Science Review

Michele Brown · 20問 · 2年前

通報

問題一覧

machines that are built by putting together two or more simple machines are call

compound machines

you exert an input force on a hammer. the hammer exerts a(n) force on the nail.

output

the amount by which a machine multiplies an input force is called the .

mechanical advantage

a dressmaker is cutting fabric. She applies 18 J of work to the scissors. The scissors apply 15J of work to the fabric as it cuts. What is the efficiency of the scissors?

83%

which one of the following is NOT an example of work being done?

the moon orbiting earth

find the force needed to lift a 2000N rock, using a jack with a mechanical advantage of 10

200N

a worker applies a force of 20N to pry open a window that has a resistance force of 500N. what is the mechanical advantage of the crowbar?

joe is using a crowbar to remove a tree stump. He applies 2066 J of work to the crowbar. The output work of the crowbar is 1240 J. what is the efficiency of the crowbar?

60%

a winding mountain road is an example of a(n)___.

inclined plane

the force exerted by your foot on the pedal to ride your bike is an example of .

input force

efficiency

output work and divide; input work

ideal mechanical advantage

radius of a wheel and divide; radius of axle

mechanical advantage

out put force and divide; input force

power

work and divide; time

work

force and times; distance

ratio of ouput force to input force

mechanical advantage

force you apply to a simple machine

input

device made it more than one simple machine

output focre

knife

wedge

leaf rake

lever

history study guide

history study guide

20問 • 2年前

table of elements

Michele Brown · 9問 · 2年前

table of elements

9問 • 2年前

Michele Brown · 54問 · 2年前

the correct periodic table of elements

the correct periodic table of elements

54問 • 2年前

chapter 8 test

chapter 8 test

Sci. Test Vocab

Sci. Test Vocab

chapter 15 test review

chapter 15 test review