1 / 13

Newton’s first law REVIEW

Newton’s first law REVIEW. Summarize what the law states. What does an object at rest need for it to move? What is another name for N ewton’s first law of motion? What is inertia? What causes a moving object to stop moving? The (more/less) mass an object has, the harder it is to move.

ingo
Download Presentation

Newton’s first law REVIEW

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. Newton’s first law REVIEW Summarize what the law states. What does an object at rest need for it to move? What is another name for Newton’s first law of motion? What is inertia? What causes a moving object to stop moving? The (more/less) mass an object has, the harder it is to move. The (more/less) mass an object has, the harder it is to move.

  2. Newton’s Second Law

  3. NEWTON’S second law The acceleration of an object depends on the mass of the object and the amount of force applied. VOLUNTEERS!!!!! TWO “pushers” of similar size ONE small 8th grader ONE big 8th grader

  4. Part 1: Acceleration depends on mass Acceleration of an object decreases as its mass increases Acceleration of an object increases as its mass decreases Which would be easier to push? WHY?

  5. Part 2: Acceleration depends on force Acceleration of an object increases as the force on it increases Acceleration of an object decreases as the force on it decreases VOLUNTEERS!!!!! ONE to sit in chair ONE to push chair

  6. Newton’s law with MATH Formula: a = F m Force acceleration mass UNITS  accleration: m/s² (meters per second squared) force: N (Newtons) mass: kg (kilograms)

  7. Tricky…tricky…. • You don’t use newtons to find acceleration in this formula 1 N = 1 kg∙m/s² So…4 N = 4 kg∙m/s² And….500 N = 500 kg∙m/s² And 395 N = ?

  8. Newton and math example Mass of apple: 0.102kg Force: 1N Acceleration? a= 1kg∙m/s²(1N)/ 0.102kg a= 9.8 m/s

  9. Practice What is the acceleration of a 3kg mass if a force of 14.4 N is used to move the mass?

  10. Practice What is the acceleration of a 7kg mass if a force of 68.6 N I used to move it toward earth?

  11. Challenge question What force is necessary to accelerate a 1,250kg car at a rate of 40 m/s² ? HINT: F = m x a

  12. Another challenging question Zookeepers carry a stretcher that holds a sleeping lion. The total mass of the lion and the stretcher is 175 kg. The lion’s forward acceleration is 2 m/s². what is the force necessary to produce this acceleration?

More Related