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science test 87
| Question | Answer |
|---|---|
| momentum | the product of the mass and velocity of an object inertia in motion |
| impulse | force times time interval |
| elastic collision | there is no loss in kinetic energy in the system |
| inelastic collision | there is loss of kinetic energy in the system |
| work | force times distance |
| energy | the property of a system that enables it to do work |
| kinetic energy | energy of motion |
| potential energy | energy that is stored and held in readiness |
| law of conservation of energy | energy cannot be created or destroyed it may be transformed from one form into another, but the total amount of energy never changes |
| machine | a device for multiplying forces or simply changing the direction of forces |
| fulcrum | the support , or point of rest, on which a lever turns in a moving body see-saw |
| power | a measure of how fast the work is done |
| tangential velocity | velocity parallel to the earths surface |
| law of universal gravitation | any body atrects any other body with a force that is directly proportional to the product of thier masses and inversly proportional to the square of the distance seperating them. |
| impulse-momentum relationship | the impulse applied to an object is equal to the change in its momentum |
| how do you increase momentum? | increase either mass or velocity |
| how do you decrease force with decreasing momentum | moving away rolling with the motion |
| how to increase force with momentum | go towards motion |
| how is momentum conserved in an elastic collision | momentum before = momentum after |
| how is momentum conserved in an inelastic collision | momentum after = momentum before |
| force unit | newton |
| work unit | joules |
| power unit | watt |
| energy unit | joules |
| momentum unit | kg times m/s |
| the difference between potential energy and kinetic energy | pe is stored energy ke is energy of motion |
| how do simple machines work? | uses a single applied force to do work against a single load force |
| work-energy theorem | work equals change in kinetic energy |
| inverse-square law | the thickness of paint decreases as the distance increases |
| equation for work | force times distance |
| equation for momentum | mass times velocity/speed |
| equation for kinetic energy | 1/2 (mass times speed squared) square the speed and rewrite equation |
| equation for potential energy | weight times height or mass time 9.8 m/s squared times height (mgh) |
| equation for power | force times distance over time or work over time |
| equation for gravitational force. | Gf = G times (m1 times m2 over d1) G=0.0000000000667408 |
| why would you rather slow down your runaway truck by hitting a haystack instead of a wall? | it extends the time needed to bring the momentum down to zero bigger time smaller force |
| how can a karate expert break a block of bricks with a bare hand. | time little so force big |
| how does bouncing effect momentum? | impulses are greater when the object bounces |
| why is momentum a vector quantity? | it has both direction and magnitude |
| define 1 joule of work | when a force of 1 N is exerted over a distance of 1 M |
| define efficiency | comparison of energy output to energy input in a given system |
| can gravity ever be zero? | no |
| when standing on a bathroom scale how are you in static equilibrium | the elastic force of the springs balances the gravitational force |
| how do the astronauts experience zero g in the international space station. | the station and the people accelerate equally toward the earth |
Created by:
ghost.is.boo
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