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35 Cards in this Set
- Front
- Back
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What is a change in velocity for some time interval? Formula for it?
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acceleration, change in velocity divided by time
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What is any push or pull on an object?
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a force
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What do forces cause?
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acceleration, go slower or faster, change direction
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Force is measured in what unit?
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Newtons
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What are the two types of forces?
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Contact and field
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Which type of force is where objects collide causing acceleration?
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contact force
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Which type of force operates over an open space?
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field force
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Name the four types of field forces.
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gravity, electromagnetic, weak nuclear, strong nuclear
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What is the difference between weak and strong nuclear forces?
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Stong happens inside the nucleus and is the strongest known force. Weak happens outside the nucleus causing radioactivity.
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What is the theory attempting to prove all four field forces are the same thing?
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Grand Unification Theory
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With a field force the ________ you get the stronger the force becomes.
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closer
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What is Newton's first law of motion?
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Objects remain at constant velocity unless acted upon by an outside force.
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What is Newton's 2nd law of motion?
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Acceleration of an object is inversely proportional to an object's mass and directly proportional to the applied force.
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What is the formula used to find force or net force?
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f=(m)(a); force equals mass times acceleration
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What is Newton's 3rd law?
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For every action, there is an equal and opposite reaction.
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What is the sum of all forces acting on an object?
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the net force
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What is the pull of gravity on an object's mass?
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weight
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What is the difference between mass and weight?
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Weight is a force and vector measured in Newtons. Mass is a fundamental quantity (scalar) measured in kilograms.
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A normal force is ________ to the surface an object is resting on.
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perpendicular
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What force opposes motion?
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friction
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What are the two types of friction? What is the difference between the two?
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Static opposes the start of motion. Kinetic opposes motion in progress.
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What is the formula for the coefficient of static friction?
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ìs=Fs/Fn
(coefficient equals the force of static friction divided by the normal force) |
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What is the formula for finding the coefficient of kinetic friction?
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ìk=Fk/Fn
(The coefficient equals the force of kinetic friction divided by the normal force) |
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What are the three types of kinetic friction? Describe each briefly.
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1)sliding- surface to surface motion with no rotation
2)rolling- one or more objects are rotating 3) fluid- movement in a gas or liquid |
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Which type of kinetic friciton has the least friction?
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Fluid
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On a ramp, what force is at an angle?
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The force of gravity (weight)
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On a ramp, how does one find the angle to calculate the components of the force of gravity?
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Subtract the given angle from 90 degrees.
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Explain the relationship between mass and weight.
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They are directly related. Weight is the mass of an object times the acceleration rate of gravity.
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An object is at rest on a tabletop. If the tabletop is tilted slightly, does the normal force decrease or increase? What about the force of static friction? Explain.
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Both decrease. They are directly related.
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Why does pushing downward on a book as you push it across a table increase the force of friction between the table and the book?
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You increase the normal force which is directly related with friction.
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A sky diver falls through air. As the speed of the diver increases, what happens to his acceleration?
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Stays the same. Gravity is acting the same.
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What formula do you use when you have no acceleration?
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Äx=1/2(vi+vf)t
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What formula do you use when you have no final velocity?
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x=vit+1/2at2
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What formula do you use when you have no displacement?
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vf=vi+at
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What formula do you use when you have no time?
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vf©ü=vi©ü+2a¥Äx
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