Flashcards in Physics Phinal Deck (43)
What was Galileo's contribution to science
He thought how things happened. Galileo quantified
What was Kepler's contribution to science
Kepler came up with the three laws of planetary motion
What are kepler's three laws of planetary motion
One the paths of planets are… With the sun at one focus
2 imaginary line from the sun to a planet sweeps out equal areas in equal time intervals best planets move faster when they are closer to the sun and slower when they're farther away from the sun
3 (p1/p2)squared is proportional to (r1/p2) cubed
What are Newton's three laws of gravity
I. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
II. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.
III. For every action there is an equal and opposite reaction.
What is Einstein's contribution to science
The theory of gravity
What is Einstein's theory of gravity
Amass causes space to be curved and other bodies are accelerated because of the way they follow this curved space.
What is the definition of science and physics?
Science is using observation, experimentation, and generalization to uncover the regularities but which God governs His physical creation.
What is accuracy
Accuracy is how well the results of an experiment agree with the standard value
What is precision
The degree of exactness of measurement.
Inverse: reflexive to one another
Linear: straight line
What is a vector quantity
A vector quantity is an arrow on a map. They tell you not only the magnitude but direction.
What is a scalar quantity
Think of grapes on a scale. Scalar quantities tell you the magnitude of something.
What is average velocity
Average velocity is equal to the change in distance over change in time
What is the average acceleration
It is change in velocity over change in time
What is the law of universal gravitation
Newton's law of universal gravitation states that any two bodies in the universe attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
What is the gravitational field?
the region of space surrounding a body in which another body experiences a force of gravitational attraction.
What is contact force
Acts on an object by only touching it.
In physics, a contact force, is a force that acts at the point of contact between two objects, in contrast to body forces. Contact forces are described by Newton's laws of motion, as with all other forces in dynamics. Contact force is the force in which an object comes in contact with another object.
THINK OF: the escalator problems. Your apparent weight is nothing because you don't have a contact force pushing UP on you.
What is long-range force?
Long range force is exerted without contact
What is the law of inertia
Inertia is the tendency of an object to resist change.
What is an equilibrium
a state in which opposing forces or influences are balanced. (Physical balance)
What was Aristotle's contribution to science
He thought why things happen
What are common misconceptions about forces?
When the ball has been thrown the force of the hands that through it remains on it. I am a force is needed to keep an object moving. Inertia is a force. Air does not exert a force. The quantity M a is a force.
When a ball has been thrown the force of the hands that through it remains on it.
No the force the hand is a contact force them for once contact is broken the force will no longer be exerted.
A force is needed to keep an object moving
If there is no net force on the object, then the object keeps moving with unchanged velocity. If friction is a factor, then there is no net force and the object's velocity will change.
Inertia is a force.
Inertia is the tendency of an object to resist change in its velocity. Forces are exerted on objects by the environment; they are not properties of objects.
Air does not exert a force
Air exerts a huge force, but because it is balanced on all sides, it usually exerts no net force unless an object is moving. You can experience this force only if you remove the air from one side. For example, if you stick a suction cup on the wall or table you remove the air from 15. The suction cup is difficult to remove because of the large unbalanced force of the error on the other side.
The quantity ma is a force
The equals sign in F equals MA does not define m a as a force rather, the = means that experiments have shown that two sides of the equation are equal.
What is friction
The contact force that acts to oppose sliding motion between surfaces.
The contact force exerted by the surface of an object