Term

Definition
anything that's tossed, thrown, or dropped in a gravitational field 


Term
Which velocity stays constant during the flight of a projectile? 

Definition


Term
What is the only equation you use with the horizontal motion of a projectile? 

Definition


Term
What velocity component in affected by the acceleration of gravity? 

Definition


Term
What equations do you use with the veritcal component? 

Definition


Term
What is the first thing you do in solving a horizontally shot projectile? 

Definition


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? 

Definition


Term
IF an object is thrown horizontally and another object is dropped at the same time, which object will hit first? 

Definition
they will hit at the same time 


Term
What are the steps in solving projectiles shot at general launch angles? 

Definition
Find the x and y components 


Term
What are the chracteristics of the flight of a projectile shot over a level surface? 

Definition
tiem up=time down; x is constant 


Term
At what angle will a projectile have the longest range? 

Definition


Term
What is uniform circular motion? Is an object in uniform circular motion accelerating? 

Definition
when an object is moving in a circular path at a constant speed; yes it is accelerating because it is changing direction 


Term
What forces cuases an object to follow a circular path? What is the equation? 

Definition
centripetal force; Fc=mv^2/r 


Term
What is the source of the centripetal force? 

Definition
any of the common forces (gravity, friction, tension, normal) 


Term
What is the equation to find minimul velocity for an object to complete a vertical circle? 

Definition


Term
Who were tycho brahe and johannes kepler? 

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 


Term
What is the universal law of gravitation? 

Definition
the force of gravity is directly proportional to the products of the masses and inversely proportional to the distance squared 


Term
What are the three laws of planetary motion? 

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 periodsthe ratio of the period squared to the radius cubed is a constant 


Term
What is an inverse square law? 

Definition
double the distnace, the inverse square is 1/4 


Term
Who determined the universal gravitation constant? 

Definition


Term
What is a gravitational field? 

Definition


Term
What is an astronomical unit? 

Definition
distnace from earth to sun 


Term

Definition
a deviation from a normal orbit 


Term
What planets were discvoered because of perturbation? 

Definition


Term

Definition
an area around an object in which a force can be felt 


Term
HOw does the gravitational field change as you go beneath the surface of the earth? 

Definition


Term
What the value of the gravitational field at the center of the earth? 

Definition


Term
Any force can be centripetal if it _____. 

Definition
makes something go in a circle 


Term
What are the two components of velocity? 

Definition
gravity and horizontal velocity 


Term
What are three characteristics of the horizontal component of velocity? 

Definition
it is constant, not accelerated, not influenced by gravity 


Term
What are two chracteristics of the vertical component of velocity? 

Definition
it undergoes accelerated motion and it is accelerated by gravity 

