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### 28 Cards in this Set

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 force force a push or a pull net force net force the overall force on an object after all the forces are added together. unbalanced forces unbalanced forces a nonzero net force that changes an object's motion. (can cause an object to start moving, stop moving, or change direction) balanced forces balanced forces equal forces acting on one object in opposite directions inertia inertia the tendency of an object to resist change in its motion. mass mass the amount of matter in an object. newton ( N ) newton ( N ) a unit of measure that equals the force required to accelerate one kilogram of mass at a rate of one meter per second per second. friction friction the force that one surface exerts on another when the two rub against each other sliding friction sliding friction the kind of friction that occurs when solid surfaces slide over each other rolling friction rolling friction the kind of friction that occurs when an object rolls over a surface fluid friction fluid friction the kind of friction that occurs when an object moves through a fluid free fall free fall When the only force acting on a falling object is gravity (the object accelerates as it falls) projectile projectile an object that is thrown air resistance air resistance the fluid friction experienced by objects falling through air terminal velocity terminal velocity the maximum or greatest velocity a falling object achieves momentum momentum the product of its mass and its velocity (it is in the same direction as its velocity) law of conservation of momentum law of conservation of momentum the rule that the total momentum of objects in an interaction does not change satellite satellite any object that travels around another object in space centripetal force centripetal force any force that causes an object to move in a circle (first word means "center-seeking" What is the difference between "balanced" and "unbalanced" forces? Balanced forces acting on an object will NOT change the object's motion. Unbalanced forces acting on an object WILL change the object's motion. What is Newton's First Law of motion? This law states that an object at rest will remain at rest and an object that is moving at constant velocity will continue moving at constant velocity unless acted upon by an unbalanced force. The net force on an object is equal to the product of its acceleration and its mass. How can the equation be written to show the relationship among the quantities force, mass and acceleration? (2 ways) Force = Mass x Acceleration Acceleration = Force divided by mass The strength of the force of friction depends on what two factors? the types of surfaces involved how hard the surfaces push together What is weight? the force of gravity on a person or object at the surface of a planet. What is the law of universal gravitation? The law of universal gravitation states that the force of gravity acts between all objects in the universe. Any two objects in the universe, without exception, attract each other. What is Newton's third law of motion? It states that 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. To find weight how can one rewrite Newton's second law of motion? Force = Mass x Acceleration Weight = Mass x Acceleration due to gravity What is the formula for finding the momentum of an object? Momentum = Mass x Velocity