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The generation of a magnetic field by an electric current is
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Which describes Michael Faraday’s work with electricity and magnetism? He discovered electromagnetic induction after seeing a compass needle deflected by a flowing electric current. He discovered electromagnetism after s...
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A car’s momentum is p when it is traveling with a velocity of v. If the velocity of that car doubles, what is the new momentum of the car? one halfp p 2p 4p
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In an elastic collision, energy is conserved.
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Which equation best describes the law of conservation of momentum? pi = pf pi > pf pi < pf pi + pf = 0
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Which are examples of perfectly inelastic collisions? Check all that apply. a baseball bouncing off a bat bumper cars bumping off of each other a cue ball hitting an eight ball and stopping a plane landing on an aircraft...
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A ball has a mass of 0.25 kg and is moving to the right at 1.0 m/s. It hits a ball of mass 0.15 kg that is initially at rest. After the collision, the 0.15 kg ball moves off to the right with a velocity of 0.75 m/s. What...
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Which formulas show the relationships between momentum, mass, and velocity? Check all that apply. p = mv p = mass over volume p = volume over mass m = density over volume p = volume over density v = density over mass v =...
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Two grocery carts have the same initial total momentum. The two carts collide, and now cart B has a greater final velocity. Which best describes the final total momentum of both the carts compared to the initial total mo...
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A large blue marble of mass 3.5 g is moving to the right with a velocity of 15 cm/s. The large marble hits a small red marble of mass 1.2 g that is moving to the right with a velocity of 3.5 cm/s. After the collision, th...
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Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. When the carts collide, they hook together. Assume that positive momentum is to the right. A diagram of two rolling carts on a flat...
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A box is being pulled to the right. The free body diagram is shown. A free body diagram with 4 forces. The first pointing north labeled 438 N, the second pointing northeast labeled 125 N, the third pointing south labeled...
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Which best describes the forces identified by Newton’s third law of motion? equal and acting on different objects equal and acting on the same object unequal and acting on different objects unequal and acting on the same...
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Tracy stands on a skateboard and tosses her backpack to her friend who is standing in front of her. Which best describes the acceleration Tracy experiences? It is less than the acceleration of the backpack because she ha...
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A ball is dropped from the top of a building. It initially moves at 4.0 m/s. After 0.5 seconds, it moves at 3.8 m/s. What force is responsible for the slowing of the ball? air resistance gravity normal tension
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A book is sitting on a desk. What best describes the normal force acting on the book? the upward force the desk pushes on the book the upward force the book pulls on the Earth the downward force the book pushes on the de...
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A sled that has a mass of 8 kg is pulled at a 50 degree angle with a force of 20 N. The force of friction acting on the sled is 2.4 N. The free-body diagram shows the forces acting on the sled. A free body diagram with 4...
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The gravitational force between two objects is 2000 N. The mass of each object is reduced to one-third of its original mass. How must the distance between the objects change to keep the gravitational force between them 2...
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Which is an action/reaction force pair? Check all that apply. Earth pulls on a book, and the book pushes against a shelf. A hockey stick hits a puck, and the puck pushes against the stick. A pencil pushes against a piece...
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Which changes would result in a decrease in the gravitational force between two objects? Check all that apply. increasing the distance between the objects decreasing the distance between the objects increasing the mass o...
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A box is sitting on the floor. The box was then pulled with a force, Ft. The box did not move. The free-body diagram of the box is shown. A free body diagram with 4 force vectors. The first vector is pointing downward, l...
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Which statements describe an object in motion that has no external force acting on it? Check all that apply. It accelerates and speeds up. It moves at a constant speed. It decelerates and slows down. It changes direction...
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Newton’s second law of motion states that the acceleration of an object is proportional to the net force acting on it.
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A ball is dropped from rest from the top of a building. What force is responsible for the downward motion of the ball? the force of gravity the force of tension the normal force the pushing force
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Chang sees the following formula on a website about Newton’s second law. a = Sigma F over m. What does the symbol F in the formula indicate that Chang needs to do? He needs to find the net force acting on the object in a...
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