Motion and Design Vocabulary List #1
 
position – the location of an object

speed – a measurement of distance over time

force – a push or pull on an object

energy – the capacity to do work it can be used to move muscles,
            operate machines,  cook meals and heat rooms
 
machine – something that replaces human effort
 
gravity – the force that pulls things toward Earth
 
balanced forces – forces that have a net force of zero (equal force in
                              opposite directions)
 
unbalanced forces – forces that have a net zero force that is not
                                  zero (causes motion)
 
inertia  - the tendency of an object to remain at rest or in motion
             unless it is acted on by a force
 
momentum – the product of the mass and velocity of an object
 
friction – the force that acts on an object to stop motion