Physics 112 Ch4 Review
Terms
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- Inertia -
- The reluctance of an object to change its state of motion.
- Equilibrium -
- The state of a body or physical system at rest or in unaccelerated motion in which the resultant of all forces acting on it is zero.
- Newton’s first law –
- an object at rest will remain at rest, and an object in motion with constant speed will remain at constant speed unless acted on by an external unbalanced force (if ΣF = 0, then V = Constant).
- Newton’s third law –
- every action must produce an equal but oppositely directed reaction (F on A by B = -F on B by A).
- Normal force –
- a force that is perpendicular to the surface plane.
- Friction force -
- A force that resists the relative motion or tendency to such motion of two bodies in contact.
- Equilibrant –
- a force equal in magnitude to the resultant force but opposite in direction.
- Reaction force -
- An equal and opposite force exerted by a body against a force acting upon it.
- Coefficient of friction –
- ratio of the amount of friction by the surface and the normal force exerted by the force (μ f = Ff / N).
- Static Friction –
- A force that exist between two surfaces while motion is impending.
- Kinetic Friction –
- the frictional force between to surfaces while and object is moving.
- Free body diagram –
- A vector diagram which describes all forces acting in a particular body or object.