Conceptual Physics Practice Exam Questions with Correct Answers

Conceptual Physics Practice Exam Questions with Correct Answers (t/f) If a hockey puck slides at a constant speed on a perfectly frictionless surface, it is demonstrating Newton's 1st Law - Answer-True (t/f) If you are holding an apple at rest in your palm, the apple's weight and the normal force supporting the apple form an action-reaction pair - Answer-False (t/f) An object in equilibrium must be at rest - Answer-False (t/f) For an object suspended by two separate ropes that is in equilibrium, the resultant of the two tensions must always be equal and opposite to the weight vector - AnswerTrue (t/f) A vector depends on both the size of the quantity and its direction - Answer-True (t/f) Acceleration is inversely proportional to the net force acting on an object - AnswerFalse (t/f) When 20 N object is lowered by a rope at a constant speed, the tension in the rope in less than 20 N - Answer-False (t/f) Air resistance depends on two factors: size and speed - Answer-True (t/f) The amount of matter in an object is called the weight - Answer-False (t/f) The combination of all the forces acting on an objec is called the normal force - Answer-False (t/f) If an object has a negative acceleration, it must be slowing down - Answer-False (t/f) The SI (metric system) unit for measuring weight is Newton - Answer-True (t/f) Inertia is the resistance any object has to change in its state of motion - AnswerTrue (t/f) If a car traveling 100 km/h strikes a bug and crushes it, the force of impact is greater on the bug than on the car - Answer-False If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is - Answer-6 km/h/s It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft - Answer-about 180 m A car accelerates at 2 m/s^2. Assuming the car starts from rest, how far will it travel in 10 s - Answer-100 m if a projectile is fired straight up at a speed of 20 m/s, the total time ti return to its starting position is about - Answer-4 seconds A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 20 seconds - Answer-about 50 m/s A rock weighs 30 N on earth. a second rock weighs 30 N on the moon. which of the two rocks has a greater mass? - Answer-the one on the moon a stone is thrown upward at 15 m/s. After 2 seconds, its velocity will be - Answer-still +15 m/s When the stone reaches the top of its path, its velocity will be - Answer--10 m/s^2 A 100 kg skydiver has reached terminal velocity of -150 m/s. The net force acting on him is - Answer-0 N what will the magnitude and direction of air resistance be once the above skydiver opens his chute and reaches a new terminal speed of 5 m/s downward - Answer-+1000 N as a ball rolls horizontally with constant speed, its displacement form its starting point - Answer-increases when you look at a cars speedometer, you see the cars - Answer-instantaneous speed a ball is thrown straight up with a speed of 70 m/s. what is its speed closest to 3 seconds later - Answer-40 m/s Ah object is in free fall (no air resistance) because of earths gravity. each second it falls - Answer-larger distance than the previous second the person who thought motion occurred through the natural attraction of objects according to their elemental composition was - Answer-aristotle a light woman and a heavy man jump from an airplane at the same time and open their parachutes at the same time. who will get to termial velocity first - Answer-light woman an object in dynamic equillibrium is an obect - Answer-moving with constant velocity and has no acceleration when you stand at rest on a pair of bathroom scale, the readings on the scales will always - Answer-add up to equal your weight