Law |
Definition |
Equations & terms |
1st |
Objects move or remain still in
the same way, as long as no net external force acts on them. |
Also known as law of inertia. |
2nd |
A net external force (due to
unbalanced forces) acting on an object affects the object's speed and/or direction; it
causes an acceleration directly proportional to the amount of force applied and in the
direction of that force. |
1) Also known as
law of acceleration.
2) Fnet = ma
3) Force has units of Newtons (N, where 1 N = 1 kgm/s2) |
3rd |
Where do the forces come from?
Other objects, and when one object exerts a force on a second, the second object exerts a
force (same magnitude, opposite direction) on the first object. |
1) Also known as
law of action/reaction forces.
2) Forces that actually move an object must come from a different
object |
