week 4 Flashcards
What is the result of adding vectors A, B, C, D, and E?
AE
Which law is applied to measure force?
Newton’s 3rd Law (Action-Reaction)
What do force plate transducers convert?
The force exerted into an electrical signal
What are the components into which applied ground reaction forces (GRF) can be broken down?
- Fz
- Fy
- Fx
What is a primary application of force plate data?
Linking kinetics and kinematics
Name three applications of force plate data.
- Performance enhancement
- Equipment design
- Injury prevention and rehabilitation
A force whose line of action passes ________ the CoG of the body is called a concentric force.
[through]
What does a concentric force cause?
A change in linear motion but no changes in angular motion
What is an eccentric force?
A force whose line of action does not pass through the CoG
What does an eccentric force cause?
Changes in both angular and linear motion
What type of data is useful for performance enhancement and injury prevention?
Kinetic (force) data
What do force plates measure?
The ground reaction forces generated when the body is in contact with the ground
What are the four properties of all forces?
- Magnitude
- Direction
- Point of Application
- Line of Action
Define external forces.
Forces that act on objects as a result of interaction with the surrounding environment
What are contact forces?
Forces that occur between objects in contact
Give an example of non-contact forces.
- Gravitational
- Magnetic
Define internal forces.
Forces that act within the object or system whose motion is being investigated
What do equal, opposite directed and parallel forces constitute?
A force couple
What is the effect of a force couple?
It tends to cause rotation only
What is the formula to calculate the horizontal velocity using cos?
cos(θ) = adj/hyp
What is the Pythagorean theorem?
a² + b² = c²
What can any vector be decomposed into?
An arbitrary set of vectors that will add up to the original vector
What is the first step when adding vectors?
Locate the starting point
What is the Triangle Rule for adding vectors?
Obtain the resultant by drawing the two vectors in head-to-tail fashion
What does the Parallelogram Law state?
The sum of two vectors is equal to the diagonal of the parallelogram formed by the two vectors
Which forces act on an athlete?
External forces
