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Chapter 10 Vocab Review 8th Grade
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A push or pull- described by strength and direction in which it acts
force
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The SI unit used to measure the strength of a force
1Kg * m/s2 Newton (N)
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The combination of all forces acting on an object.
Net force
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Result in a net force and cause a change in the object’s motion.
Unbalanced forces
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Equal forces acting on one object in opposite directs
Balanced forces
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The force that two surfaces exert on each other when they rub against each other.
Friction
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The friction that acts on objects that are not moving
Static friction
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Occurs when two solid surfaces slide over each other.
Sliding friction
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When an object rolls across a surface.
Rolling friction
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Occurs when a solid object moves through a fluid.
Fluid Friction
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A force that pulls objects toward each other.
Gravity
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The force of gravity on a person or object at the surface of a planet.
weight
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Happens when the only force acing on a falling object is gravity.
Free fall
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An upward force exerted on falling objects.
Air resistance
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The greatest velocity a falling object reaches
Terminal velocity
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An object that is thrown
Ex. Throwing the football in class Projectile
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An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force. Newton’s First Law of Motion
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The tendency of an object to resist a change in motion.
Ex. When you are running it is hard to stop quickly because your body has inertia and resists a change in motion. Inertia
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Acceleration depends on the object’s mass and on the net force acting on the object.
Newton’s Second Law of Motion
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If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object. Newton’s Third Law of Motion
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A characteristic of a moving object that is related to the mass and the velocity of the object.
Momentum
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In the absence of outside forces, the total momentum of objects that interact does not change.
Law of conservation of momentum
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Any force that causes an object to move in a circular path.
Ex. Swinging a bucket of water around your head. Centripetal force
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