Integrated Physical Sciences - WGU C165 (Q & A) Which of the following derived units do NOT measure speed? m/s cm/day mm/min2 km/hr For which case is there a net force acting on the object? A hockey puck sliding across
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Integrated Physical Sciences - WGU C165 (Q & A) Which of the following derived units do NOT measure speed? m/s cm/day mm/min2 km/hr For which case is there a net force acting on the object? A hockey puck sliding across the ice at a constant speed in a straight line An apple that has fallen to the ground A rocket accelerating upward at a rate of 5 m/s2 A 300 pound weight being held motionless over the head of a weightlifter Which of the following force statements is FALSE? A force can cause a change in motion. A force is a push or a pull. Acceleration is caused by a force. A force is not needed to cause acceleration. A car's engine provides a force of 200 N forward, while a force of 150 N from air resistance acts to oppose the car's motion. What is the net force and its direction on the car? 350 N, forward 50 N, forward 350 N, backward 50 N, backward Two tug boats attach their lines to a separate barges with the same masses in a shipping channel. If one tugboat pulls Barge A towards the west while the other tugboat pulls Barge B in the same direction applying twice as much force, which barge will accelerate more? Barge B Barge A Neither, they will accelerate at the same rate. Neither will accelerate. Which of the following statements regarding inertia is FALSE? It is more difficult to cause objects with more inertia to change velocity. Objects with more inertia are easier to accelerate. Objects with less mass have less inertia. Inertia is the tendency of an object to keep its same motion. Inertia depends on an object's -Select- weight mass acceleration Which of the following scenarios involves an action-reaction force pair? A kangaroo pushes off the ground, and the ground pushes the kangaroo forward. A rifle pushes a bullet forward, and the bullet is slowed down by air resistance. A ball is hit by a bat, and the force of gravity pulls the ball downward. Two ice skaters (John and Elisa) push off from each other. As John pushes Elisa forward, his muscles push him backward causing him to slide across the ice. Identify which of the following is NOT an action-reaction force pair. Action - The Earth pulls a falling rock downward toward it. Reaction - The rock pulls the Earth upward toward it. Action - A bird flapping its wings pushes air downward. Reaction - The air pushes up on the bird's wings. Action - A rocket taking off blasts exhaust gases against the ground. Reaction - The ground pushes the rocket upward. Action - A rifle firing pushes the bullet forward. Reaction - The bullet pushes backward on the rifle. If the acceleration of an empty truck is 1.5 m/s2, what will happen to its acceleration if it is fully loaded and its total mass doubles? The acceleration will double. The acceleration will not change. The acceleration will be half as much. The acceleration will be zero. A force of friction is not likely to exist between two objects if __________. they are leaning against each other they are sliding across each other one is standing on top of the other they are not touching A force of friction does not exist if two objects are not touching. Why do you need to give a file cabinet a stronger push to get it to start moving along the floor than to keep it moving? to overcome its mass to overcome the force of kinetic friction to overcome the force of static friction The force of static friction acts to prevent the file cabinet from starting to move. You can start a fire by rubbing a flint rock with high-carbon steel. The force that lets you do this is called the __________. force of static friction force of kinetic friction gravitational force This is the force of kinetic friction because the rock and steel are moving with respect to each other. What factors affect the force of friction between two solid objects? Select all that apply. the surface areas of the objects the speed of the objects how hard the surfaces press on each other the types of surfaces involved Both the types of surfaces involved and how hard they press on each other affect the force of friction between two solid objects. Marie pushes a box across the floor. What causes the box to move? Marie's force the force of friction mass The car is stuck in the snow. The car may be unstuck by __________. making the car as light as possible to decrease the pressure on the ice surface placing a piece of cardboard under the tires to increase friction pressing the gas pedal as much as possible to make the wheels spin faster Gravity is an attractive force. In other words, gravity always acts to pull objects closer to each other. As far as we know, gravity exists between any two objects in the universe
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