Machines
Work/ Power
Levers/ Inclined Planes
Pulley/ Wedge
Wheel & Axle/ Screw
100
What is any device that completes a task and makes work easier called?
Machine
100
What is the metric unit for Work?
Joule
Newton meter
100
The fixed point that the lever pivots or rotates around is called a _________.
fulcrum
100
Identify the type of pulley:
Pulley system
100
The wheel and axle is made up of two parts: the wheel that turns on a post, which is called the __________.
Axle
200
_____________ is the rate at which work is done.
Power
200
What is the SI unit for Power?
Watt
Joule/sec
200
A in a wheelbarrow, heavy items placed in the wheelbarrow are the load. The axle is the fulcrum, and the force is applied at the handles. What class of lever is a wheelbarrow?
Second class lever
200
A wedge is a double inclined plane that does not move. True or False?
False
200
A ___________ is an inclined plane wrapped around a cyclinder.
screw
300
The output work for a machine cannot be greater than the input work because some of the energy is converted to other forms because of __________________.
Friction
300
What is the formula to calculate power?
Work / Time
300
Inclined planes make work easier by decreasing force but increasing distance. Is this statement True or False?
True
300
Which type of pulley has the most mechanical advantage?
A. Fixed
B. Movable
C. Pulley System
C. Pulley System
300
Screws move objects to a greater depth (or higher elevation) by increasing the force applied to the screw. True or False?
True
400
Another unit for power, typically used to express the power produced by engines in cars or boats is called ___________________.
horsepower
400
How much power is done when a person uses 330 J to move a box in 10 seconds?
33 watts
400
What class of levers have their fulcrum between input and output forces?
First Class Lever
400
If a pulley is attached to a structure and only changes the direction the force is moving, what type of pulley is it? (The pulley is stationary)
Fixed Pulley
400
Identify the simple machine in this picture:
Wheel and axle
500
The ______________ of a machine tells you the number of times the input force is multiplied by the machine. You can find this by dividing its output force by the input force.
Mechanical advantage
500
A log is pushed across the floor for a distance of 3 meters with a force of 300 Newtons in 3 seconds. Calculate the power required to do the task.
300 watts
500
Inclined planes have no moving parts, but they are not 100% efficient. How can we reduce friction and increase the inclined plane’s efficiency?
Using lubricants, such as oil, or trying to find the smoothest surfaces possible can reduce friction and increase the inclined plane’s efficiency
500
What is the mechanical advantage of this pulley system?
8
500
What is a machine made up of two or more simple machines called?
Compound Machine