LEVEL 1
What is Efficiency?
The measurement of the amount of work used compared to the amount of energy used in a process
What is Friction?
The force which resists motion between 2 objects in contact with each other.
What is a example of a Lubricant?
Oil or grease (Engine Oil)
What is Lost Energy?
Energy which has escaped from a functioning system.
What is Output work?
The amount of useful work a machine does
Fill in the blank:
Efficient machines use less ------ as it does work
Heat
True or False
Efficiency is getting the most output with the least input possible
TRUE
Fill in the blank:
Eficient machines use minimal ------- between the moving parts
Friction
True or False?
Energy can be lost in a system when energy is not transformed from its original form to another form.
FALSE
Energy can be lost in a system when energy IS transformed from its original form to another form.
What is the unit to measure Work?
Joules
What is a force?
A push or pull.
What is the formula for Efficiency?
W. out x 100% / W. in
What is a lubricant?
A substance that is set between 2 sliding surfaces to decrease friction
What is input work?
The input work is the work you put in to create an outcome
What are the 2 main types of Friction?
Static Friction and Sliding Friction
What does friction allow us to do in our daily lives?
Walk, write, or apply brakes to a moving vehicle.
What is the definition of Sliding Friction?
The force that acts against movement and causes the objects to stop.
What are the 6 main simple machines?
Lever, Screw, Wheel and Axle, Pulley, Wedge, and Inclined Plane
What is the definition of Static Friction?
The force that prevents surfaces at rest from sliding against one another.
What is the useful output work of a bike?
To move around or provide transportation.
Explain how input work and output work is shown in the function of a keyboard.
Input- Typing on the keyboard
Ouput- You see what you wrote on the screen of the device.
Explain the Input and Output work on a bike.
Input- The person moving the pedal
Output- The bike moving
Where does the Force of Friction occur in a pully?
Where the pulley wheel rotates on its shaft
What is a ideal machine?
A machine which can function without any friction between its moving parts.
What is the definition of a machine?
A machine is a device that can modify force or increase the quantity of motion from force.