Unit 1 - About Science
Science is a _________
Body of Knowledge
This is the standard unit of length in science
Meters
The "net force" on an object is _____.
the combination of all the forces on the object
What is Newton's Second Law?
Force = Mass x Acceleration
What is Newton's 3rd Law?
To every action there is always an opposed equal reaction
A Hypothesis is different than a theory because a hypothesis is NOT
Well-Tested
"King Henry Died By Drinking..." is a method of remembering _____.
the metric prefixes
What is a force in Physics?
a push or a pull
If the force acting on a car doubles, what happens to the cart's acceleration?
It Doubles
According to Newton's Third Law of Motion, forces always occur
in pairs. For a force to occur there must be two objects interacting.
A close agreement by competent observers of observations of the same phenomena is known as a _______
Scientific Fact
What is the standard set of measurement-units used in science?
S.I. Units (International System)
After you kick a soccer ball in space, how much force is needed to keep it moving at a constant velocity?
No force is necessary to keep it moving at a constant velocity.
A girl whose weight is 200N hangs from a bar supported by two strands of rope. What is the tension in each strand?
100N
When you step off a curb, Earth pulls you downward. The reaction to this force is
You pulling Earth upward
Physics is considered the basic science because _____
The concepts and principles of Physics underlie all the other sciences.
In the "Diameter of the Moon" measurement activity, we figured out the size of the moon by _____.
creating similar triangles and using proportions
When you throw a baseball, what force propels the ball after it leaves your hand?
no force propels the ball
True or False? The acceleration of an object is inversely proportional to the net force acting on it
False. Acceleration is proportional to Net Force
Consider a high-speed bus colliding head-on with a flying bug. The force of impact splatters the unfortunate bug over the windshield. Which is greater, the force on the bug or the force on the bus?
Neither. Both are the same amount
The scientific attitude is one of inquiry, integrity, and ___________
Humility (Willingness to Admit Error)
Centuries before the birth of Christ, Aristarchus accurately measured the diameter of the Moon using:
Earth's shadow during a lunar eclipse, and some math
Galileo explored the concept of inertia by _____.
rolling a ball on slopes of various angles
A tennis ball and a solid steel ball the same size are dropped at the same time. Which ball has the greater force acting on it?
Neither. They both have the same force acting on them
If you shot Dean Magee out of a cannon, he would accelerate (as he is pushed by the sudden expansion of gasses). If you shot Mrs. Popich out of the same cannon (same net force as applied to Dean Magee) she would _____.
accelerate more than Dean Magee because she is less massive