Ch 65 Flashcards
What kind of quantity is force (N)?
Vector
What is the equation used to calculate force?
F = m*a
What is the equation used to calculate weight (W)?
W = m*g
What is Newton’s first law?
A body either at rest or motion will continue to stay unless net force acts upon it
What is Newton’s second law?
Acceleration depends on both the force acting upon it and mass of the body
What is Newton’s third law?
To every action is there is equal but opposite reaction
How do you find the Weight in x direction?
W = W * sinθ
How do you find the Weight in y direction?
W = W * cosθ
How do you calculate gravitational force?
F = (Gmm) / r2
Unlike translational motion, rotational motion depends on
The distance from the force to the axis of rotation
Which quantity causes rotation?
Torque
What is the formula for Torque?
T = rFsinθ
Maximum torque occurs when θ =?
90
Minimum torque occurs when θ=?
0
Torques causing rotation in clockwise direction have what value?
Negative
Torques causing rotation in counterclockwise direction have what value?
Positive
What is the force that needs to be overcome to set an object in motion?
Static friction
Friction acts how relative to motion?
Opposite
In circular motion, how is the velocity vector?
Tangent to the circular path
In circular motion, how is the acceleration?
Always directed towards the center
What is the formula for centripetal acceleration?
a = v^2 / r
In circular motion, how is the centripetal force?
It is also directed towards the center
What is the formula for centripetal formula?
F = m * v^2 / r
