8th Grade Science - Energy of Objects in Motion XT_19 - 20

_________ is the ability to do work.

• A) Ability

• B) Energy

• C) Work

• D) Physics

_________ energy is described as energy in motion.

• A) Gravitational potential

• B) Elastic potential

• C) Sound

• D) Kinetic

Which object will have more kinetic energy?

• A) An empty, stationary coffee cup sitting on a table 2 m off the ground.

• B) A sports car driving down the road at a speed of 20 m/s.

• C) A hummingbird hovering in the air 10 m off the ground.

• D) The Empire State Building.

Which object will have the most potential energy?

• A) An empty, stationary coffee cup sitting on a table 2 m off the ground.

• B) A sports car driving down the road at a speed of 20 m/s.

• C) A hummingbird hovering in the air 10 m off the ground.

• D) The Empire State Building.

Which object will have the most gravitational potential energy?

• A) A boulder resting on the ground on Earth’s surface.

• B) A boulder resting on the ground on the Moon’s surface.

• C) A baseball 5 m above the Moon’s surface.

• D) A baseball 5 m above Earth’s surface.

A girl has two identical springs. She stretches the first spring 0.5 m while compressing the second spring

0.5 m. What is true about the springs?

• A) The first spring will have more EPE than the second one.

• B) The second spring will have more EPE than the first one.

• C) Both springs will have the same amount of EPE

• D) It is impossible to tell which spring will have more EPE than the other.

Which of the following is NOT a type of non-mechanical energy?

• A) wind

• B) thermal

• C) sound

• D) chemical

When will a girl on a swing experience the greatest amount of gravitational potential energy?

• A) On her way down while in mid-swing.

• B) At her maximum height while in mid-swing.

• C) On her way up while in mid-swing.

• D) At her lowest height while in mid-swing.

When will a girl on a swing experience the greatest amount of kinetic energy?

• A) On her way down while in mid-swing.

• B) At her maximum height while in mid-swing.

• C) On her way up while in mid-swing.

• D) At her lowest height while in mid-swing.

Calculate the kinetic energy of a baseball moving at a velocity of 32 m/s west with a mass of 2.4 kg.
 $KE\ =\ \left(\frac{1}{2}\right)\ \cdot\ m\ \cdot\ v^2$ 

• A) 38.4 J

• B) 76.8 J

• C) 1,228.8 J

• D) 2,457.6 J