Work Motion & Power Vocabulary

Question 1

Work

Answer 1

The effort we extend on a certain job

work only occurs when a force succeeds in moving an objects in the direction of the acting force

work (foot pounds) = force (lbs) x distance (feet)

w = fd

Question 2

Mechanical energy

Answer 2

the “go” of things

the amount of work an object can do

Question 3

potential energy

Answer 3

energy of position

the amount of work an object can do by returning to an original position

example: a jack-in-the-box has potential energy in a coiled spring. Potential energy is then released and we see kinetic energy as the box pops open and the surprise springs out

Question 4

gravitational energy

Answer 4

gravitational energy is energy associated with gravity

It is the potential energy stored by an object because of its higher position compared to a lower position. (e.g. if it’s further away or closer to the ground).

Question 5

kinetic energy

Answer 5

the energy of a moving body in any direction

depends on the weight and the velocity of the object

kinetic energy (ft. lbs) = weight (lbs) x velocity ^ 2 (ft/sec)
___________________________________________
64

KE = mv^2 / 64

Question 6

power

Answer 6

the rate at which work is accomplished

the faster the work is accomplished, the more power is needed

Question 7

horsepower

Answer 7

James Watt measured the rate at which a horse could work and found it to be 550 ft-lb per second.

power (horsepower) = work (ft-lb)

Question 8

1 horsepower is equal to how many watts?

Answer 8

746 watts of electrical power

Question 9

Horsepower equation

Answer 9

motor watt / 746

Question 10

Dynamometer

Answer 10

an electrical test instrument used to measure horse power