Module 8 Test Flashcards
What does the power of a machine mesaure?
its rate of doing work
Describe two ways a machine can make work easier for you.
by increasing or magnifying the force you apply; by changing the direction of your force
Work is done when what takes place?
force and motion are in the same direction
What type of machine is a ramp?
inclined plan
What is the formula for gravitational potential energy?
An ax is an example of what type of simple machine?
wedge
Knowing the input distance and the output distance of a machine, allows you to calculate what?
ideal mechanical advantage
What increases when an object becomes warmer?
thermal energy
What is the formula for work?
When is work not done?
when the force is not in the direction of the object’s motion
Name a unit of work
joule
What is the formula for power?
What is the energy that is stored due to position or shape called?
potential energy
Why is the efficiency of a machine always less than 100%?
some work input is lost to friction
Work can be defined as the transfer of?
energy
Give three statements according to the law of conservation of energy
energy cannot be created, energy cannot be destroyed, energy can be converted from one form to another
What kind of energy is stored in gasoline?
chemical energy
What is the SI unit of power?
watt
What is the formula for IMA?
What does gravitational energy depend on?
its mass, the acceleration due to gravity, and its height relative to a reference level
What is the formula for kinetic energy?
What is the energy of motion called?
kinetic energy
