Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Physics Unit 4
Gravity, Rotational, & Projectile Motion
| Question | Answer |
|---|---|
| tangential speed | the linear speed tangent to a curved path, such as in circular motion |
| rotational speed | the number of rotations or revolutions per unit of time; often measured in rotations or revolutions per second or minute |
| rotational inertia | the property of an object to resist any change in its state of rotation; if at rest, tends to stay at rest OR if rotating, tends to stay rotating unless acted upon by an external net torque |
| torque | the product of force & lever-arm distance, which tends to produce or change rotation |
| center of gravity (CG) | the average position of weight or the single point associated with an object where the force of gravity can be considered to act |
| center of mass (CM) | the average position of the mass of an object |
| equilibrium | the state of an object in which it is not acted upon by a net force or a net torque |
| centripetal force | a force directed TOWARD a fixed point, usually the cause of circular motion |
| centrifugal force | an OUTWARD force apparent in a rotating frame of reference; fictitious in the sense that it is not part of an interaction but is a result of rotation, with no reaction-force counterpart |
| linear momentum | the product of the mass of an object & its linear velocity |
| angular momentum | the product of a body's rotational inertia & rotational velocity about a particular axis |
| Conservation of Angular Momentum | when no external torque acts on an object or a system of objects, no change of angular momentum can occur; the angular momentum before an event equals the angular momentum after an event |
| Law of Universal Gravitation | every body in the universe attracts every other body with a force that, for two bodies, is directly proportional to the product of their masses & inversely proportional to the square of the distance between their centers |
| Inverse-Square Law | a law that relates the intensity of an effect to the universe square of the distance from the cause; gravity follows this law |
| weight | the force that an object exerts on a supporting surface which is often due to the force of gravity |
| weightless | being without a support force, as in free fall |
| Spring Tides | high or low tides that occur when the sun, earth, & the moon are all lined up; makes the high & low tides higher & lower than average |
| Neap Tides | tides that occur when the moon is midway between new & full, in either direction; makes high tides lower than average & low tides higher than average |
| gravitational field | the influence that a massive body extends into the space around itself, producing a force on another massive body; measured in N/kg |
| black hole | a concentration of mass that results from gravitational collapse, near which gravity is so intense that not even light can escape |
| projectile | any object that moves through the air or through space under the influence of gravity |
| parabola | the curved path followed by a projectile under the influence of ONLY constant gravity |
| satellite | a projectile or small celestial body that orbits a larger celestial body |
| ellipse | the oval shaped path followed by a satellite |
| circle | a special kind of ellipse where the foci are together at one point |
| escape speed | the speed that a projectile must reach to escape the gravitational influence of earth or of another celestial body to which it is attracted |
| Kepler's First Law | The path of each planet around the sun is an ellipse with the sun at one focus |
| Kepler's Second Law | the line from the sun to any planet sweeps out EQUAL areas of space in EQUAL time intervals |
| Kepler's Third Law | the square of the orbital period of a planet is directly proportional to the cube of the average distance of the planet from the sun |
Created by:
ginaliane
Popular Physics sets