Work
Force x distance = _________
Work
The amount of work done in a period of time
Power
The 6 most basic machines that help accomplish work
Simple Machines
The ability to do work
Energy
How well something is able to do useful work
Efficiency
How much work is done if it takes 50 N of force to move an object 2 m
100 J
How much power does a lightbulb have if it admits 100 J of work in 5 seconds?
20 W
Two or more simple machines make a
Compound Machine
True/False Everything has energy
True
True/False Efficiency must be less than 100%
True
Unit for work (whole word)
Joules
Unit for Power (Whole word)
Watt
Screw, Wedge, and Pulley are all
Simple Machines
Conservation of energy is
Energy cannot be creator nor destroyed
The equation for efficiency
Output work / Input work x 100%
How much work does is done to lift a 5 kg object 3 m in the air
147 J
How much work does a 50 W lightbulb do in 10 s
500 J
Name these in this order
A) a flat surface raised at an angle
B) An incline plane wrapped around itself
C) Involves a wheel w/ a rope or chain
A)Incline Plane
B) Screw
C) Pulley
Name 5 different forms of energy
Answers vary
Calculate the efficiency of a light bulb that consumes 100 J of electricity but emits 60 J of light
60%
Find the acceleration of a 5 kg object when 100 J of work is done moving the object 10 m
2 m/s2
How much power is produced from a scooter that produces 200 N of force and goes 50 m in 5 s
2000 W
Name a compound machine consisted of a 3 minimum of 3 simple machines. State the simple machines and its use on the compound machine
Answers vary
Name the 3 specific energy types we will learn the second half of this chapter
Kinetic, Potential, Mechanical
How much output work will a pulley system produced, if the input work is 200 J and the pulley is 75% efficient.
140 J