One type of rifle used by the military fires a bullet with a mass of 0.000356 kg that exits the rifle's barrel with a speed of 910 m/s. What is the bullet's kinetic energy (in J)? ______J Again, notice how higher speed has a huge effect on kinetic energy. Let's try a few more examples of reasoning with kinetic energy. Two rocks are moving at the same speed. Rock #2 has the mass of rock #1. The kinetic energy of rock #2 is then ____________ the kinetic energy of rock #1. Two identical cars have the same mass. Car #2 is moving at the speed of car #1. The kinetic energy of car #2 is then____________ the kinetic energy of rock #1.
One type of rifle used by the military fires a bullet with a mass of 0.000356 kg that exits the rifle's barrel with a speed of 910 m/s. What is the bullet's kinetic energy (in J)? ______J Again, notice how higher speed has a huge effect on kinetic energy. Let's try a few more examples of reasoning with kinetic energy. Two rocks are moving at the same speed. Rock #2 has the mass of rock #1. The kinetic energy of rock #2 is then ____________ the kinetic energy of rock #1. Two identical cars have the same mass. Car #2 is moving at the speed of car #1. The kinetic energy of car #2 is then____________ the kinetic energy of rock #1.
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Notice how much an effect speed has on kinetic energy, due to its dependence on speed squared. The kinetic energy of the fast-moving baseball that you found in the previous step skip is about the same, even a little more, than the walking student, even though baseball has much less mass. This is because of the baseball's much greater speed.
Here is another example that shows how speed greatly affects the kinetic energy.
One type of rifle used by the military fires a bullet with a mass of 0.000356 kg that exits the rifle's barrel with a speed of 910 m/s. What is the bullet's kinetic energy (in J)?
______J
Again, notice how higher speed has a huge effect on kinetic energy.
Let's try a few more examples of reasoning with kinetic energy.
Two rocks are moving at the same speed. Rock #2 has
the mass of rock #1. The kinetic energy of rock #2 is then ____________ the kinetic energy of rock #1.
Two identical cars have the same mass. Car #2 is moving at
the speed of car #1. The kinetic energy of car #2 is then____________ the kinetic energy of rock #1.
options for the last two above are 1/4,1/2,1/8,1/16
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