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30 Cards in this Set
- Front
- Back
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Force
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a push or pull exerted on an object
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Net force
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the overall force on an object when all indivisual forces acting on an object are added together
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Unbalanced force
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a nonzero net-force, which changes an object's motion
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Free fall
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the motion of a falling object when the only force acting on it is gravity
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weight
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the force on an object at the surface of the planet
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Newton's first law
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An object at rest will stay at rest and an object in motion will stay in motion unless acted upon an unbalanced force
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Newton's second law
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the net force on an object is equal to the product of its acceleration and its mass
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Newton's third law
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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 of the first object
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Inertia
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the tendancy of an object to resist any change in motion
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Mass
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the amount of matter in an object
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Projectile
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an object that is thrown
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Momentum
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the product of an object's mass and velocity
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Law of universal gravitation
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the force of gravity acts between all objects in the universe
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Newton
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a unit of measure that equals the force required to accelerate one kilogram of mass at one meter per second per second
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Friction
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the force that one surface exerts on another when the two rub against each other
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Sliding friction
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friction that occurs whe none solid surface slides over another
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Air resistance
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the fluid friction experienced by objects fallin through the air
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Satellite
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any object that travels around another object in space
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Rolling friction
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friction that occurs when an object rolls over a surface
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Fluid friction
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friction that occurs as an object moves through a fluid
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Gravity
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the force that pulls objects toward each other
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Terminal velocity
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the maximum velocity an object can achieve
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Centripetal force
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a force that causes an object to move in a circle
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Law of Conservation of Momentum
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the total momentum of any group of objects remains the same unless outside forces act on the objects
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Friction acts in _______ direction of the objects movement
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opposite
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The earth is a natural
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False. satellite
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Forces can be added together when __________
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objects collide
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The greater the mass of an object the greater ________ an object has
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inertia
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What must a rocket do to lift off?
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The thrust of the rocket must overcome the force of gravity
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F=MxA,
Mo=MxA, W=MxA due to gravity |
Force kg x m/s/s or N (Newton's second law)
Momentum kg x m/s (Newton's third law) Weight kg x m/s/s or N |
