Work
In order for you to do work on the object, the object must...
What is move a distance and in the direction of the force?
The equation for efficiency.
What is efficiency equals output work divided by input work times 100%?
What is the fulcrum?
Work done when a 30 N book is lifted 2 m.
What is 60 J?
What is inclined plane, wedge, lever, wheel and axle, screw and pulley?
Equation for work.
What is W=Fd?
This causes a machine to be less efficient
What is friction?
A machine with 2 or more simple machines.
What is a compound machine?
Efficiency of a machine that uses 4000 J to do 3000 J of work.
What is 75%?
The definition of a machine.
What is a device that makes work easier or more effective?
Unit of Work
The definition of efficiency.
What is the ratio of the output work to the input work on a machine? or What is how well a machine uses the input work?
An example of a compound machine.
IMA of a 8 m long ramp that is 2 m high.
What is 4?
The IMA of a screw.
What is the Circumference of the screw divided by the distance between the threads (pitch)?
To do work, this must be true of the force and distance.
What is be in the same direction?
An ideal machine would have this efficiency.
What is 100%?
2 examples of simple machines in the body?
What is... (teacher will determine if answer is correct)?
IMA of a wheel that has a radius of 20 cm, with an axle whose radius is 4 cm.
What is 5?
The 3 ways a machine makes the work easier.
What is change the force, change the distance, change the direction?
The work done when a person pushes 80 N to move a 40 N box a distance of 9 m.
What is 720 J or 720 Nm?
The efficiency of a lightbulb that gives off 200 J of work while it uses 500 J of energy.
What is 40%?
The reason why we cannot calculate the actual mechanical advantage ahead of time.
What is friction and other flaws in the machine that affect mechanical advantage?
IMA of a wheelbarrow whose handle is 4 ft away from the wheel, and the load is 0.5 ft from the wheel.
What is 8?
The three classes of levers, what's in the middle and an example of each.
What is... (teacher will determine if the answer is correct)?