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Motion and Design template



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QuestionsAnswers
accelerationrate of increase of speed or velocity (example: accelerator pedal on a car)
air resistance (drag)force of air pushing against the motion of an object
balanced forcean object remains in place, no movement occurs
controlpart of an experiment that does not change, serves as the standard to compare other observations
directionthe way the force is applied determines the way an object moves
energyability to do work
energy (kinetic)energy of motion (moving ball going down a ramp)
energy (potential)stored energy (ball positioned at the top of the ramp)
fair testchanging only one variable and keeping the other conditions the same
forceany push or pull on an object
frictionforce that resists motion between two touching surfaces, slows things down and can also produce heat, acts in the opposite direction of force
gravity (gravitational force)force that brings object toward earth
inertiathe tendency of an object to resist a change in motion or keep doing what it is doing
masshow much matter an object contains
momentumforce or speed of movement; mass in motion, example: a moving train has much more than a moving soccer ball
motionan object changing position over time; change in position measured by distance and time
Newton's 1st law of motionan object tends to stay at rest and an object tends to stay in motion with the same speed and direction unless acted on by unbalanced force
Newton's 2nd law of motionacceleration is always in the direction of the unbalanced force
Newton's 3rd law of motionexplains why forces act in pairs; for every action, there is an equal and opposite reaction
propellertwo or more twisted blades that rotate around a central point or shaft
resistanceforce pushing against the motion of an object
speed (rate)distance divided by time (example: 25 mph)
unbalanced forcemotion occurs, the movement goes in the direction of the greater force (example: winning of a tug-of-war game)
variablesomething in an experiment that can be changed
velocityspeed with direction (example: 45 mph NW)
weightforce of gravity pulling down on an object
workmoving an object over a distance
physical change"can affect the size, shape or color of a substance but does not affect its composition. The substances may be changed to another phase (i.e. gas, liquid, solid) or separated or combined." (ex: ice cube melting)
chemical change"the substances are altered chemically and display different physical and chemical properties after the change. When a chemical change occurs new substance(s) are formed... A chemical change is irreversible." (ex: digesting food)
simple machinea simple device for altering the magnitude or direction of a force. The six basic types are the lever, wheel and axle, pulley, screw, wedge,and inclined plane



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