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ap exam 5/5/21
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Gravity
physics
Terms in this set (23)
escape velocity =
√2 * orbital speed
a pendulum is released. does it move with constant angular momentum and why?
No, bc only the force of gravity exerts torque, which changes its angular momentum (L)
can an object have zero velocity and nonzero acceleration at the same time?
Yes, but only for one instant in time
equation for center of mass of a system:
m1x1+m2x2
------------
m1+m2
(pick a reference point to measure x's from)
when calculating work, blocks being lifted have what kind of energy
Potential
blocks being lifted from the floor
we know:
-starts with all PE, which equals...
-use the equation...
-units in equation...
-final units...
-mgh
-Ug=mg*deltaY
-meters
-Joules
a compressed spring wants to...
stretch back out
-this means the forces exerted by the spring are in the opposite direction
a stretched spring wants to...
compress back to normal
-this means the forces exerted by the spring are in the opposite direction
when calculating periods of a spring system,
1/4 thru period =
3/4 thru period =
1. √2
2. 2√2
describe path of a falling object when horizontal force is exerted throughout its motion
straight diagonal line, constant slope
describe path of a falling object when horizontal force is exerted only in the beginning of its motion
curved line, increasing slope (magnitude), but going down
things to remember about impulse
-when problems talk about impulse, consider that theyre referring to the impulse of someone's hand throwing an object
-going against gravity, you would need a higher impulse to maintain the speed
how to determine if a quantity is greater than 0
look at the equation and see which quantities within it are positive. If theyre all positive then it has to be greater than 0
equation to consider in questions referring to maximum height:
E
P = ---
t
be careful with v-t graphs
-area underneath is restricted by...
-to help...
the x axis
draw diagrams of object's position at each time
ap physics really likes using the quantity...
√2
direction of impulse steps
draw diagram
draw arrows
label what object acts on what
if an object moves at constant speed, whats the acceleration
a=0
object moving up an incline; what forces do u need to consider
x&y: components of gravity
x: friction (at an angle)
y: normal (at an angle) {cancels y of gravity}
forces of a collision create what type of pair?
action/reaction
-meaning the forces will be equal in magnitude, opposite in direction
inertia represents...
an objects resistance to a change in its angular velocity
-angular equivalent to mass
a small mass far from the A of R has a ____ effect on the rotational inertia than the same amount of mass closer to the axis
larger
angular displacement ratio
arc length / radius
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