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### 37 Cards in this Set

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 The difference between impulse and impact force involves the time the force acts A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared to the force that stops the car, the force needed to stop the truck is greater Is it correct to say that impulse is equal to the change in momentum. Yes The impulse-momentum relationship is a direct result of Newton's second law Compared with the force that brings a small car to a stop, the force required to bring a heavy truck traveling at the same speed to a stop depends on the time involved An object is raised above the ground gaining a certain amount of potential energy. If the same object is raised twice as high, it gains twice as much potential energy If you push an object twice as far while applying the same force, you do twice as much work A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is doubled A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of power A rock is thrown upward at 35 degrees with respect to the horizontal. As it rises, its horizontal component of velocity remains unchanged Exert 2 N for a distance of 1 m in 1 s and you deliver a power 2 W Exert 200 J in 50 s and your power output is 4 W An object that has potential energy may have this energy because of its location Heat energy is measured in units of joules and calories A machine puts out 200 W of power for every 1000 W put into it The efficiency of the machine is 20% When the distance between two stars decreases by half, the force between them increases to four times as much A toy cart moves with a kinetic energy of 40 J. If it moves with three times of initial speed, its kinetic energy will be 360 J When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is copper expands more than iron. The force of gravity on a 600-N woman standing on the Earth's surface is 600N Moon is most responsible for the Ocean tides The main reason ocean tides exist is that the pull of the moon is greater on oceans closer to the moon and less on oceans farther from the moon When you touch a cold piece of ice with your finger, energy flows from your finger to the ice. An Earth satellite is simply projectile freely falling around the Earth A ball thrown straight upward takes 20 s to go up and return to the ground. Because of air resistance, the time taken for the ball just to go up is less than 10 s. Planets would crash into the sun if it weren't for their tangential velocities Earth satellites are typically more than 100 km high so as to be above the Earth's atmosphere. The fact that a thermometer "takes its own temperature" illustrates thermal equilibrium Compared to a giant iceberg, a hot cup of coffee has higher temperature, but less thermal energy. Before ice can form on a lake, all the water in the lake must be cooled to 4eC Ice tends to form at the surface of bodies of water When an iron ring is heated the hole becomes larger Boiling Points 100eC, 212eF, 373.15K Frozen Points 0eC, 32eF, 273.15K 1 calorie = how many Joules 4.18 Standard Unit of temperature is Kelvin 1st on Force Galileo