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P. Science Test 2
| Question | Answer |
|---|---|
| If an object has kinetic energy, it also must have? | momentum |
| Energy of position or configuration is called | potential energy |
| A kWh is a unit that measures | energy |
| Kinetic energy = | 1/2 mass x speed2 |
| If i drop a baseball from the roof of a building, as it falls compared its potential and kinetic energies | potential decreases, kinetic increase |
| What is a machine | a device for multiplying forces or changing the direction of force |
| In an ideal pully system, a woment lifes a 100-N crate by pulling a rope downward with a force of 25 N. For every one-meter length of rope she pulls downward, the rate rises | 25 centimenters |
| A certain machine is 30% efficient. This means that machine will convert | 30% of the engergy input to useful work- 70% of the energy input will be wasted |
| Efficiency = | work done/ energy uses x 100% |
| A machine multiplies | force |
| Newton's most celebrated synthesis is of | earthly and heavenly laws |
| Intensity = | 1/ distance2 |
| The force of gravity between two planets depends on their | Masses and distance apart |
| If the masses of two palnets are each somehow doubled, the force of gravity between them | quadruples |
| If the mass of one planets is somehow doubled, the force of gravity between it and a neighboring planet would | double |
Created by:
hhorn00
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