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### 46 Cards in this Set

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 An object's momentum ----- as it's mass increases. INCREASES An object starting from rest and undergoing a constant acceleration of 2 m/s will have a velocity of... What equation will be used for this problem? VELOCITY v = a t According to Newton's laws, a planet in orbit about the sun is actually ------ toward the sun. ACCELERATING When an object orbits the sun, it's always accelerating toward the sun or else it would what? FLY OFF ON A TANGENT When dealing with acceleration, a planet in orbit is actually always accelerating toward the sun. When dealing with velocity, a planet in orbit spends part of its orbit accelerating ---- the sun and then part accelerating ---- the sun. TOWARD AND FROM Newton's laws predict that a planet will move fastest when it is ---- to the sun and then sweep equal pie shaped areas about the in ---- incrememnts of time. CLOSEST, EQUAL The conservation of momentum requires that the momentum of an object only change when what. A FORCE IS ACTING UPON IT According to Newton's laws, the sun must always -----. BE ACCELERATING A 2 kg object has a velocity of 4 m/s toward the east. It has a momentum of... What equation would be used for this problem? MOMENTUM p = m v An object thrown near and parallel to the earth's surface will travel -------. IN AN ARC A baseball player throws a ball straight up in the air and catches it in the exact same point when it comes down. WITHOUT AIR RESISTANCE, the ball will have the ---- speed as when it left the player. SAME A ball played throws a ball in the air and catches it at the same spot. WITH AIR RESISTANCE, the ball will have a ------- speed as when it left the player. SLOWER An object's force is just a particular type of ----- FORCE A correct set of units for speed are ----. M/S Speed, s, of an object is a change in -----. DISTANCE The units m/s may represent... AN ACCELERATION A car traveled 300 miles in 6 hours to the east. The average speed of the car was... What would the equation used be? SPEED s = change in distance/ change in time If a zero net force is exerted on a body, then the body may be moving in a ---- ---- or it may be ------. MAY BE MOVING IN A STRAIGHT LINE OR IT MAY BE MOTIONLESS An object has a weight of 40 N on the surface of a planet with an acceleration due to gravity of m/s. The mass is... What equation is used? FORCE f = m a If body A exerts a force on body B, then body B may not --- ---- or it may change --- of motion. MAY NOT BE MOVING OR IT MAY CHANGE IT'S DIRECTION OF MOTION When the distance between the centers of two massive objects is decreased, the gravitational force between them -----. INCREASES Body A and Body B are the same distances from the earth. We know the force of the earth exerted on Body A is one half the force that it exerts on Body B. So, Body A must----- as Body B. HAVE HALF AS MUCH MASS The physial quantity most closesly identified with inertia is ---- MOMENTUM If the mass of the earth were to increase by 4, then the acceleration due to earth's gravity would ---- by a factor of 4. DECREASE When the disttance between the two centers of two massive objects is changed by a factor of 6, the gravitational force between them changes by a factor of ----- 36 A 5 kg object 3 meters above the earth has a potential energy of... What is the equation? POTENTIAL ENERGY pe = m g h g= 9.087 m/s^2 The kinetic energy of a 5 kg object with a velocity of 10 m/s is... Equation/ KINETIC ENERGY ke = 1/2mv^2 When the distance between two charged particels is decreased by a factor of 2, then the electirc force between them ---- by a factor of 4. INCREASES BY FACTOR OF 4 The ultraviolet catastrophe refers to the inability of physics to correctly predict ---- at the beginning of the 20th century. LIGHT EMITTED FROM HOT OBJECTS According to Kepler's laws, a planet in orbit about the sun moves ---- when it's closest to then sun. FASTEST According to Kepler's Laws, a planet in an orbital period about the sun of 30 years must be grater than 9 AU. What equation is used? P^2 = D^3 30^2 = 900 = D^3 9 SQUARED = 81 9 CUBED = 729 Must be higher than 9 True or false? The electromagnetic force is responsible for holding nuclei together. FALSE True or false? Aristotle believed that heavenly motion was fundamentally the same as earthly motion. FALSE True or false? The ultraviolet catastrophe can be resolved by employing relatvitiy. FALSE First law of motion states that an object continues its present straight line motion unless acted upon by a --- --- ----. NON ZERO FORCE Second law states that an acceleration, a, of an object is equal to net force. What is the equation of net force? F = M A A = F/M What are some units of acceleration? M/S^2 Mass- KG KG M/S^2 IS A NEWTON Speed, s, is a change in distance, d, that object moves in given time, t. What are some units of speed? S = D/T MILE/HOUR What is the equation for acceleration? A= V/T The thrid law states that for every action that is an ---- and ---- reaction. EQUAL AND OPPPOSITE Momentum can be thought of as a numberical measure of ----. INERTIA The gravitational force is the magnitutde of force of attraction, Fg, between two bodies with masses, m1 and m2, are seperated by distance, r.. What is g equal to? 6.6 X 10 When gravitational force is between a planet and a small obkect, the force is the ---- of the object. WEIGHT Linear momentum is a mathematical formulation of Newton's ---- ---. FIRST LAW The only time momentum can change is when it's acted upon by a -----. NON ZERO NET FORCE Angular momentum is conserved in the absence of a non-zero external force. What is the equation? L = MVR ANGULAR MOMENTUM= L MASS= M VELOCTIY= V DISTANCE= R