# Shared Flashcard Set

## Details

First Test
Chapters 2-first section of 5
25
Physics
01/30/2013

Term
 Leaning Tower of Pisa Experiment
Definition
 Experiment: Dropping objects of various weights from the top of the tower. Result: Except for small effect of air resistance; objects of various weights fell at the same time and hit the ground at the same time. Conclusion: Weight does not have any effect on falling objects.
Term
 Inclined Plane Experiment 1
Definition
 Hypothesis: If there isn't any interference with a moving object, it will keep moving in a straight line forever. Experiment: If the slope is level, does the speed change? Result: Slope up, the speed decreases. Slope down, the speed increases. Conclusion: Level slop, the ball will not speed up or slow down, unless friction acted on the ball.
Term
 Inclined Plane Experiment 2
Definition
 Experiment: Rolling balls on facing inclined planes. Result: The height on the other side was about the initial height it started from. Conclusion: The less steep the slope, the further the ball will go, but it will maintain it's original height.
Term
 Inertia
Definition
 Is a property of an object to resist changes in its motion. Mass is a measure of inertia.
Term
 Isaac Newton
Definition
 Discovered three laws of motion. Discovered law of gravity. Discoveries in optics.
Term
 First Law Of Motion
Definition
 Every object in a state of motion, tends to stay in motion, unless acted upon by an outside force. An object at rest tends to stay at rest. Law of Inertia
Term
 Force is...
Definition
 1) a push 2) a pull
Term
 Examples of forces
Definition
 Weight Support force Tension Friction
Term
 Weight
Definition
 The same as the gravitational force acting on an object.
Term
 Support force
Definition
 The force that a surface exerts on an object resting on it.
Term
 Tension
Definition
 The force in a rope or a string when something hangs from the rope or string, streches it.
Term
 Friction
Definition
 The force between two surfaces that opposes motion.
Term
 Vector quantity
Definition
 Has both a magnitide (size) and direction.
Term
 Examples of vector quantities:
Definition
 Q-force, velocity and acceleration.
Term
 Units of force:
Definition
 SI system Customary
Term
 SI System:
Definition
 (N) Newton is approximately 1/4 of a pound
Term
 Customary:
Definition
 Pound
Term
 Net force
Definition
 1) Is the total force. 2) The total takes into account both magnitude and direction.
Term
 Examples of inertia
Definition
 1) Car trying to turn a corner on slippery ice. 2) Flipping a coin while on a high-speed jet moving with a constant velocity. 3) Planets' motion if the sun's gravity turned off.
Term
 If the net force is zero, an object's motion or non-motion will
Definition
 make a new path, tangent to new path.
Term
 Mechanical equilibrium
Definition
 Is an application of Newton's first law of motion.
Term
 Mechanical equilibrium occurs when...
Definition
 the net force acting on an object is zero.
Term
 Mechanical equilibrium, mathmatically stated:
Definition
 ΣF=0
Term
 Remember! With mechanical equilibrium:
Definition
 when the net force equals zero, the object's motion remains constant in both.
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