Cats
If a person is holding a book and not moving, are they doing work?
No
This simple machine is a movable inclined plane.
A wedge
Radiation is the transfer of heat through electromagnetic rays
What is the definition of energy?
the ability to do work or the ability to move matter or change matter
How many types of simple machines exist?
6
What is conduction?
Conduction is the transfer of heat from a warmer object to a cooler object through direct contact.
A couch is pushed with a force of 75 N and moves a distance of 5 m across the floor. How much work is done moving the couch?
375 J
A __________ is a grooved wheel with a rope, chain, or cable in the groove.
pulley
Name an activity that would use a lever
See saw, lifting, etc.
Does a machine multiply energy?
No
A book sliding across a horizontal table slows down and comes to a stop. The book's kinetic energy was converted into what form of energy?
Potential
True or False: Heat is defined as the transfer of thermal energy from a warmer to a lower temperature.
True
The energy stored in a compressed spring is known as ______________.
elastic potential energy
A lawn mower is pushed with a force of 80 N. If 1200 J of work are done in mowing a lawn, what is the total distance the lawn mower was pushed?
15 m
What is Convection?
Convection is the transfer of heat through the movement of a fluid.
Potential energy is also known as ________ energy.
stored
What is the definition of work?
the use of force to move an object
The power produced by an electric motor is 500 watts. How long will it take the motor to do 10,000 J of work?
20 s
Kinetic energy is the energy of an object that is _______.
moving
_________ is the rate at which work is done or energy is transferred.
Power
What is the middle of a lever called?
fulcrum
What force almost always exists?
friction
Friction causes mechanical energy to be transformed into which form of energy?
Thermal Energy
What is the measure of how well a machine works?
efficiency
A student walks to school at a speed of 1.2 m/s. If the student's mass is 53 kg, what is the student's kinetic energy?
38.16 J