1 / 11

Intro to Forces and Motion

Intro to Forces and Motion. Ms. Graettinger Physical Science. What is a force?. Force is a push or pull on an object or by an object Force= mass x acceleration F=ma A force is that which changes or tends to change the state of rest or motion of a body. Newton’s 3 Laws.

tass
Download Presentation

Intro to Forces and Motion

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. Intro to Forces and Motion Ms. Graettinger Physical Science

  2. What is a force? • Force is a push or pull on an object or by an object • Force= mass x acceleration • F=ma • A force is that which changes or tends to change the state of rest or motion of a body.

  3. Newton’s 3 Laws • 1st : An object in motion stays in motion. An object at rest stays at rest--until an outside force acts upon it • 2nd : F=ma • 3rd : For every action, there is an equal and opposite reaction

  4. The Force Equation • F = ma • Force = mass x acceleration • Mass is in kg • Acceleration is in m/s2 • Force is in Newtons (N)

  5. Force Equation Example • How much force is needed to accelerate a 70-kg rider and her 200-kg motorcycle at 4 m/s2? • F=ma • F=(70kg + 200kg) x (4 m/s2) • F=1080 N

  6. Falling Objects • Any two objects falling from the same distance, released at the same time, will land at the same time • Why is this?

  7. Acceleration due to Gravity • Falling objects accelerate at 9.8m/s2 • Therefore, • Weight=m x a • W=m x 9.8m/s2

  8. Air Resistance • The force air exerts on a moving object • If there is no force except for gravity, all objects will accelerate at a rate of 9.8 m/s2

  9. Air Resistance • This force acts in the opposite direction to that of the objects motion • Air resistance pushes up while gravity pulls down

  10. Air Resistance Example

  11. Classwork:Everyone must calculate how much they really weigh in Newtons.Conversion factor: 1kg=2.2 lb

More Related