A
The state at which matter exists depends on the object's ___.
energy
Who developed the equation
E=mc^2 ?
Einstein
You win 500 extra points!
Yes! 500 points!
What varies with the strength of gravity?
weight
The study of liquids at rest.
hydrostatics
What are these units used for?
atm, Pa, lb/in^2
pressure
What substance is the most abundant in air?
nitrogen
The reluctance of molecules to flow because of their attraction to other like molecules and to the walls of their container.
viscosity
A device that transports air or is driven by air pressure.
pneumatic device
If the diameter of a pipe is halved, the rate of flow of the liquid inside it will ___.
increase
What is the maximum amount of relative deformation that may be permanently placed upon an object?
plasticity
The straight line distance between two points
displacement
Adhesion, cohesion, and atmospheric pressure all contribute to the (rise or fall) of water in a small tube.
rise
Displacement divided by time is ___
speed or velocity
Friction had direction ___ to motion.
opposite
Which of the four fundamental forces is the weakest?
gravitational force
Which of the four fundamental forces is the strongest?
strong force
Which of the four fundamental forces is the attraction between different masses?
gravitational force
What force is necessary to make a 25 kg object accelerate at 4.0 m/s^2 ?
F=ma
F=(25kg)(4.0 m/(s^2))
F=100. N
The point beyond which a stretched substance will not return to its original length
elastic limit
Physics is the study of what two things?
matter and energy
What are the four states of matter?
solid, liquid, gas, plasma
Of the four states of matter, which one is the most common in the universe?
plasma
The time rate of change of doing work
power
Any substance capable of flowing is a ___.
Using a fluid stream to catch up and carry another fluid
entrainment
A material that can recover its original shape after deformation displays the property of ___.
elasticity
A device that measures air pressure.
barometer
Newton's 2nd law of motion
F=ma
The number of oscillations that occur in a given time.
frequency
What is in the center of a 1st class lever?
fulcrum
What is in the center of a 2nd class lever?
load or output
What is in the center of a 3rd class lever?
effort or input
List the 6 simple machines
lever, inclined plane, screw,
wheel & axle, wedge, pulley
A vector has what two qualities?
magnitude and direction
What is Newton's 1st law of motion?
A body at rest will remain at rest and a body in motion will remain in motion unless acted upon by another force.
What is Newton's 3rd law of motion?
For every action there is an equal and opposite reaction.
A wheelbarrow is an example of what kind of lever?
2nd class lever
A fly swatter is an example of what kind of lever?
3rd class lever
Scissors are an example of what kind of lever?
1st class lever