Dynamics Flashcards
*Information cited from the Physics Classroom https://www.physicsclassroom.com/Class/newtlaws/U2L2b.cfm#tension
What is a force?
It is a push or a pull on an object.
What is the formula used to calculate force?
F = ma (mass x acceleration)
What is a tension force and how is it represented ?
A force transmitted through string, cable or rope and is pulled tight by forces acting on opposite ends.The tension force is directed along the length of the wire and pulls equally on the objects on the opposite ends of the wire. And is represented by F*T
What is a normal force and how is it represented ?
Normal is the force resulting from the contact between two objects. On free body diagrams the vector arrow is drawn perpendicular to the contact surface NOT gravity.
It is represented by F*N.
What is the force of gravity and how is it represented and calculated ?
The force of gravity is the weight of an object not the mass. All objects upon earth experience a force of gravity that is directed “downward” towards the center of the earth.It is represented by Fg and calculated by Fg = mg.
What is net force?
Net force is the vector sum of all forces acting on an object.
a) Net force cannot be calculated if there is no acceleration.
What is a friction force and how is it represented ?
The friction force is the force that prevents an object from sliding past another. It is represented by Ff.
What is Newton’s First Law of Motion?
Inertia: A object in motion will remain in motion and an object at rest will remain at rest unless acted upon by a unbalanced force.
a) There are no specific units for inertia
b) Inertia is difficult to observe on Earth but much easier to observe in space.
c) There is no specific way to calculate inertia.
What is Newton’s Second Law of Motion?
Non zero net force will accelerate an object. The formula for net force is (mass x acceleration).
a) The acceleration of an object is directly proportional to the net force of the object and inversely proportional to the mass.
b) Newton’s 2nd Law can only be used to calculate the net force meaning the first step in a force problem is to find the magnitude of the net force.
If a forces cancel out on an object the object is said to be in _____________.
Equilibrium.
What happens when there is NO acceleration on an object.
There is no net force and since there is no acceleration there the object is moving with a constant velocity or the object is stationary.
