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# Units 3.8-3.18

Slipping when a spinning object makes contact with another surface, yet continues to spin, all the while remaining in place.
Rolling when a rotating object in contact with a surface moves along that surface in a straight line.
Angular acceleration when a spinning object undergoes a change in RPM or angular velocity
Newton’s 1st Law of Motion object at rest will remain at rest unless acted upon by a force external to the object, and conversely, an object in motion will remain in motion unless also acted upon by an outside force.
Inertia The resistance of an object to changes in position or velocity.
Newton’s 2nd Law of Motion the acceleration of an object is directly proportional to the net or total force acting on the object and inversely proportional to the object’s mass.
Mass A measure of the amount of matter an object possesses.
Newton’s 3rd Law of Motion all forces exist in pairs and these two forces must be equal but opposite in direction.
Center of gravity an imaginary point where the weight of the object can be thought of as being concentrated.
Friction the force that opposes an object’s motion.
Force Anything that causes the motion of a physical system to change.
Static friction the force that prevents an object from moving in response to a push or a pull.
Kinetic friction The frictional force between two objects which are in relative motion and in contact with each other.
Traction Kinetic friction between a drive member and the driving surface.
Torque A force applied at a distance from an axis of rotation.
Stall torque A torque value large enough to cause a motor to stop running.
Joule The unit for work.
Deadband area where rotational speed is zero.
Created by: BHS Engineering

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