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vocab
Question | Answer |
---|---|
Referance point | a point at which other points refer to |
motion | an object's change in position relative to the referance point |
speed | the distance traveled by an object divided by the time it took the travel that distance. |
velocity | the speed of an object in a particular direction |
acceleration | the rate at which velocity changes over time |
centripal acceleration | acceleration that occurs in a circular motion |
force | a push or pull |
Newton | the SI unit for force |
net force | the combination of all of the forces acting on an object |
balanced force | when the net force on an object is 0 N |
unbalanced force | when the net force on an object in not 0 N |
friction | a force that opposes motion between two surfaces that are in contact |
kinetic energy | friction between moving surfaces |
static friction | when a force is applied to an object does not cause the object to move |
lubricants | substances that are applied to surfaces to reduce the friction between the surfaces |
gravity | a force of attraction between objects that is due to their masses. |
weight | a measure of the gravitational force on an object |
mass | the amount of matter in an object... DOESNT CHANGE |
terminal velocity | 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 |
air resistance | the force that opposes the motion of objects through air |
free fall | the motion of a body when only the force of gravity is acting on the body |
projectile motion | the curved path an objects follows when it is thrown near the center of the earth |
inertia | the tendancy of all objects to resist any change in motion |
momentum | how easy or hard it is to stop |
work | when a force causes an object to move in the direction of the force |
power | the rate at which work is done or energy is transformed |
machine | a device that makes work easier by changing the size or direction of a force |
work input | the work you do on a machine |
work output | the work done by the machine |
input force | the force i apply |
output force | the force the machine applies |
mechanical advantage | the number of times the machine multiplies force |
mechanical efficiency | a comparison of a machine's work output with the work input |
ideal machine | a machine that is 100% efficient |
energy | the ability to do work |
potential energy | the energy an object has because of it position |
mechanical energy | total energy of motion and position of an object |
friction | a forces that opposes motion between two surfaces that are touching |