Vocabulary I
To move objects with more mass it takes more
force
This force pulls objects towards each other
gravity
Measured in newtons, the force of gravity on an object is
weight
An object that is balanced and doesn't move has this amount of net force acting on it
zero
This acts against the motion of 2 objects that touch, run, roll, or slide against each other
Objects made of iron can by attracted be this
magnetic force
In order to accelerate, objects with more mass need more
force
When an object has a force greater than zero acting on it what happens to the object
moves in the direction of greater force
Telling someone where you are is giving your
position
Your frame of reference helps you to know you are in
motion
A ball will continue to roll until a net force acts on it. This is an example of
inertia
Formula to measure speed
speed=distance/time
To know an objects speed you need to know time as well as
distance
An object won't move until a net force acts on it because of
inertia
People in history studied the motion of objects read what others wrote and did this
experiments
Four ways a force can change an object's motion
Start, stop, speed up, change direction