L3;3,7,13 Flashcards
What is force? (The two definitions)
Force is a push or pull by one object onto the other
Force can change motion and or deform objects
What are the three factors that categorize force?
- Magnitude (M)
- Direction (D)
- Point of application
Force is a ______ quality
Vector
Bigger moment arm ______
Smaller moment arm _______
Slower, faster
If a torque is going clockwise, what direction is its vector?
If a torque is going counter clockwise, what direction is its vector?
Negative
Positive
What is torque?
This is the turning effect of a force
Torque is a vector (has magnitude and direction) and represented as curved arrows.
What is the formula for torque?
T= F x dt [NxM]
What is a moment arm?
This is the perpendicular distance between the force line of action and fulcrum.
What is static equilibrium?
If there is no resultant force or torque acting on an object, the object will not change.
What is a
Resultant force
Resultant torque
Resultant force= sum of all forces acting on an object
Resultant torque= sum of all torques acting on an object
What is the difference between mass and weight?
Mass=quantity of matter contained in an object
Weight= gravitational force that the earth exerts on a body
It is easier to initiate rotation when force is applied ________ and as _______ as possible from/to the fulcrum
Perpendicularly, far
Five characteristics that force generation is affected by
- Muscle length
- Cross sections area
- Moment arm
- Angle of attachment
- shortening velocity