Exam 2 Clicker Questions Study Guide
Exam 2 Clicker Questions Study Guide PHYS 211
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This 2 page Study Guide was uploaded by Molly O'Neil on Monday October 26, 2015. The Study Guide belongs to PHYS 211 at Towson University taught by Dr. Katarzyna A. Oldak in Fall 2015. Since its upload, it has received 110 views. For similar materials see General Physics I in Physics 2 at Towson University.
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Date Created: 10/26/15
Physics Exam 2 Clicker Question Force and Motion What happens when I throw a ball across the room What is pushing on it to keep it moving while it flies through the air 9 Nothing once you let the ball go only air is touching it If a force acts on an object it must be moving 9 False the object can be stationary If an object is moving there is a force acting on it 9 Face could be continuous If an object is accelerating there must be a force acting on it 9 True acceleration needs at least one force You put your book on the bus seat next to you When the bus stops suddenly the book slides forward off the seat Why 9 no net force acted on it the book was originally moving forward because it s a moving bus when the bus stopped the book stilled moved forward You kick a smooth flat stone out on a frozen pond The stone slides slows down and eventually stops You conclude that 9 a net force acted on it all along there had to be some force slowing it down the force was friction No net force is required to keep a cart moving at constant velocity What would have to be done in order to have the cart continue with constant acceleration 9 push the cart continuously in order to achieve a nonzero acceleration it is necessary to maintain the applied force What can you say about the force of gravity Fg acting on a stone and a feather 9 Fg is greater on the stone the stone has more mass and therefore more weight but the acceleration is the same for both 98 msZ When you climb up a rope the first thing you do is pull down on the rope How do you manage to go up the rope by doing that 9 the rope actually pulls you up the quotreactionquot force by the rope on you pulls you up the rope A small car collides with a large truck Which experiences the greater impact force 9 both the same according to Newton s Third Law both vehicles experience the same magnitude of force During the collision between the car and the truck which experiences the greater acceleration 9 the car acceleration is given by Fm so the car has the larger acceleration because it has the smaller mass A very large truck sits on a frozen lake Assume there is no friction between the tires and the ice A fly suddenly smashes against the front window What will happen to the truck after the collision is over 9 it moves backward at constant speed when the fly hit the truck it exerted a force on the truck for only a fraction of a second when the fly is squashed it no longer exerted a force and then the truck simply continued to move at a constant speed A force is NOT required to keep an object moving in a given direction A ball is moving upwards and rightwards towards its peak The ball experiences a force that is directed upwards and rightwards 9 FALSE If a person throws a ball with his hand then the force of the hand upon the ball is experienced by the ball for at least a little while after the ball leaves the hand 9 FALSE If an object is at rest then there are no forces acting upon the object 9 FALSE Circular Motion Bonnie sits on the outer rim of a merrygoround and Klyde sits midway between the center and the rim The merrygoround makes one complete revolution every 2 seconds Klyde s angular velocity is 9 the same as Bonnie s the angular velocity of any point on a solid object rotating about a fixed axis is the same Bonnie sits on the outer rim of a merrygoround and Klyde sits midway between the center and the rim The merrygoround makes one revolution every 2 seconds Who has the larger linear tangential velocity 9 Bonnie the linear speed will be different because they have a different radius distance from the center You swing a ball at the end of string in a vertical circle Because the ball is in circular motion there has to be a centripetal force At the top of the ball s path what is Fc equal to 9 Fc T mg 9 Fc points toward the center of the circle ie downward the weight vector points down and the tension exerted on the string also points down A skier goes over a small round hill with radius R Because she is in circular motion there has to be a centripetalforce At the top of the hill what is Fc of the skier equal to 9 A rider in a quotbarrel of fun finds herself stuck with her back to the wall Which diagram correctly shows the forces acting on her 9 A arrows up frictional force down gravity and pointing to the left normal force John is going to swing the ball in a circle If he lets it go at the redorange dot where will the ball go 9 B in a straight line tangential velocity Rotational Motion and Equilibrium You are using a wrench to loosen a rusty nut Which arrangement will be the most effective produces max torque in loosening the nut 9 B long lever arm because the forces are all the same the only distance is the lever arm length it will provide the largest torque Two forces produce the same torque Does that mean that the forces must have the same magnitude 9 No because torque is the product of force x distance two different forces that act different distances could still give the same torque Where is the center of mass of a baseball bat located 9 closer to the thick end most of the mass is at the tick end Two spheres have the same radius and equal masses One is made of solid aluminum and the other is made from a hollow shell of gold Which one has the bigger moment of inertia about an axis through its center 9 hollow gold moment of inertia depends on mass and distance from axis squared bigger for the shell because the mass is further from the center A 1kg ball is hung at the end of a rod 1m long If the system balances at a point on the rod 025 m from the end holding the mass what is the mass of the rod 9 1 kg the total torque about the pivot must be zero The center of mass of the rod is at its center because this must balance the ball the masses must be the same
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