Conceptual physics Exam Questions with Complete Solutions

Conceptual physics Exam Questions with Complete Solutions The two measurements necessary for calculating average speed are A) acceleration and time B) velocity and time C) distance and time D) distance and acceleration E) velocity and distance - Answer-Answer: C - distance/time A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is A) zero B) 10km/hr C) 110km/hr D) 1000km/hr - Answer-Answer: A - zero While an object near the Earth's surface is in free fall, its A) velocity increases B) acceleration increases C) mass increases D) mass decreases - Answer-Answer: A - velocity increases 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 its weight divided by its mass D) equal to the product of its mass times its weight - Answer-Answer: A - zero An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the earth, its speed one second later would be A) 10m/s B) 20m/s C) 30m/s D) 40m/s - Answer-Answer: B - 20m/s If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be A) constant B) less and less each second C) greater than the second before D) doubled - Answer-Answer: C - greater than the second before If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about A) 5m/s B) 10m/s C) 15m/s D) a variable amount E) depends on its initial speed - Answer-Answer: B - 10m/s If a freely falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20m/s/s, then its speed reading would increase each second by A) 10m/s B) 20m/s C) 30m/s D) 40m/s E) depends on its initial speed - Answer-Answer: B - 20m/s Twelve seconds after starting from rest, an object falling freely will have a speed of A) 10m/s B) 50m/s C) 100m/s D) more than 100m/s - Answer-Answer: D - more than 100m/s If an object moves with constant acceleration, its velocity must A) be constant also B) change by the same amount each second C) change by varying amounts depending on its speed D) always decrease - Answer-Answer: B - change by the same amount each second If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is A) 3km/h/s B) 6km/h/s C) 10km/h/s D) 60km/h/s E) 600km/h/s - Answer-Answer: B - 6km/h/s If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be A) 50m/s B) 500m/s C) 3000m/s D) 3600m/s - Answer-Answer: C - 3600m/s