Energy Review

Which object shows an energy transformation from electrical to mechanical?

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When a car burns gasoline it creates hot air to move the pistons in the engine, which causes the car to move. What energy transformation occur from the fuel to the movement of a car?

• thermal energy to mechanical energy

• thermal energy to chemical energy to mechanical energy

• chemical energy to thermal energy to mechanical energy

• chemical energy to electrical energy

When you drop a basketball it does not bounce back all the way. This is because some of the mechanical energy is 'lost' when it transforms into which of the following ?

• Sound

• Chemical

• Radiant

• Hamster

Some students observing a classroom device being used, noticed the below energy transformations. 
Electrical → Mechanical → Sound
Which device were the students most likely observing?

• A triple beam balance measuring an object’s mass.
• A pencil sharpener plugged into a wall outlet.
• A projector displaying a diagram on the screen.
• A working flashlight used to light up a dark corner.

Potential energy is _____ proportional to the _____ of an object.

• inversely, mass

• inversely, height

• directly, speed

• directly, height

If we double (x2) the height of an object, its potential energy will...

• quarter (x1/4)

• halve (x1/2)

• double (x2)

• quadruple (x4)

What is the correct unit for energy?

• meters (m)

• kilogram meters per second (kg m/s)

• Newtons (N)

• Joules (J)

The faster an object moves, the ________ kinetic energy it has. 

• more
• less
• none of the above
• all of the above 

Heat transfers from an area of ____temperature to an area of ___ temperature.

• high to low
• low to high
• high to high
• It can travel high to low and low to high. 

In which of the following state are the particles closest together?

• Fluid

• Gas

• Liquid

• Solid