Conceptual Physics Ch 4 Test Questions with Answers

Conceptual Physics Ch 4 Test Questions with Answers The force of friction can occur A) with sliding objects. B) in water. C) in air. D) all of the above. - Answer-D) all of the above. When Sanjay pushes a refrigerator across a kitchen floor at a constant speed, the force of friction between the refrigerator and the floor is A) less than Sanjay's push. B) equal to Sanjay's push. C) equal and opposite to Sanjay's push. D) more than Sanjay's push. - Answer-C) equal and opposite to Sanjay's push. When Sanjay pushes a refrigerator across a kitchen floor at an increasing speed, the amount of friction between the refrigerator and the floor is A) less than Sanjay's push. B) equal to Sanjay's push. C) equal and opposite to Sanjay's push. D) more than Sanjay's push. - Answer-A) less than Sanjay's push. Mass - Answer-The quantity of matter in an object. It is also the measure of the inertia or sluggishness that an object exhibits in response to any effort made to start it, stop it, or change its state of motion in any way. Weight - Answer-The force upon an object due to gravity. If the mass of an object is halved, the weight of the object is A) halved. B) twice. C) depends on location. D) none of the above. - Answer-A) halved. When the string is pulled down slowly, the top string breaks, which best illustrates the A) weight of the ball. B) mass of the ball. C) volume of the ball. D) density of the ball - Answer-A) weight of the ball. When the string is pulled down quickly, the bottom string breaks, which best illustrates the A) weight of the ball. B) mass of the ball. C) volume of the ball. D) density of the ball. - Answer-B) mass of the ball. Newton's Second Law of Motion - the law of acceleration - Answer-The acceleration produced by a net force on an object is directly proportional to the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object. Law of Acceleration equation - Answer-acceleration = net force / mass Consider a cart pushed along a track with a certain force. If the force remains the same while the mass of the cart decreases to half, the acceleration of the cart A) remains relatively the same. B) halves. C) doubles. D) changes unpredictably. - Answer-C) doubles. Push a cart along a track so twice as much net force acts on it. If the acceleration remains the same, what is a reasonable explanation? A) The mass of the cart doubled when the force doubled. B) The cart experiences a force that it didn't before. C) The track is not level. D) Friction reversed direction. - Answer-A) The mass of the cart doubled when the force doubled. At one instant, an object in free fall has a speed of 40 m/s. Its speed 1 second later is A) also 40 m/s. B) 45 m/s. C) 50 m/s. D) none of the above. - Answer-C) 50 m/s. A 5-kg iron ball and a 10-kg iron ball are dropped from rest. For negligible air resistance, the acceleration of the heavier ball will be A) less. B) the same. C) more. D) undetermined. - Answer-B) the same. A 5-kg iron ball and a 10-kg iron ball are dropped from rest. When the free-falling 5-kg ball reaches a speed of 10 m/s, the speed of the free-falling 10-kg ball is A) less than 10 m/s. B) 10 m/s. C) more than 10 m/s. D) undetermined. - Answer-B) 10 m/s