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Circular Motion/ Schoep's physics

Terms in this set (33)

When an object is moving with uniform circular motion, the tangential speed is
constant
When an object is moving with uniform circular motion, the centripetal acceleration of the object
is directed towards the center of motion
What term describes a change in speed of an objects circular motion?
tangential acceleration
Which of the following can be a centripetal force?
all of the above (friction, gravity, tension)
What is the term for net force directed towards the center of an objects circular path?
centripetal force
The centripetal force on an object in circular motion is
in the plane of the object's motion and perpendicular to the tangential speed
The centripetal force on an object in circular motion in is (2)
in the same direction as the centripetal acceleration (2)
When a car makes a sharp left turn, what causes the passengers to move toward the right side of the car?
Inertia
A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line?
Inertia (2)
Tides are caused by
differences in the gravitational force of the moon at different points on Earth.
Why does an astronaut weigh less on the moon than on Earth?
the gravitational field strength is less on the moon's surface than on the earth's surface
If you lift an apple from the ground to some point above the ground, the gravitational potential energy in the system increases. This potential energy is stored in
the gravitational field between earth and the apples
An object's tendency to resist acceleration is measured by the object's
inertial mass
The degree to which an object attracts other objects is measured by the object's
gravitational mass
Which of the following confirms that gravitational mass and inertial mass are equivalent?
Free- fall acceleration is is the same at all points where the gravitational field strength is the same.
In this text, which of the following symbols represents gravitational field strength?
G
In this text, which of the following symbols represents the constant of universal gravitation?
Fg
Which of the following equations expresses newtons law of universal gravitation?
Fg= G* m(1)m(2)/r^2
When calculating the gravitational force between two extended bodies, you should measure the distance
from the center of each body
Kepler developed his laws of planetary motion as he tried to reconcile
Ptolemaic theory with copernican theory
Until the middle of the 16th century, most people believed ____ was at the center of the universe.
the earth
In the figure above, according to Kepler's laws of planetary motion
If Δt(1)=Δt(2) then A(1)=A(2)
Newton's Law of Universal Gravitation
can be used to derive Kepler's third law of planetary motion
When an astronaut in orbit experiences apparent weightlessness,
no gravitational forces act on the astronaut
Which of the following quantities measures the ability of a force to rotate or accelerate an object around an axis?
lever arm
Where should a force be applied on a lever arm to produce the most torque?
farthest from the axis of rotation.
If you want to open a swinging door with the least amount of force, where should you push on the door?
as far from the hinges as possible
If you cannot exert enough force to loosen a bolt with a wrench, which of the following should you do?
use a wrench with a longer handle
Suppose a doorknob is placed at the center of a door. Compared with a door whose knob is located at the edge, what amount of force must be applied to this door to produce the torque exerted on the other door?
two times as much.
What kind of simple machine are you using if you pry a nail from a board with the back of a hammer?
a lever
which of the following is not a valid equation for mechanical advantage
MA=Wout/Win
What quantity measures the output force of a machine relative to the input force?
mechanical advantage
What quantity measures the work done by a machine relative to the work done on a machine?
efficiency
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