Exam 1: Chaper 1 Flashcards
What is biomechanics?
The study of forces and their effects on living things.
What is mechanics and what type will we be talking most about?
Mechanics is the analysis of forces and their effects. We will be talking about rigid body mechanics.
What are the four types of subcategories for rigid body mechanics?
Statics
Dynamics
Kinematics
Kinetics
What is static rigid body mechanics?
Statics is constant motion.
What is dynamic rigid body mechanics?
Dynamics are accelerated bodies.
What is kinematics?
The description of motion
What is kinetics?
The forces that cause the motion.
What is mass?
The amount of matter within an object.
What is weight?
The force of gravity acting on the mass of an object.
What is inertia?
The amount of movement an object possesses
What are forces?
It can be defined as a push or a pull.
In what units can force be described in and what is a quantitative description of force?
It can be described in Newtons, which is the force needed to accelerate 1kg at a rate of 1m/s2.
What two ways can forces be classified?
Internal Forces and External Forces
What are internal forces?
Forces acting within a body or system
What are external forces?
Forces that act on a body as a result of interaction with the environment.
What are the two subcategories within internal forces?
Tensile forces and compression forces
What are two very important external forces?
Normal force and friction force.
Describe normal force.
It acts perpendicular to the surface and is caused by the mass being accelerated by gravity.
Describe friction force.
It acts parallel to the surface and is proportional to the normal force.
Describe the relationship between friction and surface area.
Friction is NOT affected by the size of the surface area. What does affect friction is the weight or the material that are in contact.
What are colinear forces?
When forces act along the same line and in the same direction. They can be added using regular algebraic addition.
What are concurrent forces?
When forces act in different directions, but through the same point.
What is a vector resolution?
An operation that replaces a single vector with two perpendicular vectors such that the vector composition of the two perpendicular vectors yields the original vector. (creating the X and Y axises).
What is a vector composition?
The process of determining a single vector from two or more vectors by vector addition.
What is a resultant vector?
A single vector that results from vector composition.
