A(n) is a pure substance that is made of only one kind of atom. the symbol for a(n) is always one or two letters. when the symbol contains two letters, the first letter is always and the second letter is always

Match the words or actions and their definition. 1. the rate of doing work 2. a machine that changes motion 3. the force that is used to generate electricity 4. 550 foot-pounds per second 5. the force that makes things fall toward the earth 6. work in > work out 7. metric measurement of work 8. the product of force times distance water falling from a dam newton-meter gravity work windmill power the work principle 1 horsepower