1 / 15

Newton’s Second Law of Motion

Newton’s Second Law of Motion. Newton’s Second Law – the Law of Acceleration. The acceleration (a) of an object depends on the objects mass (m) and the amount of force (F) applied to the object. Remember, acceleration occurs when an object…. 2. Slows Down. 1. Speeds up.

alea-avila
Download Presentation

Newton’s Second Law of 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. Newton’s Second Law of Motion

  2. Newton’s Second Law – the Law of Acceleration • The acceleration (a) of an object depends on the objects mass (m) and the amount of force (F) applied to the object.

  3. Remember, acceleration occurs when an object… 2. Slows Down 1. Speeds up 3. Changes Direction

  4. What does this look like? Force mass acceleration X Most familiar version: F = m•a Actual definition of Newton’s 2nd Law: a = F/m Other Manipulation: m = F/a

  5. A = F/m Practice! F = m X A • What is the acceleration of a 15 kg mass if a force of 45 Newton’s is used to move it? - Which formula will you use? A = F/m A = 45 N / 15 kg A = 3 m/s2

  6. With a partner! A = F / m F = m X A What force is necessary to accelerate 200 kg object at a rate of 40 m/s2?

  7. On your own… A = F / m F = m X A What is the force necessary to move an object with a mass of 25 kg at an acceleration of 5 m/s2?

  8. Net Forces • Total of forces acting on an object • the refrigerator has many forces acting on it, but when added together they cancel out. • therefore there is no change in it’s motion

  9. Forces in the Same Direction • In this example, there are two forces acting on the object in the same direction. • These two forces are added together. • The objects resulting motion is to the right. 15 N 20 N 35 N Resulting Net Force=

  10. Net Force of Zero • Because the forces from Man A and Man B are equal but opposite in direction, there is no change in the objects motion. B A

  11. Net Force Other Than Zero • If there is a difference between two opposing forces, the resulting change in motion is in the direction of the larger force. • The force of the car is 10 N to the right while the parachute provides 7 N of force in the opposite direction. • Net Force = 10 N – 7 N • F = 3 N to the right

  12. Practice • What would the resulting motion be from this group of forces?

  13. More Practice • The mass of the car and the driver equals 240 kg. How fast will the driver and his car accelerate?

  14. ? 7 N 3 N 15 N 10 N 85 kg 50 kg 75 kg 90 kg 55 kg • How much force would the man on the left need to provide in order to stay in the same position? • If the man on the right was able to provide 30 N of force, what would the resulting acceleration be?

  15. Always remember… If Force remains the same and • mass increases, then acceleration will decrease. • Acceleration increases, then the mass will have to decrease. 2nd Law Video Newton’s 2nd Law and trains

More Related