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# Physics Study Guide

### Rotational Motion & Gravity Test

QuestionAnswer
ur pet hamster sits on a record player whose angular speed is constant. if he moves to a point twice as far from the center then his linear speed... doubles
since each rolling wheel of a railroad train is tapered, the narrow part of the wheel has a tangential speed that is smaller than that of the wide part
when a train makes a curve, different parts of the wheel rims cover a different distance in the same time
which moves faster in m/s on a merry-go-round: a horse on the inside or a horse on the outside near the outer rail? outside horse
a coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be the coin
a torque acting on an object tends to produce rotation
on a balanced seesaw, a boy three times as heavy as his partner sits 1/3 the distance from the fulcrum
the long, heavy tail of a spider monkey enables the monkey to easily vary its center of gravity
the chef at the infamous fattening tower of pizza tosses a spinning disk of uncooked pizza dough into the air the disks diameter increases during the flight, while its rational speed decreases
a baseball bat is balanced on a fulcrum. the center of gravity of the bat is located above the fulcrum
when doing somersaults, you'll more easily rotate when your body is balled up
for a system in mechanical equilibrium the resultant forces and torques must both be 0
2 people are balanced on a seesaw. if 1 person leans toward the center of the seesaw, that person's end of the seesaw will rise
a 1kg rock is suspended from the tip of a meter stick at the 0cm mark so that the meter stick balances like a seesaw when the fulcrum is at the 25cm mark. from this information, what is the mass of the meter stick? 1kg
a ball rolls down a hill mainly because of an unbalanced torque
to kick a football so it won't topple end over end, kick it so the force of impact extends through its center of gravity
stand a meterstick on its end and let go and it rotates to the floor. if you attach a heavy weight to its upper end and repeat, falling time will be more
a ring, a disk, and a solid sphere begin rolling down a hill together. the one to reach the bottom first is the sphere
suppose you're on a ferris wheel at a carnival, seated 10 m from the ferris wheel's axis. if you make a complete rotation each minute, your linear speed is 62.8 m/min
neglecting air resistance, which will roll from rest to the bottom of an incline first, an empty jar, or the same jar filled with peanut butter? the filled jar
according to newton, the greater the masses of interacting objects, the greater the gravitational force between them
according to newton, doubling the distance between 2 interacting objects divides by 4 the gravitational force between them
what is the force of gravity of a 500-newton woman on earth 500 N
if the mass of the earth somehow increases with no change in radius, your weight would increase also
a black hole is simply the remains of a giant star that has undergone gravitational collapse
consider 2 planets in space that gravitationally none of the options
if the radius of the earth somehow decreased with no change in mass, your weight would increase
if the sun were twice as massive its pull on the earth would double, the pull of the earth on the sun would double
a very massive object A & a less massive object B move toward each other under the influence of gravitation. which force, if either, is greater? the force on a and b are the same
2 objects move toward each other because of gravity. as the objects get closer, the acceleration of each increases
the force of gravity acts on all apples on an apple tree. some apples are twice as far from the ground as others. these twice as high apples, for the same mass, have practically the same weight
if you drop a stone into a hole drilled all the way to the other side of the earth the stone will speed up until it gets to the center of the earth
the factor most directly responsible for making a black hole invisible is its surface escape velocity
if the sun collapsed to a black hole, the earth's gravitational attraction to it would be the same
the earth is currently accelerating toward the sun (centripetal acceleration) if the sun collapsed into the black hole, this acceleration would stay the same
each of us weighs a tiny bit less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper. the reason for this is the mass of the building attracts us upward slightly
which pulls on the oceans of the earth with greater force the sun
which is most responsible for the ocean tides the moon
the main reason ocean tides exist is that the pull of the moon is greater on oceans closer to the moon and less on oceans farther from the moon
which produces a greater tidal effect in your body, the moon or a 1kg melon held above your head the melon
Created by: bgpalmers

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