Experiments
The part of an experiment to which all other parts will be compared.
Control
Pulley
The mechanical advantage of a 4-pulley system.
4
The thin "film" that stretches across the surface of every liquid.
Surface tension
A ramp is an example of this simple machine.
Inclined plane
A person makes a second-class lever in which the fulcrum is 2 feet from the resistance, while the effort is 6 feet from the fulcrum. What is the mechanical advantage of the lever?
6 divided by 2 = 3
Experiments in which neither the participants nor the people analyzing the results know who is in the control group.
Double blind experiments
Simple machine that is an inclined plane wrapped around the axle of a wheel and axle.
Screw
In inclined plane has a slope that is 7 feet long, and the height is 2 feet. What is the mechanical advantage?
7 divided by 2 = 3.5
What does soap do to the surface tension of water?
Reduces it
In this simple machine, a large circular wheel is attached to a smaller cylinder.
Wheel and Axle
A wheel has a diameter of 26 inches while its axle has a diameter of 2 inches. What is the mechanical advantage of this wheel and axle?
26 divided by 2 = 13
Data from an experiment that depends on the opinions of people.
Subjective data
Your forearm is what class of lever? Show the three parts.
Third class.
Fulcrum (elbow), effort (muscle), resistance (thing you are lifting)
A screw has a pitch of 0.04 inches. Its head has a diameter of 0.25 inches. What is the mechanical advantage of the screw if you grasp it on the head and screw it in?
Circumference = 0.785 in
0.785 divided by 0.04 = 19.6