Science Review 3rd

Mechanical energy is the ―

• total of all the potential energy in an object.

• total of all the kinetic energy in an object.

• total of an object’s potential energy and kinetic energy.

• total of an object’s stored energy and potential.

Tags

NGSS.MS-PS3-4

Thermal energy always flows from ―

• hot objects to hotter objects.

• cooler objects to warmer objects.

• warmer objects hotter objects.

• warmer objects to cooler objects

When you rub your hands together really hard, what two kinds of

energy do you observe? Select TWO correct answers.

• Thermal

• Light

• Heat

• Sound

• Mechanical

Tags

NGSS.MS-PS3-5

Which action creates the most friction and thermal energy?

• Gently brushing face paint onto your cheeks

• Rubbing your bare hands together numerous times

• Rubbing your soapy hands under water

• Smoothing hand lotion on to the palms of your hands

Sid pushes a rock off his desk. What happens to the mechanical

energy of the rock as it falls?

• It increases.

• It stays the same.

• It loses kinetic energy.

• It gains potential energy.

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which objects produces light energy and thermal energy but not

sound energy?

• Computer

• Desk lamp

• Power drill

• Radio

Blake looks at the fish from above the water, and they look large.

When Blake looks at them from under the water, they look smaller.

What happens to the light as it travels from the water to the air?

• It stops

• It bends

• It reflects

• It is absorbed

Tags

NGSS.MS-PS4-2

Ben designed a model to show that light travels in a straight line.

What question could you ask Ben so you can explore the same

form of energy?

• Where was the light source?

• What color paper was used?

• What was the temperature of the paper?

• What type of table was the paper placed on?

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

When you hear sound, it has a pitch. What is change in pitch most

related to?

• How big the vibration is

• How small the vibration is

• How fast the source vibrates

• How long the source vibrates

Kahlil’s family is cooking lunch on an outdoor grill. Which things

are giving off thermal energy?

• The coals and the air

• The grill and the food

• The food and the flames

• The coals and the flames