Physics
Chapter 4 Outline
Forces in One Dimension
Overview - This unit addresses forces, Newton's Laws of Motion, the concept of mass vs. weight, the idea that a net force causes acceleration and the fall of bodies in air.
Objective: - Name the four types of forces, and be able to apply Newton's Laws of Motion to solve problems.
Start Date: - September 12th
Due Date: - February 19th
Suggested Timeframe: - Lab should be on the 15th and 16th. Study Guides due on the 15th. Test will be on the 19th.
Assignment: - Newton's Laws of Motion
-All forces are vectors; they have both a magnitude and a direction.
-The four basic forces are the gravitational, electromagnetic, and strong and
weak nuclear forces.
-Newton's first law states that an object with no net (unbalanced) force acting
on it will either remain at rest or continue moving at a constant speed in a
straight line.
-Newton's second law states that when a net (unbalanced) force acts on an
object, the resulting acceleration varies directly with the force and inversely
with the mass of the object.
-Newton's third law states that forces always exist in pairs. When one object
exerts a force on a second object, the second object exerts an equal and
opposite force on the first.
-The weight of a body is proportional to its mass.
-Weight is the gravitational force on an object.
-Friction is a force that acts when two objects rub against each other.
- The magnitude of the sliding frictional force is the product of the
coefficient of friction and the normal force.
-Net force is the vector sum of forces acting on a body.
- A body falling in air reaches terminal velocity when the upward force of air
resistance equals the downward force of gravity.
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