Semester 2 review 2023

The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed

• Energy cannot be created or destroyed, it can only transformed

• Energy can't be created, destroyed or transformed

• Energy cannot be created or destroyed.

What kind of energy does an object possess when it's resting on top of the hill?

• Potential Energy

• Chemical Energy

• Kinetic Energy

• All of the above

How do you know if something has kinetic energy or not?

• If it moves, it has kinetic energy.

• If it has mass, it has kinetic energy.

• If it has high speed, it has potential energy.

• If it moves, it has potential energy.

What is the formula for Kinetic Energy?

• KE = mass x velocity

• KE= 1/2 x mass x velocity ²

• KE = mass x gravity x height

• KE = mass x velocity / 2

What energy transformation occurs from a light bulb?

• Electrical energy => kinetic energy + potential energy

• Electrical energy ==> electrical energy

• Electrical energy ==> chemical energy

• Electrical energy ==> light energy + thermal energy

The law of conservation of energy says the total energy before the change _______ the total energy after it

• is less than

• is more than

• affects

• equals

Which 2 letters have the most kinetic energy?

• W & Y

• X & Z

Roller coasters slow down because their energy disappears.  

• True 
• False

Which form of energy is represented in this image?

• kinetic

• thermal

• potential

• radiant

What happens when the ball goes from the highest position to the lowest position

• PE and KE increases and decreases together

• Impossible to know without knowing the mass of the object

• the PE decreases while KE increases