Ch 11 Lesson 3--Work and Energy

work

Energy used to move something a distance. Example: I did __ when I lifted the box upward.

energy

The ability to do work or cause change. Example: The battery stored __ for the flashlight.

joule

A unit for work and energy. Example: The meter showed one __ of energy used.

newton-meter

Another name for a joule of work. Example: One __ equals one joule of work.

positive work

Work done in the same direction as motion. Example: Pushing forward did __ on the rolling cart.

negative work

Work done opposite the motion. Example: Pulling backward did __ and slowed the wagon.

total work

The sum of positive and negative work by all forces. Example: The __ was zero, so speed stayed steady.

potential energy

Stored energy from position or structure. Example: At the top, the ball had __.

kinetic energy

Energy of a moving object. Example: The rolling marble had __ down the ramp.

chemical energy

Energy stored in substances like food or fuel. Example: Breakfast gave __ for my morning run.

electrical energy

Energy from electric charges. Example: The wire carried __ to the motor.

heat

Energy from moving particles. Example: Rubbing my hands made __ that warmed my fingers.

sound

Energy carried by vibrating waves. Example: The drum made __ that traveled across the room.

light

Energy that travels in waves we can see. Example: The lamp gave __ so I could read.

law of conservation of energy

Energy changes form but is not destroyed. Example: The coaster followed the __ all day.

periodic motion

Motion that repeats in a cycle. Example: The swinging toy showed __ back and forth.

nuclear energy

Energy stored inside the nucleus of an atom. Example: The Sun releases __ every second.

magnetic energy

Energy from magnets that can push or pull. Example: The magnet’s __ moved the nail closer.

electricity

Kinetic energy of moving electrons. Example: The fan ran when __ flowed through the cord.

undesirable work

Work that happens but is not helpful. Example: Loud noise can be __ during an experiment.