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Chapter Test A Circular Motion and Gravitation
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Gravity
Terms in this set (15)
When an object is moving with uniform circular motion, the object's tangential speed...
is constant
The centripetal force on an object in circular motion is
in the same direction as the centripetal acceleration
A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line?
Inertia
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 the Earth and the apple
When calculating the gravitational force between two extended bodies, you should measure the distance
from the center of each body
The gravitational force between two masses is 36 N. What is the gravitational force if the distance between them is tripled?
(G = 6.673 *10^-11 N•m2/kg2)
4.0 N
The equation for the speed of an object in circular orbit is vt= the square root of G times m/r. What does m represent in the equation?
The mass of the central object
How would the speed of Earth's orbit around the sun change if Earth's mass increased by 4 times?
It would increase by a factor of 2
When an astronaut in orbit experiences apparent weightlessness,
the net gravitational force on the astronaut is not balanced by a normal force
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
A heavy bank-vault door is opened by the application of a force of 3.0*10^2 N directed perpendicular to the plane of the door at a distance of 0.80 m from the hinges. What is the torque?
240 N*m
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
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