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ch 13 science

Stack #170656

QuestionAnswer
define power and give the formula for calculating it the rate at which work is done. power=work/time
what is work and how is it calculated? when force is applied to an object and the object moves in the same direction. work=forcexdistance
define the term efficiency a measure of how much useful work a machine can do
what is the law of conservation of energy? energy cannot be created or destroyed
what is a machine? any object that makes work easier
name the 6 simple machines simple lever, pulley, wheel & axle, simple inclined plane, wedge, screw
what simple machine decreases the force required to move an object while increasing the distance the object travels? inclined plane
how do you calculate the mechanical advantage of the following simple machines:a.inclined plane b.pulleys c.wheel & axle d.levers a. length of ramp/height of ramp b.? c. radius wheel/radius axle d. length of input arm/length of output arm
describe potential energy & kinetic energy. how are they related? potential-results from the position of an object. kinetic-results from an object's motion. related-?
what is the difference between an open and closed energy system? energy & matther are exchanged with their surroundings in an open energy system. energy but not matter is exchanged in a closed energy system
how many classes of levers are there? 3
give an example of each class of lever first-hammer. second-wheelbarrow. third-weights
what is a compound machine? scissors are an exapmle of which combined simple machines? two or more simple machines. & wheel & axle and wedge
what is the difference between nuclear fusion and nuclear fission? fusion makes the sun's energy & fission is nuclear energy
a screwdriver is an example of which simple machine? inclined plane. wedge?
what is gravitational potential energy? what does it depend on? energy between two objects by a vertical distance. depends on mass and height
Created by: stellarsarahh
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