Work, Power, Energy CONCEPTUAL

What has to happen when a force is exerted on an object for work to be done?

• the object moves
• the object stays still
• the object is heavy
• none of these

Tags

NGSS.HS-PS3-1

What is power?

• work per unit time
• force per unit distance
• total energy used
• force over a time interval

During a science project, Julia and Tom measured the kinetic energy of a moving car. What is kinetic energy?

• stored energy

• energy of motion

• energy of friction

• energy stored in chemical bonds

Tags

NGSS.HS-PS3-2

During a science project, Malic and Allison are discussing how to express the total amount of energy a moving object has. How do they express it?

• KE x PE

• KE + PE

• KE - PE

• KE / PE

Tags

NGSS.HS-PS3-2

Maddie is studying physics and wonders what type of energy represents the sum of the KE and PE that a moving object has. Can you help her?

• chemical energy

• total mechanical energy

• electromagnetic energy

• electrical energy

When a roller coaster cart, enthusiastically ridden by Derik and Olivia, falls towards the ground, what happens to its potential energy?

• Increases

• Decreases

• Stays the same

• Nothing

Tags

NGSS.MS-PS3-2

When a rollercoaster cart, which Keira and Matt are riding, moves towards the ground, what happens to the PE that it has?

• It transforms into KE

• It leaves the system

• Nothing

• It stays PE

Tags

NGSS.HS-PS3-3

What is the kinetic energy of a ball sitting on top of a hill that Yaman and Allison are observing?

• 0 J

• less than 0 J

• more than 0 J

Charlie and Yaman are discussing the Law of Conservation of Energy. They agree that the total amount of energy in a closed system will always

• stay the same

• increase

• decrease

• cannot be determined

Tags

NGSS.HS-PS3-3

NGSS.HS-PS3-4

Based on the formula for potential energy, what 2 variables influence PE the most? Chris and Damonjay are working on a science project to understand this better.

• mass and height

• mass and velocity

• velocity and height

• velocity and mass