Lesson 5
One that maintains a constant shape
Rigid Body
A resistance to change in motion, specifically, a resistance to a change in a body’s velocity
Inertia
The sum of all forces acting on the body
Net force
A variable resistive force. As material stiffness and stretch increase so does resistance
Elastic Resistance
The turning effect of a force
Torque
A fixed line about which a body rotates
Axis of Rotation
A resistance to a change in the velocity of a moving body
momentum
For every force created on a body, there is a force of equal magnitude and opposite direction
Reaction force
A resistive force that increases when more force is applied to it.
Accommodating resistance
The length of the lever from the center of rotation to the point of application of the force
Lever Arm
How fast a body is rotating
Angular Speed
A point where all the mass is considered to be concentrated
Center of mass (COM)
A force which opposes motion between two surfaces that are in contact with one another.
Friction
Perpendicular distance from the axis of rotation to the point of force application
Moment Arm
The change in orientation of a rigid body in reference to an axis
Angular Displacement
How fast a body is rotating in a direction
Angular Velocity
The angular equivalent of mass; gives an indication of how difficult it will be to rotate an object
Moment of inertia
The product of the average force and time that force is applied, equal to the change in momentum
Impulse
On a rotating body, it is a linear acceleration that points toward the axis of rotation
Centripetal acceleration
On a rotating body, it is a linear acceleration that is perpendicular to the rigid body
Tangential acceleration
An object at rest stays at rest and an object in motion stays in motion at a constant speed is described by this Newtons Law
Law of Inertia
Describe the difference between Body Balance and Body Stability
Balance is control of equilibrium and Stability is responding to external forces that disrupt equilibrium
For every force there is an equal and opposite reaction force is described by which Newtons Law
Law of Reaction
By increasing the radius of a point on an object rotating on a solid segment, regardless of angular velocity, how with the points linear motion change?
Increase in distance covered, increase in linear velocity
A force must be applied to a body to accelerate it is described by which of Newtons laws?
Law of Acceleration