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### 28 Cards in this Set

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