Chapter 4: Forces and the Laws of Motion.  Misconception: an object with no force will be at rest.  Inertia – the tendency of an object to maintain.

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Presentation transcript:

Chapter 4: Forces and the Laws of Motion

 Misconception: an object with no force will be at rest.  Inertia – the tendency of an object to maintain its state of motion, or tendency not to accelerate.

 Acceleration is determined by net external force.  Net external force – to total force from a combination of external forces on an object; sometimes called the resultant force.  Vector sum of all forces acting on an object.

 Mass is a measurement of inertia.  Inertia is proportional to mass.

 Objects in motion tend to stay in motion.

 Equilibrium – the state in which there is no change in a body’s motion.  Occurs when there is no net force on the object. ▪ When the vector sum of all forces acting on an object is equal to zero.