Formulas
Vocabulary
Lesson 1
Lesson 2
Lesson 3
100
True or False? The equation for MA is input force divided by output force.
False, the equation is output force divided by the input force.
100
True or False? Power is the rate at which work is done.
True, power is the rate at which work is done.
100
True or False? Work is in joules.
True, work is in joules.
100
True or False? A machines efficiency can be 100%.
False, because of friction a machines efficiency has to be lower than 100%.
100
True or False? There are 7 different types of simple machines.
False, there are 6 different types of machines.
200
What is the formula for efficiency?
The formula for efficiency is efficiency= output work divided by input work multiplied by 100%
200
What is an inclined plane?
An inclined plane is a flat, sloped surface.
200
What does work transfer?
Work transfers energy.
200
What is the material used to increase efficiency?
The material is called lubricant.
200
What simple machine is a screwdriver?
A screwdriver is a wheel and axle.
300
What is the formula you do find the IMA for a lever? A- length of input arm divided by length of output arm B- output force divided by input force C- work divided by time
The correct answer is A, to find the IMA you must take the length of the input arm and divided it by the length of the output arm.
300
What is the definition for wedge? A- an inclined plane wrapped around a cylinder B- a flat sloped surface C- a sloped surface that moves
The correct definition for wedge is C, a sloped surface that moves.
300
What else can you call a newton-meter. A- meter B- joule C- newton
The correct answer is B, a joule is also know as a newton-meter.
300
What is a machine? A- any device that makes something easier B- a device that decreases the amount of work you have to do C- a device that will not help you complete a task
The correct answer is A, any device that makes something easier.
300
What is the fulcrum a fixed point on? A- wheel and axle B- pulley C- lever
The correct answer is C, a fulcrum is a fixed point on which a lever rotates.
400
What is the MA for a fixed pulley, a movable pulley, and a pulley system.
The MA for a fixed pulley is 1. The MA for a movable pulley and a pulley system is 2.
400
What are your three body parts a lever is like?
Your neck, foot, and arm are examples of levers in your body.
400
What is the units used for power, work, and time to find power.
The unit used for power is watts. The unit used for work is joules. The unit used for time is seconds.
400
What are the three ways a machine makes work easier?
A machine makes work easier by changing the size of force needed, changing the distance in which a force acts, and changing the direction of force.
400
What are the three types of levers?
The three types of levers are first-class lever, second-class lever, and third-class lever.
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