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27 Cards in this Set
- Front
- Back
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What kind of quality is velocity?
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A vector quality
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What does velocity describe?
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How fast an object is being displaced. (change in displacement over time)
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If a body stays at the same speed, but changes direction, does its velocity change?
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Yes, b/c velocity is a vector.
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What is the formula for velocity?
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V=displacement/time
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What kind of quality is speed?
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A scalar
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What is acceleration?
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A vector describing the rate of change of velocity
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What is the formula for acceleration?
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(Final velocity - Initial velocity) / Time
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If a body stays at the same speed, but changes direction, does its accelleration change?
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Yes, because it's velocity changes.
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What is the formula for average velocity?
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V= [Initial Velocity + (Initial Velocity + Acceleration x Time)]/2
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What is the formula for displacement, at a given starting velocity and accelleration?
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D = Initial Velocity x Time + 1/2 Acceleration x (Time Squared)
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What is the acceleration due to gravity on earth?
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9.8 m/s
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Why do falling objects reach a terminal velocity?
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Air resistance increases with speed.
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In free fall in a vacuum, how far does an object fall at a given time T?
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H=1/2 (9.8 m/s) x Time Squared
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What kind of quality is mass
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Scalar
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What is mass
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The amount of matter.
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How are mass and inertia related
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Mass is a quantitative measure of intertia
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What is inertia?
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Intertia is the property of matter that resists change in state of motion, direction or speed.
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What is Newton's First Law
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Objects in motion stay in (rectilinear) motion; objects at rest stay at rest, as long as the *net sum* of forces acting on an object is zero
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What determines an object's inertia?
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its mass
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What is newton's second law?
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F=MA
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What is the direction of the net force acting on a body?
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The same as the accelleration of that body
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What is 1 Newton
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1 Kg x m / seconds squared. It is the force necessary to impart to a mass of 1 kg an acceleration of 1 m/sec/sec
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What is weight?
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Weight is the gravitational force acting on a body d/t the mass of the earth.
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What is the formula for weight?
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w=mass x gravitational pull ( = 9.8 m/s/s)
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What is Newton's third law of motion?
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When one body exerts a force on another body, the second exerts an equal and opposite force in the opposite direction of the first
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If there is always an equal and opposite reaction, how can anything move (i.e. work be done?)
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Because the forces act on different objects (e.g. w/ different masses, ergo creating different accelerations)
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What is angular momentum?
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The tendency of a spinning object to continue spinning. As with inertia, it is preserved.
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