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

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