Newton's Laws
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13 Terms
Definition of Newton's First Law.
An object continues in a state of rest or uniform (moving with constant) velocity unless it is acted upon by a net or resultant force.
Definition of inertia.
The property of an object that causes it to resist a change in its state of rest or uniform motion.
Definition of weight.
The gravitational force the earth exerts on any object on or near its surface.
Definition of normal force.
The perpendicular force exerted by a surface on an object in contact with it.
Definition of frictional force.
The force that opposes the motion of an object.
What is the template for answering Newton's First Law discussion questions?
Name the law/definition being used and identify the applicable part of it; name all the variables and explain how the applicable ones affect one another; then describe the outcome accordingly.
Definition of Newton's Second Law.
When a net force is applied to an object of mass m, it accelerates in the direction of the net force. The acceleration is directly proportional to the net force and inversely proportional to the mass.
Definition of Newton's Third Law.
When object A exerts a force on object B, object B simultaneously exerts an oppositely directed force of equal magnitude on object A.
Definition of tension in a string or cable.
The tension in a string or cable is the same throughout the entire string or cable.
Formula when: Elevator is Moving up, speeding up (acceleration is upward) - [m = mass, g = 9.8 m/s² (magnitude), a = magnitude of acceleration, N = scale reading.]
N = mg + ma
Formula when: Elevator is Moving up, slowing down (acceleration is downward) - [m = mass, g = 9.8 m/s² (magnitude), a = magnitude of acceleration, N = scale reading.]
N = mg − ma
Formula when: Elevator is Moving down, speeding up (acceleration is downward) - [m = mass, g = 9.8 m/s² (magnitude), a = magnitude of acceleration, N = scale reading.]
N = mg − ma
Formula when: Elevator is Moving down, slowing down (acceleration is upward) - [m = mass, g = 9.8 m/s² (magnitude), a = magnitude of acceleration, N = scale reading.]
N = mg + ma