Torque Flashcards
Center of gravity
Point around a systems weight is equally distributed . Determines how body responds to external forces
AS OPPOSED TO
center of mass
What is centric force
When a force acts directly at center of gravity
Produces translation ONLY (rectilinear)
What are eccentric forces
When a force acts away from the center of gravity
Produces some translation and rotation
What is a pure moment
When 2 forces that are equal in magnitude but opposite in direction act equidistant from center of gravity
No action result
What is a couple
Is 2 eccentric forces
Result in rotation ONLY
What is axis of rotation
A fulcrum
What is torque
Force that has a tendency to rotate objects about an axis
What are units for torque
Nm
What happens when you slide hand up wrench?
Sliding hand up decreases power but increases control
Sliding hand down decreasss control but increases power
What does each lever consist of ?
Rigid body-sustem being moved
Fulcrum
Effort-input force
Resistance -output force
What is mechanical advantage
It is the effectiveness of the lever determined by mechanical advantage
Output force /Input force
Example of mechanical advantage
A force can balance a larger resistance when forearm is longer than resistance arm
As mechanical advantage increases, the lever is built for strength but sacrifices speed
What is a wheelbarrow an example of
Second class lever
Fulcrum on one side of lever resistance in middle and effort applied on either side
What is the moment art
Perpendicular distance between line of action and axis of rotation
What are the factors that influence the size of the torque
Magnitude of torque, point of application, direction
