Lecture 16 Flashcards
What does having a long pole do for balance
Lowers the center of gravity
Increases moment of inertia
Action torque and reaction torque between the acrobat and the pole occurs if
The acrobat begins to fall clockwise, the pole would exert an equal but opposite direction torque on the acrobat
What is newtons third law of motion in angular motion
For every torque exerted by one object on another the other object exerts an equal torque back on the first object but in the opposite direction
Torques acting on two objects should have
However what is different
Same axis of rotation
The effects on the torques
What is work
If a force applied to an object and the object moves in the direction of that force, then the product of force and displacement is work
What is the equation of work
W = F x displacement
If force is not constant, then what does work equal
The product of average force exerted on the object and displacement
Average force x displacement
What happens when the force is oblique to the displacement
The only component that is in the direction of the displacement does work
e.g.
W = F1 x cos(a) x displacement
Mechanical work can be
Positive or negative
Positive work is
Done by a force acting on an object
If object displaced in same direction as the force
Negative work is
Done by a force acting on an object
If the object is displaced in the opposite direction as the force acting on it
What is energy
The capacity to do work
Mechanical energy is made up of
KE due to velocity
PE due to position
KE is
A moving object has the capacity to do work due to ites motion
KE = 1/2mv^2
PE is
The energy that an object has due to its position
Gravitational potential energy
mgh
