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70 Cards in this Set
- Front
- Back
What is the SI unit for length |
meter |
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What is the SI unit for mass |
kilogram (kg) |
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What is the SI unit for time |
second (s) |
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What is the SI unit for speed |
m/s |
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What is the SI unit for density |
kg/m^3 |
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What is the SI unit for work |
kg*m^2/s^2 |
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What is the symbol p mean |
pico |
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What does the symbol n mean |
nano |
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What is the multiple for pico |
10^-12 |
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What is the multiple for nano |
10^-9 |
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What is the multiple of micro |
10^-6 |
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What is the multiple of milli |
10^-3 |
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What is the multiple of centi (c) |
10^-2 |
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What is the multiple of kilo (K) |
10^3 |
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What is the multiple of mega (M) |
10^6 |
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What is the multiple of giga (G) |
10^9 |
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What does the OAT use as the graviational acceleration? |
10 m/s^2 |
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What is inertia |
Natural resistene to change in their state of motion |
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What are forces like in the first law of Newton's Law? |
There are no net force on an object (There can be forces on object but just cancel each other out) |
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What is mass? |
Quantitative measure of its inertia (mass measures how much matter is contained in an object) |
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What is mass measured in |
Kilograms (kg) |
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An object with a mass of 100 kg has 100 times more _____ than an object wiht a mass of 1 kg |
inertia |
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What does Newton's second law state? |
Net forces (total force) acting on an object of mass (m) then the resulting acceleration of the object (a) satisfies this simple equation F = (m)(a) |
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Is force and acceleration in the same or opposite directions |
Same direction Because m is a positive number An objet will acceleration in a direction of the net force it feels |
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Does F = 0 mean that the object has a velocity of 0 |
No, if F = 0 it means that acceleration is zero which means that the object's velocity does not change but that does not necessarily mean that it is not moving, just means it is not accelerating |
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What odes action-reaction pair mean |
Forces two object act on each other are equal but opposite |
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For Newton's third law if the forces are the same does that mean that the effects on both objects are the same? |
No, the effects (or resulting acceleration) are not the same if the masses of the objects are different |
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According to Newton's third law, every force is "accompanied by" an equal but opposite force. If this is true, shouldn't these forces cancel out to zero? How can we ever accelrate an object? |
The answer does not involve the masses of the objects; Newton's third law says nothing about the mass F net is the sum of all the forces acting on an object, not by an object |
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What is weight |
The gravitational force exerted on it by the earth (or by whatever planet it happens to be on or near) |
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Is mass or weight an intrinsic property of an object? |
Mass |
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Does weight change with location? |
Yes |
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Does mass change with location? |
No |
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What is the equation for weight (w) |
w = m (g) |
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What is the equation for Newton's Law of Gravitation? |
The magnitude of this gravitational force is proportional to the product of the objects' masses and inversely proportional to the square of the distance between them. G = constant of proportionality (Newton's universal gravitational constant) |
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What type of law is Newton's Law of Graviation? |
inverse-square law |
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What does an inverse-square law mean? |
The magnitude of the gravitational force is inversely proportional to the square distance between the centers of the objects |
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What happens to the gravitational force between two objects if the distance between them is doubled |
Since the gravitational force obeys an inverse-square law, if r increases by a factor of 2 then gravitational force will decrease by a factor of 4 |
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What happens to the gravitational force between two objects if the distance betwene them is cut in half |
Gravitational force will increase by a factor of 4 |
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What causes friction? |
When two materials are in contact, electrical attraction between the atoms of one surface with those of the other |
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What happens with friction in a rough surface |
If surfaces aren't perfeclty smooth, the roughness will increase the force required to slide the objects against each other |
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What are the two big categories of friction? |
Static friction Kinetic (sliding) friction |
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What type of force cancels out the gravitational force |
Normal force
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What types of forces are acting on an object lying on a flat surface?
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Gravitational force Normal force Both magnitudes are the same |
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Do the normal force and gravitational force of an object sitting still on a table form an action-reaction pair? |
No While these forces are equal but opposite, they are only acting on ONE object. An action-reaction pair always acts on different objects |
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What is the normal force
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Perpendicular componenet of the contact force exerted by a surface on an object |
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What is the equation for force of kinetic friction
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Force of kinetic friction = (coefficient of kinetic friction)(normal force) coefficient of kinetic friction = greek symbol mu with subscript k |
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What is the direction of the force of kinetic friction |
Parallel to surface
Opposite direction of object's velocity |
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Which is greater the maximum coefficient of static friction or the coefficient of kinetic friction? |
Maximum coefficient of static friction |
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What is the maximum force of static friction equation? |
F f, max = (maximum coefficient of static friction ) ( normal force) Maximum coefficient of static friction = greek letter mu subsript s |
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What is the direction of the force of static friction? |
Parallel to surface Opposite direction to object's intended velocity |
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What does a pulley do? |
Changes the direction of the tension that pulls on the object that the string is attached to Decrease the force necessary to lift an object |
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What does a pulley cause in terms of tension |
Causes a constant tension to exist through the entire string, which can lead to multiple tension forces pulling on an object |
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What is center of mass |
It is the point that behaves as if the object was a single particle It i also the point at which we could consider all the mass of the object to be concnetrated |
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What is the equation for finding the center of mass for point masses? |
x cm = (x1m1 + x2m2+ x3m3+....)/(m1 + m2+m3) |
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What is center of gravity |
Point at which the ottal gravitational force on the system can be considered to act |
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What is the equation for finding the center of gravity |
X CG = (w1x1 + w2x2 + w3x3 +....) / (w1 + w2 + w3) |
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Are center of gravity and center of mass equal? |
Yes |
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An object moving in a circular path is said to execute uniform circular motion if its _____ is constant |
Speed (But vector is still changing) |
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Is the acceleration of an object undergoing uniform circular motion affecting the speed of the object? |
No, the acceleration is only changing the direction of the velocity in order to keep the object moving in a circle |
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The acceleration of an object undergoing circular motion always points where
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Toward the center of the circle
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Centripital means what |
Seeking the center Describe the accelration of an object undergoing uniformal circular motion |
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How do we find centripetal acceleration? |
ac = (v^2)/r |
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If an object is accelerating what must if always be feeling |
A force |
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What is the force on an object during uniform circular motion called |
Centripetal force |
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What is the equation for centripetal force |
F c = ma(c) = (mv^2)/r |
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If an object undergoing uniform circular motion is being acted upon by a constant force toward the center, why doens't the object fall into the center? |
Actually it is falling toward the center, but because of its speed, the object reamins in a circular orbit around the center. |
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What is torque? |
A measure of a force's effectiveness at making an object spin or rotate |
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What is the equation for torque |
t = r F sin(delta) |
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What is the unit of torque |
N*m |
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x |
x |