1 / 14

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. 6.1 Newton’s First Law 6.2 Newton’s Second Law 6.3 Newton’s Third Law and Momentum.

eyal
Download Presentation

UNIT TWO: Motion, Force, and Energy

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. UNIT TWO: Motion, Force, and Energy • Chapter 4 Motion • Chapter 5 Force • Chapter 6 Newton’s Laws of Motion • Chapter 7 Work and Energy

  2. 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

  3. 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.

  4. 6.1 Force changes motion • A force is a push or pull, or any action that is able to change motion.

  5. 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. 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?

  7. 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.

  8. 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?

  9. 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.

  10. 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

  11. 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.

More Related