Tuesday, Oct 26, 2010

Went around the room and asked what the students told their parents about yesterday's class.

Handed back RA 4.1 and went over it.
Newton's First Law - An object at rest will remain at rest and a moving object will continue moving in a straight line with constant speed unless acted on by an outside net force.

Showed the students that a mass of 1 kg weighs 10 N on Earth.
Mass is NOT the same as weight.
Weight = mass * acceleration of gravity = mg = gravitational force of Earth on object
Weight is a force measured in Newtons.

Normal force = force perpendicular to the surface = FN or N

Introduced free-body diagrams - a picture that shows ONLY the forces that act ON an object. Went over Free-Body Diagram worksheet.

Tomorrow we will do the Statics Lab.