Linear Kinetics Flashcards
Define kinetics
The study of the forces that inhibit, cause, facilitate, or modify the motion of a body
What is kinetics concerned with
The forces that cause motion.
What is Newtons first law?
The law of inertia: Every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it
T/F If an object is in motion and travelling with a given velocity, there is a change in that linear velocity and the object keeps travelling without accelerating (a=o)
False, there is no change in linear velocity
Does Newtons first law of motion still apply if external forces act on the object?
Yes, if the sum of all forces is equal to zero
What are the constraints for static equilibrium
The sum of all external forces acting on an object is zero
What is the fundamental law of dynamics (Newton’s Second Law)
The change in motion of an object is proportional to the force impressed; and is made in the direction of the straight line with the force is impressed
How does Newtons first and second law differ?
In the second law, if an object is at rest, it will start moving and undergo linear displacement.
Also, if an object is in motion and travelling with a given velocity there WILL be a change in velocity
Is acceleration of the system proportional or inversely proportional to the mall of the system to which the force is applied?
It is inversely proportional
What is Newton’s Third Law?
To every action, there is always opposed an equal reaction: or the mutual actions of two bodies upon each other are always equal and directed to contrary parts.
Using Newton’s second and third law, explain what would happen if you were to try and push and offensive lineman that weighs more than you
According to Newton’s Third law, the force that he pushes against you is exactly equal to the force that you push against him.
According to Newtons second law, the larger the mass the smaller the effect. The smaller the mass the larger the effect. Because his mass is so large, the effect of your pushing force on him will be small because your mass is small relative to his, the effect of his pushing force on you will be greater.
What is universal gravitation?
F = mM/r^2
T/F All objects attract each other with a gravitational force that is inversely proportional to the square of the distance between the objects.
True
Does mass have a greater affect on horizontal or vertical acceleration?
Vertical
What does momentum define
A system’s quantity of motion
