The work done on a machine; the product of the input force and the distance through which the force is exerted.
100
What is mechanical efficiency?
ME= its is expressed as a percent and measures the ratio of the work output to the work input.
100
What is mechanical advantage?
A number that tells how many times a machine multiplies forces.
100
Suppose that you exert 60N on a machine and the machine exerts 300N on another object. What is the machine's mechanical advantage?
MA= 300N / 60N= 5
200
What is a lever?
A simple machine that creates a mechanical advantage.
200
True or False: The work output of a machine can never be greater than the work input?
True
200
True or False: Mechanical advantage compares the input force with the output force?
False, it compares the output force to the input force
200
What is the mechanical efficiency of a machine whose work input is 100J and work output is 30J?
ME= 30J / 100J x 100= 30%
300
What is work output?
The work done by a machine; the product of the output force and the distance through which the force is exerted.
300
How is mechanical efficiency calculated?
mechanical efficiency= work output / work input x 100
300
If the mechanical advantage of a machine is 5, how does the output force compare with the input force?
The output force is 5 times greater than the input force.
300
A grocer uses a handcart to lift a heavy stack of canned food. Suppose that he applies an input force of 40N to the handcart. The cart applies an output force of 320N to the stack of canned food. What is the mechanical advantage of the handcart?
MA= 320N / 40N= 8
400
How do machines make work easier?
Machines make work easier by allowing force to be applied over a greater distance and it makes the work easier for the person because they do not need to apply as much force.
400
What is an example of an ideal machine?
An ideal machine would be a machine that had 100% mechanical efficiency.
400
What is the formula for mechanical advantage?
mechanical advantage= output force / input force
400
A lever allows a 35N load to be lifted with a force of 7N. What is the mechanical advantage of the lever?
MA= 35N / 7N= 5
500
What are two things that a machine can change about how work is done?
Machines change the force or the distance through which force is applied.