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 0 answersPost by Luke Limpert on October 8, 2012In extra example 2 the coefficient of static is 0.3 not 0.4. 2 answersLast reply by: Marcelo QuijanoWed Nov 19, 2014 9:04 AMPost by Tiffany Schmitcke on February 9, 2012At 18:57 he says that the angle of theda is about 52 degrees....how did he get that?

### Newton's Laws of Motion

• First law: an object continues in its state of rest or uniform motion unless an external force acts on it.
• Second law: the net force acting on an object is equal to the mass of the object times its acceleration: F = ma. The force F is in Newtons (N), the mass m is in kilograms (kg), and the acceleration is in m/s2.
• Third law, the law of action and reaction: If particle 1 exerts a force on particle 2, then particle 2 exerts an equal but opposite force on particle 1.
• The weight of an object is the force of gravity exerted on the object by the Earth. It has to be clearly distinguished from the mass.
• When an object moves on a rough surface, a frictional force always opposes the motion. If the object is stationary, a force of static friction acts on it with a magnitude that varies from zero to a maximum value.

### Newton's Laws of Motion

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• Force 0:21
• Contact Force (Push or Pull)
• Field Forces
• Gravity
• Electromagnetic Force
• Strong Force
• Weak Force
• Contact Force as Electromagnetic Force
• Focus on Contact Force and Gravitational Force
• Newton's First Law 7:37
• Statement of First Law of Motion
• Uniform Motion (Velocity is Constant)
• Inertia
• Newton's Second Law 11:19
• Force as a Vector
• Statement of Second Law of Motion
• Force (Formula)
• Example: 1 Force
• Newton (Unit of Force)
• Example: 2 Forces
• Newton's Third Law 19:38
• Action and Reaction Law
• Statement of Third Law of Motion
• Example: 2 Objects
• Example: Objects in Contact
• Example: Person on Earth
• Gravitational Force and the Weight of an Object 24:01
• Force of Attraction Formula
• Point Mass and Spherical Objects
• Example: Gravity on Earth
• Example: 1 kg on Earth
• Friction 37:09
• Normal Force
• Example: Small Force
• Force of Static Friction
• Maximum Force of Static Friction
• Values of Coefficient of Static Friction
• Coefficient of Kinetic Friction
• Force of Kinetic Friction
• Example: Horizontal Force
• Example: Angled Force
• Extra Example 1: Wire Tension
• Extra Example 2: Car Friction
• Extra Example 3: Big Block and Small Block