CH 2
noncontact force that exists between all objects that have mass
gravity
Newton Law that states: object that has an unbalanced force acting on it will accelerate in the direction of that force
2nd
A ______ is a device that makes a task easier but does NOT decrease the amount of ______
machine, work
class of lever where input force between output & fulcrum
3rd
iron bolt & spiral staircase are examples of
screw
when net force on an object = 0, the forces acting on it are _____
balanced
when 2 forces meet, the one that strikes is the ____ force & the one being struck is the _____ force
action, reaction
Simple machine can change the _____ of a force.
ex. hammer pulling out a nail
direction
class of lever where fulcrum between input & output
direction
tendency of object to resist a change in motion
inertia
transfer of energy to an object by a force that makes an object move in the direction of the force is _____
measure in _____
work
Joule (Nm)
Simple machine can change the ______ the force acts.
ex. pry bar lifting up a rock
distance
screw drive & ferris wheel are examples of
wheel & axle
A moveable pulley ____ the force needed, but ____ the distance pulled.
decreases, increases
1st
Doing work can increase which 2 types of energy
kinetic & gravitational potential energy
Simple machine can change the _____ of a force.
ex. rake picking up leaves.
size
truck ramp & ceiling fan are examples of
inclined plane
compound
Newton Law that states: forces always occur in equal & opposite pairs or that every action has an equal & opposite reaction
3rd
rate at which "work" is done = ______
measured in _____
power
Watts (J/s)
class of lever where output force between input & fulcrum
2nd class
door stop & front teeth are examples of
wedge
the point about which a lever pivots
fulcrum