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48 Cards in this Set
- Front
- Back
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the rate at which velocity changes over time
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acceleration
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force that is acting on an object that is not moving or changing speed
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balanced force
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the change in position of an object
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displacement
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friction that occurs when an object is moving through a fluid such as water or air
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fluid friction
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any push or pull
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force
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What is the standard unit for force?
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Newton (kilogram meter per second squared)
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force that opposes motion between two surfaces in contact
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friction
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force that opposes the movement of two surfaces that are in contact and are sliding over each other
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kinetic friction
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an object's change in position relative to a reference point
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motion
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stationary object that is observed in relation to a moving object
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reference point
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friction that occurs if a round object rolls over a flat surface
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rolling friction
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friction that occurs when objects slide past each other
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sliding friction
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the distance traveled divided by the time interval during which the motion occurred
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speed
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force that resists the initiation of sliding motion between two surfaces that are in contact and at rest
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static friction
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the speed of an object in a particular direction
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velocity
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force that is acting on an accelerating object
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unbalanced force
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measures the path taken
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distance
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substances that are applied to surfaces to reduce the friction between them
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lubricants
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What is the formula for velocity?
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velocity equals distance over time (v=d/t)
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What is the formula for acceleration?
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acceleration equals final velocity minus initial velocity all over time (a=[Vf-Vi]/t)
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What is the formula for force?
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force equals mass times acceleration (f=ma)
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anything that is thrown or shot thorugh the air
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projectile
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the only force acting on a projectile
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gravity
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What is the acceleration of gravity?
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9.8 meters per second squared
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tendency of an object at rest to remain at rest, or if moving, to continue moving
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inertia
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the motion of a body when only the force of gravity is acting on the body
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free fall
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the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
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terminal velocity
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a quantity defined as the product of the mass and velocity of an object
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momentum
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What is the standard unit for momentum?
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kilogram meter per second
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acceleration toward the center of a curved or circular path
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centripetal
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perpendicular to the Earth; increases once an object is thrown
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vertical velocity
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parallel to the Earth; remains constant once a object is thrown
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horizontal velocity
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the force of an object due to gravity
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weight
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What are Newton's Laws?
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1. Law of Inertia
2. f=ma 3. forces act in pairs |
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What is the formula for velocity in free fall?
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velocity equals gravity times time (v=gt)
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What is the formula for distance in free fall?
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distance equals one-half acceleration times time squared
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What is the formula for weight?
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weight equals mass times gravity (W=mg)
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What is the formula for momentum?
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momentum equals mass times velocity (p=mv)
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the transfer of energy to a body by the application of a force that causes the body to move in the direction of the force
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work
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What is the standard unit for work?
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Joules (Nm)
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a quantity that measures the rate at which work is done or energy is transformed
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power
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What is the standard unit for power?
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Watt (J/s)
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a quantity that measures how much a machine multiplies force or distance
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mechanical advantage
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one of the six basic types of machines, which are the basis for all other forms of machines
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simple machine
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What are the six simple machines?
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lever, pulley, wheel and axel, inclined plane, wedge, and screw (also include gear)
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What is the formula for work?
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work equals force times distance (W=Fd)
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What is the formula for power?
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power equals work over time (P=W/t)
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What is the formula for mechanical advantage?
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mechanical advantage equals resistance force over effort force or distance of the effort over distance of the resistance (MA=Fr/Fe or De/Dr)
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