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28 Cards in this Set
- Front
- Back
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A Force it?
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A force is a push or pull
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A force can cause:
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a resting object to move, or it can accelerate a moving object by changing the objects speed or direction.
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The net force is
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the overall force acting on an object after all the forces are combined
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When the forces are balanced, the net force is __.
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zero
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When an unbalanced forces acts on an objects, the _______________.
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object accelerates
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Friction is:
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A force that opposes the motion of onjects that touch as they move past each other
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Static friction is:
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the friction force that acts on objects that are not moving.
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Sliding friction is:
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the force that opposes the direction of motion of an object as it slides over a surface.
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Rolling friction is:
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the friction force that acts on rolling objects.
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Fluid friction is:
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opposes the motion of an object moving through a liquid
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fluid friction acting in the air is known as:
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air resistance
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gravity is:
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the force that acts between any two masses
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earth's gravity acts:
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downwards towward the center of the Earth
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terminal velocity is the:
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constant velocity of a falling object when the force of air resistance equals the force of gravity
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The combination of ______________________ and __________________ causes a projectile to follow a curved path.
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an initial forward velocity and the downward vertical force of gravity
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Newton explained:
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how acceleration, mass and force are related
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Newton's first law of motion says that:
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the state of motion of an object does not change as long as the net force acting on the object is zero.
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Inertia is:
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the tendancy of an object to resist a change in its motion
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Newton's second law of motion say that:
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the acceleration of an object is equal to the net force acting on it divided by the object's mass.
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Weight is:
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the force of gravity acting on an object
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Mass is:
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the measure of inertia of an object
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The Four elements found in all living organisms are:
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Oxygen, Hydrogen, Carbon, and Nitrogen
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Newton's third law says that:
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whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.
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Momentum is:
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the product of an object's mass and its velocity
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An object has a large momentum if the:
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product of its mass and velocity is large.
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conservation is:
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something that has constant value
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the law of conservation of matter says that:
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if not net force acts on a system, the the momentum of that system does not change
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In a closed system, the loss of momentum of one object equals
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the gain in momentum of the other object.
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