Conceptual Physics Midterm Exam Prep Questions with Correct Answers

Conceptual Physics Midterm Exam Prep Questions with Correct Answers The newton is a unit of a. force b. mass c. inertia d. density - Answer-a. force If an object's mass is decreasing while a constant force is applied to the object, the acceleration a. remains the same. b. decreases. c. increases. - Answer-c. increases. Two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet? a. 0 b. half the sum of their original momentums c. twice the sum of their original momentums d. impossible to determine without additional information - Answer-a. 0 An object is propelled along a straight-line path by a force. If the net force were doubled, the object's acceleration would be a. half as much. b. four times as much. c. twice as much. d. the same. e. none of these - Answer-c. twice as much. A ball tossed vertically upward rises, reaches its highest point, and the falls back to its starting point. During this time the acceleration would be a. half as much. b. four times as much. c. twice as much. d. the same. e. none of these. - Answer-b. four times as much. Which has the greater mass? a. an automobile battery b. a king-size pillow c. neither - both have the same - Answer-a. automobile battery While a car travel around a circular track at a constant speed, its a. inertia is zero b. acceleration is zero. c. velocity is zero. d. none of the above. - Answer-d. none of the above. A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is a. less than 1000 N. b. more than 1000 N. c. 1000 N. d. impossible to determine. - Answer-c. 1000 N A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is a. 500 N downward. b. 500 N upward. c. 800 N downward. d. 300 N upward. e. 300 N downward. - Answer-d. 300 N upward. An object lifted 10 meters gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain is a. half as much. b. twice as much. c. more than four times as much. d. four times as much. e. the same. - Answer-b. twice as much. An object that has kinetic energy must be a. at an elevated position. b. at rest c. moving d. falling. e. none of these - Answer-c. moving A ball is tossed upward. Assuming air resistance is negligible which of the following is a true statement? a. The sum of its kinetic energy and potential energy at any point of its trajectory is always the same. b. The ball has the most kinetic energy when it is released and right before it lands., c. The ball has the most potential energy at the top of its path. d. all of these. - Answer-c. The ball has the most potential energy at the top of its path. Whenever the net force on an object is zero, its acceleration a. may be more than zero. b. may be less than zero. c. is zero. - Answer-c. is zero. A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is a. zero b. equal to its weight. c. equal to the product of its mass times its weight. d. equal to its weight divided by its mass. - Answer-a. zero. A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that a. the milk carton has no acceleration. b. the milk carton has inertia. c. gravity tends to hold the milk carton secure. d. there is an action-reaction pair of forces. e. none of these. - Answer-b. the milk carton has inertia. When an automobile is braked to a stop, its kinetic energy is transformed to a. energy of rest. b. energy of motion. c. heat. d. stopping energy. e. potential energy - Answer-c. heat. A heavy rock and a light rock of the same size are falling through th air from a tall building. The one that encounters teh greatest air resistance is the a. heavy rock. b. light rock. c. same for both - Answer-c. same for both. Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has the same a. mass. b. inertia. c. weight. d. all of the about. e. none of the above. - Answer-e. none of the above. A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on the diver is then a. 250 N. b. 410 N. c. 90 N. d. 500 N. e. none of these - Answer-d. 500 N.