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Chapter Ten
Question | Answer |
---|---|
force | is a push or pull |
newton | SI unit for the magnitude or strength |
net force | The combination or cumulative effect, of all the forces acting on an object to determine whether an object moves and also in which direction it moves |
unbalanced forces | will cause the velocity of an object to change...speed up, slow down, or change direction |
balanced forces | Equal forces acting on one object in opposite direction |
friction | is a force that two surfaces exert on each other they rub against each other |
static friction | friction that acts on objects that are not moving |
sliding friction | occurs when two solid surfaces slide over each other |
rolling friction | when an object rolls across a surface |
fluid friction | occurs when a solid object moves through a fluid |
gravity | is a force that pulls objects toward each other |
mass | The measure of the amount of matter in an object |
weight | the gravitational force exerted on a person or object at the surface of a planet Weight = Mass x Acceleration due to gravity |
free fall | when the only force acting on an object is gravity |
air resistance | a type of fluid friction acts on objects falling through air. |
projectile | an object that is thrown |
compression | is an elastic force that squeezes or pushes matter together |
tension | an elastic force that stretches or pulls matter |
inertia | is the tendency of an object to resist a change in motion |
momentum | quantity is a characteristic of moving object that depends on both the mass and velocity of the object |
law of conservation of momentum | states in the absence of outside forces, the total momentum of objects that interact does not change, or is conserved, unless outside forces act on the objects. The amount of momentum is the same before and after they interact. |