Circular Motion
The acceleration directed toward the center of a circular path is called...
What is centripetal acceleration
The force of attraction between massive bodies that is due to gravitation.
What is gravitational force?
State this law. An imaginary line drawn from the sun to any planet sweeps out equal area in equal time intervals
What is Kepler's second Law of Planetary Motion
What is a force that causes an object to rotate about a given point?
What is a torque
This is the point in a body that moves as if the entire mass were concentrated there and as if all of the forces were applied there
What is center of mass
This is the line at which a rotation that revolves about a single axis occurs
What is the axis of rotation
Gravitational force depends on these two factors.
What are mass and distance?
If force is inversely proportional to distance squared, as stated in the law of universal gravitation, the resulting orbit must be this
What is an ellipse
This is the perpendicular distance from the axis of rotation to a line drawn along the distance of the force
What is a lever arm
This is the position at which the gravitational force acts on the external objects as if they were a point of mass
What is center of gravity
an apparent force that acts outward on a body moving around a center, arising from the body's inertia, is known as...
What is centrifugal force
This region of space is so massive that nothing, not even light, can escape the pull of its gravity
What is a black hole
Pluto, and its moon, which is named this, both orbit a point that lies between the bodies
What is Charon
*DAILY DOUBLE*
The symbol for torque (T), the T is the Greek letter named this
What is Tau
The tendency of a body that is rotating about a fixed axis to resist a change in this rotating motion is called...
What is moment of Inertia
In a circular motion, an acceleration due to a change in speed is called this
What it tangential speed
This depends only on Earth's mass and radius
What is free-fall acceleration
The assumption of a circular orbit provides a close approximation for real orbits in our solar system because all the planets except this one have orbits that are nearly circular
What is Mercury
There are six simple machines: Name three of them
What is lever, pulley, inclined plane, wheel and axle, wedge, or screw
If the net torque on an object is zero, the object is said to be in this
What is translational equilibrium
*DAILY DOUBLE*
The net force that is directed toward the center of an object's circular path is called...
What is centripetal force
This law shows that the value of gravity depends on mass and distance
What is Newton's Law of Universal Gravitation
In 1543, this Polish astronomer published, On the Revolutions of the Heavenly Spheres, in which he proposed that Earth and the other planets orbit the sun in perfect circles
Who is Nicolaus Copernicus
(MA=output force/input force=F out/F in) is the formula for this
What is mechanical advantage
The units of moments of Inertia are written in this form
What is (Kg)(m^2)