Term
|
Definition
An object at rest will remain at rest OR an object in motion will maintain a constant velocity (and move in a straight line) if there is NO unbalanced force acting on it
*This tendency of an object to resist a change in its motion is known as inertia and it is directly related to the mass of the object. |
|
|
Term
|
Definition
| In the case when the object is at rest, it would be in static equilibrium. The forces acting on the object would sum to zero, and the object’s acceleration would be equal to zero |
|
|
Term
|
Definition
| If the object were moving at a constant velocity, it would be considered dynamic equilibrium |
|
|
Term
|
Definition
ΣF = ma
ΣF= sum of forces
m= mass
a = acceleration
If there is an unbalanced force acting on the object, it will accelerate. The direction of the acceleration will be the same as the direction of the unbalanced (i.e. net) force. |
|
|
Term
|
Definition
Whenever an object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object. Forces always come in pairs.
Note: these action/reaction pairs NEVER act on the same object. They therefore can never cancel each other out. |
|
|
Term
|
Definition
Weight
• Also knows as gravitational force. It is NOT mass.
• Close to the surface of the Earth or some other planet, Fg = mg (where “g” is the acceleration due to gravity).
• ALWAYS is directed straight down. |
|
|
