science chapter 3

Question 1

the transfer of energy that occurs when a force is applied over a distance

Answer 1

work

Question 2

forces that don’t make object move have no __________.

Answer 2

work

Question 3

calculation for work

Answer 3

f l d

Question 4

the rate at which work is done

Answer 4

power

Question 5

calculation for power

Answer 5

p l t

Question 6

any device that makes doing something easier

Answer 6

machine

Question 7

the force originally applied before a machine changes it

Answer 7

input force

Question 8

the product of the input force after being put into a machine

Answer 8

output force

Question 9

the ratio of a machine’s output force produced to the input force applied

Answer 9

mechanical advantage

Question 10

calculation for mechanical advantage

Answer 10

in l out

Question 11

the mechanical advantage if no friction existed

Answer 11

ideal mechanical advantage

Question 12

do work using only one movement

Answer 12

simple machines

Question 13

a simple machine made up of a bar that pivots, or rotates, about a fixed point.

Answer 13

lever

Question 14

the point about which a lever pivots

Answer 14

fulcrum

Question 15

first class lever

Answer 15

soda tab
in(down) out(up)
—————————-
f

Question 16

second class lever

Answer 16

wheelbarrow
in(up) out(up)
——————————
f

Question 17

third class lever

Answer 17

tweezers
in(up) out(up)
—————————————-
f

Question 18

calculation for mechanical advantage of levers

Answer 18

MA = input L / Output L

Question 19

distinguishes different types of levers

Answer 19

fulcrum

Question 20

an axle attached to the center of a wheel and both rotate together (like a screwdriver)

Answer 20

wheel and axle

Question 21

calculation of ideal mechanical advantage of wheel and axle

Answer 21

radius wheel / radius axle

Question 22

a flat, sloped surface (like a ramp)

Answer 22

inclined plane

Question 23

Ideal Mechanical advantage of Inclined Planes

Answer 23

length / height

Question 24

a sloped surface that moves

Answer 24

wedge

Question 25

an inclined plane wrapped around a cylinder

Answer 25

screw

Question 26

a simple machine that is a grooved wheel with a rope and cable wrapped around it

Answer 26

pulley

Question 27

two or more simple machines that operate together (can opener)

Answer 27

compound machine

Question 28

wheel and axle with teeth around the wheel

Answer 28

gears

Question 29

wedge MA

Answer 29

length / width

Question 30

pulley MA

Answer 30

of strings in system (not including one u pull)