Term
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Definition
| anything that's tossed, thrown, or dropped in a gravitational field |
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Term
| Which velocity stays constant during the flight of a projectile? |
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Definition
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Term
| What is the only equation you use with the horizontal motion of a projectile? |
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Definition
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Term
| What velocity component in affected by the acceleration of gravity? |
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Definition
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Term
| What equations do you use with the veritcal component? |
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Definition
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Term
| What is the first thing you do in solving a horizontally shot projectile? |
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Definition
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Term
| If a projectile is short horizontally from a height of 7 m with a horizontal speed of 20 m/s how far away will it land? |
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Definition
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Term
| IF an object is thrown horizontally and another object is dropped at the same time, which object will hit first? |
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Definition
| they will hit at the same time |
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Term
| What are the steps in solving projectiles shot at general launch angles? |
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Definition
| Find the x and y components |
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Term
| What are the chracteristics of the flight of a projectile shot over a level surface? |
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Definition
| tiem up=time down; x is constant |
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Term
| At what angle will a projectile have the longest range? |
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Definition
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Term
| What is uniform circular motion? Is an object in uniform circular motion accelerating? |
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Definition
| when an object is moving in a circular path at a constant speed; yes it is accelerating because it is changing direction |
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Term
| What forces cuases an object to follow a circular path? What is the equation? |
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Definition
| centripetal force; Fc=mv^2/r |
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Term
| What is the source of the centripetal force? |
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Definition
| any of the common forces (gravity, friction, tension, normal) |
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Term
| What is the equation to find minimul velocity for an object to complete a vertical circle? |
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Definition
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Term
| Who were tycho brahe and johannes kepler? |
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Definition
| Tycho was a dane who had an observatory who kept accurate records of the movement of the planets. Kepler knew Tycho had the data, went to work for Brahe and stole the data and created the 3 laws of planetary motion |
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Term
| What is the universal law of gravitation? |
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Definition
| the force of gravity is directly proportional to the products of the masses and inversely proportional to the distance squared |
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Term
| What are the three laws of planetary motion? |
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Definition
1. all planets about the sun in ellipses
2.a planet sweeps out equal areas at equal time (palnets speed up as they approach the sun)
3. law of periods--the ratio of the period squared to the radius cubed is a constant |
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Term
| What is an inverse square law? |
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Definition
| double the distnace, the inverse square is 1/4 |
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Term
| Who determined the universal gravitation constant? |
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Definition
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Term
| What is a gravitational field? |
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Definition
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Term
| What is an astronomical unit? |
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Definition
| distnace from earth to sun |
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Term
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Definition
| a deviation from a normal orbit |
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Term
| What planets were discvoered because of perturbation? |
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Definition
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Term
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Definition
| an area around an object in which a force can be felt |
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Term
| HOw does the gravitational field change as you go beneath the surface of the earth? |
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Definition
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Term
| What the value of the gravitational field at the center of the earth? |
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Definition
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Term
| Any force can be centripetal if it _____. |
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Definition
| makes something go in a circle |
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Term
| What are the two components of velocity? |
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Definition
| gravity and horizontal velocity |
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Term
| What are three characteristics of the horizontal component of velocity? |
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Definition
| it is constant, not accelerated, not influenced by gravity |
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Term
| What are two chracteristics of the vertical component of velocity? |
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Definition
| it undergoes accelerated motion and it is accelerated by gravity |
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