy is the energy an object has due to its

Back

Motion

Answer explanation

Kinetic energy is defined as the energy an object possesses due to its motion. Therefore, the correct answer is 'Motion', as it directly relates to the movement of the object.

Front

What will happen to the kinetic energy if you double the mass?

Back

The kinetic energy would double

Answer explanation

Kinetic energy (KE) is given by the formula KE = 1/2 mv². If you double the mass (m), the kinetic energy also doubles, assuming the velocity (v) remains constant. Thus, the correct answer is that the kinetic energy would double.

Front

How do mass and speed relate to kinetic energy?

Back

As mass and speed go up, the kinetic energy of an object increases

Answer explanation

Kinetic energy increases with both mass and speed, as described by the formula KE = 1/2 mv². Therefore, as mass and speed go up, the kinetic energy of an object increases, making this the correct choice.

Front

Kinetic energy can be calculated from what two measurements?

Back

Velocity and mass

Answer explanation

Kinetic energy is calculated using the formula KE = 1/2 mv², where m is mass and v is velocity. Therefore, the correct measurements needed are velocity and mass.

Front

At which point would the motorcycle have the greatest potential energy?

Back

A

Answer explanation

The motorcycle has the greatest potential energy at point A because potential energy is highest at the highest elevation. Point A is likely at a higher altitude compared to point B.

Front

What kind of energy is in a moving skateboard?

Back

Kinetic

Answer explanation

A moving skateboard possesses kinetic energy, which is the energy of motion. Potential energy, on the other hand, is stored energy based on position. Since the skateboard is in motion, the correct answer is kinetic.

Front

What kind of energy is in a rock at the edge of a cliff?

Back

Potential

Answer explanation

The rock at the edge of a cliff has potential energy due to its height above the ground. This energy can be converted to kinetic energy if the rock falls, but at the edge, it is primarily potential energy.

Front

Which is the best example that something has kinetic energy?

Back

A tennis ball rolling across the court.

Answer explanation

Kinetic energy is the energy of motion. A tennis ball rolling across the court is in motion, thus it possesses kinetic energy. In contrast, the other options are stationary or not in motion.

Front

When a pendulum swings, at which point is kinetic energy highest?

Back

At the lowest point of the swing.

Answer explanation

The kinetic energy of a pendulum is highest at the lowest point of its swing, which is point 3. At this position, the pendulum has converted all its potential energy into kinetic energy, resulting in maximum speed.

Front

Which runner stopped for a rest?

Back

Charlie

Answer explanation

Charlie is the runner who stopped for a rest, as indicated by the context of the question. Albert and Bob did not stop, making Charlie the correct choice.