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14 Cards in this Set

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An object has kinetic energy, but it stays in one place. What must it be doing?
spinning
How can the gravitational potential energy of something be negative?
if it is in a hole in the ground then it has negative gravitational energy.
What is elastic potential energy? Is there anthing around you now that possesses elastic potential energy?
springs and rubber bands
Describe the distinction between elastic and inelastic collisions. Give example of each.
elastic has same kinetic energy before and after. inelastic means it could be more or less.
How can a satellite's speed decrease without its angular momentum changing?
yes
Why do divers executing midair somersaults pull their legs in against their bodies?
to spin faster
Explain how the change in the force of air resistance on a falling body causes it to eventually reach a terminal speed.
can not fall faster than the gravitational pull
Describe how the magnitude of the graitational force between objects was first measured.
two mass of different size balanced on a beam
In the broadest terms, what causes tides?"
gravitational forces exerted on the earth by the moon
What mathematical "tool" did Newton develop that has been essential to advanced physics since then?
calculus
How does the velocity of a freely falling body change with time? How does the distance it has fallen change? How about the acceleration?
constant acceleration
What is centripetal acceleration? What is the direction of the centripetal acceleration of a car going around a curve?
changes in direction as well as speed. towards the inside of the curb
If a ball is thrown straight up in to the air, what is its acceleration as it moves upward? What is its acceleration when it reaches its highest point and is stopped at an instant?
cosant exceleration going up then 0 at the top
What does the slope of an distance-versus-time graph represent physically?
equals the acceleration