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### 30 Cards in this Set

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 If a question gives initial and final velocities, and time, what formula would be used to find displacement? d = 1/2 (vo + v)t If initial velocity, acceleration, and time are given, what formula would be used to find final velocity? v = vo + at If initial velocity, time, and acceleration are given, what formula would be used to find displacement? d = v(initial)t +/- a(t^2) What formula would be used to find final velocity independent of time? v(final)^2 = v(initial)^2 + 2ad What is the formula for average velocity? v(avg) = (change in d)/(change in t) What is the difference between averge speed and average velocity? Average speed is the total distance traveled per time. Average velocity is the total displacement traveled per time. What is happenening to an object's speed if its acceleration is in the same direction as its velocity? Its speed is increasing. If an object's acceleration is perpendicular to its velocity, what is happening? Its speed is constant, but the direction of the velocity is changing. If an object's acceleration is opposite its velocity, what is happening? The object's speed is decreasing. If acceleration is occuring at an angle between 0 and 90 degrees, what is happening? The object's speed is increasing and its direction is changing. If acceleration is occuring at an angle between 90 and 180 degrees, what is happening? The object's speed is decreasing and its direction is changing. State Newton's first law. An object will resist changes in its velocity. State Newton's second law. The sum of the forces acting on an object are the product of its mass and the sum of all acceleration vectors. F = ma State Newton's third law. F(2 on 1) = -F(1 on 2) What is force? Force is a push or pull exerted by one object on another. What is the relationship between a force and its acceleration? Because mass is a positive quantity, the force an object feels always occurs in the direction of its acceleration. If an object has a net force of 0, will the object move? If the object is already in motion, yes. Describe Newton's Law of Gravitation (and formula) Every object in the universe exerts a gravitational pull on every other object in the universe. F(grav) = (GMm)/r^2 Describe the relationship between an object's weight and Newton's Law of gravitation. F(grav) = mg, so: mg = (GMm)/r^2 g = GM/r^2 What is an object's normal force? Normal force is the force a surface exerts on objects resting upon it. If an object is resting on a flat, horizontal surface, its Fnet = 0. The object's gravitational force = -mg. The object's normal force = mg. What is kinetic friction? Friction that occurs when there is relative motion between two surfaces. F(f, max) = u(s)Fnormal What is static friction? The maximum force of static friction is the amount of force required to initiate motion in a resting object. F(f) = u(k)Fnormal What is the force due to gravitiy acting parallel to an ojbect on an inclined plane? mg sin theta What is the normal force exerted by the inclined plane on an object? mg cos theta Describe an object's center of mass. The point at which all mass of an object is concentrated. Describe an object's center of gravity. The point at which the total gravitational force on a system can be considered to act. Define uniform circular motion. An object moving in a circular path with constant speed. What is the formula for centripetal acceleration? a(c) = v^2/r What is the formula for centripetal force? F(c) = ma(c) What is centripetal force? The force required to keep an object moving along a circular path.