a slanted surface used to raise an object is a(n) ______________________
inclined plane
NW/W: carrying laundry to the washing machine
not work
NW/W: pushing a box from the bottom of a hill to the top of the hill
Work
NW/W: pulling a sled across a field covered with snow
work
NW/W: lifting a book bag off the floor
work
NW/W: carrying a ball
not work
NW/W: throwing a ball
work
NW/W: hitting a ball
work
NW/W: dropping a ball
work
a device that does work with only one movement and changes the size or direction of a force is a(n) ________________________
simple machine
a bar that is free to pivot about a fixed point is a __________
lever
the rate at which work is done is called ___________
power
an inclined plane with two sloping sides forms a machine called a __________
wedge
an inclined plane wrapped around a cylinder post is a _______
screw
a winding mountain road is an example of a(n) ________
screw
when two or more simple machines work together, they are called a(n) __________________________
compound machine
an object is moving due west. you push the object due west. is work being done?
yes
which of the following is a moving inclined plane? (a see-saw, a staircase, a pulley, a wedge)
wedge
the effort force you exert is the _________ force
input
the effort force a machine exerts is the ____________ force
output
the mechanical advantage that makes work easiest is one that is ________ (large, small, or zero)
large
in order for work to be done, what two things MUST be in the same direction?
force and motion
a _______ is an inclined plane wrapped around a cylinder
screw
what is the difference between a wedge and an inclined plane?
wedge is a moving inclined plane
C/S: lawnmower
compound
C/S: wheel and axle
simple
C/S: see-saw
simple
C/S: shovel
simple
C/S: can opener
compound
C/S: bicycle
compound
C/S: baseball bat
simple
C/S: tooth
simple
C/S: can
compound
6S: knife
wedge
6S: wheelchair ramp
inclined plane
6S: threaded bolt
screw
6S: teeth
wedge
6S: leaf rake
lever
6S: door knob
wheel and axle
6S: window blinds
pulley
6S: nail
screw