1 / 13

Newton’s Second Law of Motion

Newton’s Second Law of Motion. Force and Acceleration. Force is a push or a pull acting on an object. Acceleration occurs when the VELOCITY of an object changes. Examples: Speed up Slow down Changes direction. Mass is the amount of matter in an object. Force and Acceleration.

lok
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. Force and Acceleration • Force is a push or a pull acting on an object. • Acceleration occurs when the VELOCITY of an object changes. Examples: Speed up Slow down Changes direction • Mass is the amount of matter in an object.

  3. Force and Acceleration • Units of Force = Newtons (N) SI units for mass is kg SI units for acceleration is m/s2 1 Newton (N) = 1kg * m/s2

  4. Force and Acceleration • In this equation, a is the acceleration, m is the mass, and Fnet is the net (total) of all forces.

  5. Formula Practice A book with a mass of 2.0kg is pushed along a table. If the net force on the book is 1.0N, what is the book’s acceleration? Answer: .5m/s2

  6. Gravity & Weight • Gravity is the force of attraction that exists between any two objects that have mass. • The force of gravity depends on the mass of the objects and the distance between them.

  7. Gravity & Weight • Weight is a force, like the push of your hand is a force, and is measured in Newtons (N). • The force of gravity causes all objects near Earth’s surface to fall with an acceleration of 9.81 m/s². • Your weight on Earth is the gravitational force between you and Earth. • W= mg: w = weight, m = mass, g =gravity

  8. Gravity and Weight • How are weight and mass different? • Mass is the amount of matter in an object and Weight is the force of gravity acting on a Mass • Weight will vary with location, but mass will remain constant. • What does this mean?

  9. Newton’s 2nd Law • Newton’s Second Law states: an object acted upon by an unbalanced force will accelerate in the direction of the force. • If you kick the ball, it starts moving. • The ball accelerates only while your foot is in contact with the ball.

  10. Newton’s 2nd Law • Newton’s second law of motion can be used to calculate acceleration. • For example, suppose you pull a 10-kg sled so that the net force on the sled is 5 N. • The acceleration can be found as follows:

  11. Section Check Question 2 Your _______ on Earth is the gravitational force between you and Earth. A. acceleration B. inertia C. mass D. weight

  12. Forces and Direction • Fn: normal force - is applied perpendicular to the plane and stops an object from falling. • Fg: gravity – is applied down toward the center of the Earth • Ft: tension – occurs when an object is suspended from a rope or cable • Fsp: spring – occurs when an object is suspended from a spring and the spring is stretched or compressed. (pull vs push)

  13. Forces (Frictional) • Fs: static friction – occurs between 2 objects that stops 1 object from sliding. Opposes the direction of the slide and is parallel • Fk: kinetic friction – occurs between 2 objects that are sliding past each other (must be touching) • Far: air resistance occurs against a falling object. It’s direction is opposite the fall.

More Related