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UNIT TWO: Motion, Force, and Energy - PowerPoint PPT Presentation


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UNIT TWO: Motion, Force, and Energy. Chapter 4 Motion Chapter 5 Force Chapter 6 Newton’s Laws of Motion Chapter 7 Work and Energy. Chapter Six: Newton’s Laws of Motion. 6.1 Newton’s First Law 6.2 Newton’s Second Law 6.3 Newton’s Third Law and Momentum.

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Presentation Transcript
unit two motion force and energy
UNIT TWO: Motion, Force, and Energy
  • Chapter 4 Motion
  • Chapter 5 Force
  • Chapter 6 Newton’s Laws of Motion
  • Chapter 7 Work and Energy
chapter six newton s laws of motion
Chapter Six: Newton’s Laws of Motion
  • 6.1 Newton’s First Law
  • 6.2 Newton’s Second Law
  • 6.3 Newton’s Third Law and Momentum
chapter 6 1 learning goals
Chapter 6.1 Learning Goals
  • Describe how forces cause changes in motion.
  • Demonstrate and describe Newton’s first law.
  • Explain the meaning of net force.
6 1 force changes motion
6.1 Force changes motion
  • A force is a push or pull, or any action that is able to change motion.
6 1 law of inertia
6.1 Law of inertia
  • Newton’s first law says that objects continue the motion they already have unless they are acted on by a net force.
  • If the net force is zero, an object at rest will stay at rest.
  • If an object is acted upon by unbalanced forces, its motion will change.
6 1 net force
Newton’s first law is often written in terms of the net force:

“An object at rest will stay at rest and an object in motion will continue in motion at constant velocity UNLESS there is a net force.”

6.1 Net force

According to these vectors, in what direction is the net force?

6 1 force changes motion1
6.1 Force changes motion
  • Forces can be used to increase or decrease the speed of an object, or to change the direction an object is moving.
6 1 law of inertia1
6.1 Law of inertia
  • Inertia is the property of an object that resists changes in motion.
  • Objects with more mass have more inertia and are more resistant to changes in their motion.

Which ball has more inertia?

solving problems
Solving Problems

A car drives along the highway at constant velocity. Find the car’s weight and the friction force if the engine produces a force of 2,000 newtons between the tires and the road and the normal force on the car is 12,000 N.

solving problems1
Solving Problems
  • Looking for:
    • …weight of car in newtons, force due to friction
  • Given:
    • …ForceN = 12,000N (up);
    • …ForceE = 2,000N (forward)
  • Relationships:
    • Newton’s 1st Law:
      • net force = zero at constant velocity; so ForceN = ForceW and ForceE = ForceF
solving problems2

FW = -12,000N

FF = -200 N

FE = 200 N

FN = 12,000N

Solving Problems
  • Solution
    • Draw a free body diagram.
    • There is no net force upward, so the weight of the car is an equal downward force of −12,000 N.
    • The forward engine force balances the friction force so the friction force is −2,000 N.