Answer | Question |
fixed point that a lever pivots around- | fulcrum |
machine that utilizes two or more simple machines | compound machine |
rate at which works done | power |
a device that changes the amount of force exerted, the distance over which a force is exerted, or the direction in which force is exerted | machine |
made of a grooved wheel, with a rope or cable rapped aroun fit | pulley |
flat sloped surface | inclined plane |
of 2 circular objects fastened together that rotate a common axle | wheel/axle |
thick at one end tapers to be thin at the other en | wedge |
rigid bar that is free to pivot on a fixed point | lever |
an inclined plane wrapped around a cylinder | screw |
example of an inclined plane is a | ramp |
wheel and axl example- | bicycle |
example of a wedge | axe |
example of a lever | seesaw |
example of a screw | twisting a cap off |
water molecule is- | H2O |
baking soda- | NaHCO3 |
salt- | NaCI |
carbon dioxide- | CO2 |
H2O2 | peroxide |
CO | carbon monoxide |
CH4 | methane |
Fe2O3 | rust |
O3 | ozone |
C6H12O6- | glucose |
describe the advantages and disadvantages on an inclined plane | its easier to push things down than it is up… less force for moving objects down and greater force for moving objects up |
How does the length around the threads of a screw compare to an inclined plane | an inclined plane wrapped around a cylinder |
write a statement for the relationship between work,force, and direction | work increases as the force and direction increases
force= work times distance |
what are the units for work | joule |
what is a machines ideal mechanical advantage | 100% |
Describe the lab with the levers9ruler, shapes,and penny0 | we used the rulers, shoes and pennies to create and inclined plane |
what is the pivot point of a lever | fulcrum |
there has to be less ---- force, than there is input force | output |
work = | force times distance |
percentage of input work that is converted into output work | efficiency |
example of a wheel/ axle | screwdriver |
unit measured in work | joule |
what are the three types of pulleys | fixed, movable, and fixed and movable |
what type of pulley does the input and output work go the same way | movable |
example of a wedge | zipper |
how many types of levers | 3 |
paint opener would be what kind of lever | 1st |
wheel barrow would be what type of lever | 2nd |
sweeping would be what type of lever | 3rd |
a type of lever that you push down and it goes up | 1st |
a type of lever that all the force is in the middle | 3rd |
a type of lever that you push up and it goes up | second |
Why is output work always less than input work in real situation? | some work is wasted overcoming the force of friction and gravity |