# Shared Flashcard Set

## Details

Ch 5/6 Centripital Force and Gravitation Physics
Ch 6 Gravitation Physics for Scientist and Engineers 3rd ed Giancoli
22
Physics
11/04/2013

## Additional Physics Flashcards

Term
 A stone, of mass m, is attached to a strong string and whirled in a vertical circle of radius r. At the exact top of the path the tension in the string is 3 times the stone's weight. The stone's speed at this point is given by
Definition
 A: 2√(gr) 3Fg = Ft(centripital) - Fg 3mg = (mv^2/r) - mg
Term
 A stone, of mass m, is attached to a strong string and whirled in a vertical circle of radius r. At the exact bottom of the path the tension in the string is 3 times the stone's weight. The stone's speed at this point is given by
Definition
 A: √(2gr) 3Fg = Ft(centripital) + Fg 3mg = (mv^2/r) + (mg)
Term
 A stone is whirled in a vertical circle on a cord. Halfway up the _____ is towards the center of the circle and the ____ is down.
Definition
 tension force , weight
Term
 A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with the track at the top of the loop, what is the minimum value for its centripetal acceleration at this point?
Definition
 g downward The acceleration must be towards the center of the circle. Review Examples in Chapter 5 in Giancoli.
Term
 girl attaches a rock to a string, which she then swings counterclockwise in a horizontal circle. The string breaks at point P on the sketch, which shows a bird's-eye view (i.e., as seen from above). What path will the rock follow? [image]
Definition
 B Tangential Velocity
Term
 Two objects are travelling in circular orbits. Object A is travelling at twice the velocity of object B in a circle with a diameter of twice that of B. The centripetal acceleration of A is _____that of B.
Definition
 of A is twice that B.
Term
 A cannon ball is fired horizontally off a high cliff over a great distance. If air resistance can be ignored the path it follows is
Definition
 part of an ellipse.
Term
 The variation of g over the surface of the earth does not depend upon
Definition
 rotation of the Earth. g=(GM/d^2) note: no frequency
Term
 There are four forces in nature.  What are they and which one allows you to close a door by pushing on it?
Definition
 Electric - allows you to push  Gravity Nuclear Weak
Term

## A ball of mass m is moving in a circle with uniform speed on a horizontal surface with friction at the end of a radial metal rod. The net force is

Definition
 is along the rod.
Term
 Two bodies of equal mass are separated by a distance R. If you double the distance between them the new gravitational force will be
Definition
 one fourth the old force. Fg = m(GM/d^2) Fg = m(GM/(2d^2)) Fg = m(GM/4d^2)
Term
 Two bodies of equal mass are separated by a distance R. If you double each mass then the new force will be
Definition
 four times the old force.   Fg = m(GM/d^2) Fg = 2m(G2M/d^2)
Term
 Two bodies of equal mass are separated by a distance R. If you double one mass then the new force will be
Definition
 twice the old force. Fg = m(GM/d^2)Fg = 2m(GM/d^2)
Term
 Two bodies of equal mass are separated by a distance R. If you double each mass and double the distance between them, the new force will be
Definition
 the same as the old force. Fg = m(GM/d^2) Fg = 2m(G2M/(2d^2) Fg = 2m(G2M/4d^2)
Term
 The Earth moves faster in the winter when its closest to the Sun. This is an example of which law.
Definition
 Kepler's Second Law   An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time
Term
 Kepler's Third Law can be used to relate the motions of the moon and _____
Definition
 space shuttle   compares the orbital period and radius of orbit of a planet to those of other planets.
Term
 If the mass of the Earth was quadrupled and nothing else was changed
Definition
 g would increase by a factor of 4   g = (GM/d^2) g = (G4M/d^2)
Term
 A planet with twice the mass and twice its radius has a value of g
Definition
 1/2 that of Earth. g=(GM/d^2) g=(G2M/(2d^2))g=(G2M/4d^2)
Term
 Four equal masses are arranged in a perfect square. The direction of the force on the one in the lower left hand corner
Definition
 is at 45 degrees
Term
 Four equal masses are arranged in a perfect square. The magnitude of the force on the one in the lower left hand corner due to the one diagonally across from it
Definition
 would be half the magnitude of the force from either of the other two masses.
Term
 The speed of a satellite in orbit does not depend on
Definition
 its mass. mg = mv^2/r g=v^2/r
Term
Definition
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