1 / 17

Section 3 Motion and Forces

Section 3 Motion and Forces. Bellringer /10.3 Notes. The concept of force explains many occurrences in our everyday lives. From your own experience, state what will happen in the following situations:.

naida-koch
Download Presentation

Section 3 Motion and Forces

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. Section 3 Motion and Forces

  2. Bellringer/10.3 Notes The concept of force explains many occurrences in our everyday lives. From your own experience, state what will happen in the following situations: A marble is placed at the top of a smooth ramp. What happens to the marble? What force causes this? A marble is rolling around in the back of a small toy wagon as the wagon is pulled along the sidewalk. When the wagon is stopped suddenly by a rock under one of the wheels, the marble rolls towards the front of the wagon. Why does the marble keep going when the wagon stops? (Hint: Consider what it takes to change the velocity of the wagon and the marble.) If you dropped a flat uncrumpled sheet of notebook paper and a similar piece of notebook paper that was crushed into a ball from the same height, which would reach the floor first? Why are the forces on these two pieces of paper different?

  3. What is FORCE? Are these people exerting FORCE?

  4. Which people are exerting a balanced force? WHY? BALANCED UNBALANCED

  5. I. Unbalanced Forces Net Force – Combination of ALL forces acting on an object. Net force greater than zero equals acceleration of that object. Why is there a net force?

  6. Are there unbalanced forces in the picture below? Unbalanced forces are 2 & 4 Will he be able to move the box?

  7. II. Balanced Forces The men are the same size and have the same strength. What will happen?

  8. Balanced forces DO NOT change motion Man’s mass pushing down Force (Earth) pushing up on the man

  9. Are there balanced forces in the picture below? Balanced forces are 1 & 3

  10. III. Friction Friction is an unbalancedforce Friction is caused by tiny bumps and ridges on a surface bumping into the tiny bumps and ridges on another surface.

  11. What FORCE helps these cars going around the corner? The force of friction is greater than the force of the car’s motion.

  12. What FORCE prevents this car from rolling down the hill? Friction opposes the force of gravity

  13. Why do they “sweep” the ice in front of the stone?

  14. IV. Static & Kinetic Friction Static Friction – two objects not moving. Takes a greater force to oppose static friction. B. Kinetic Friction – friction between moving surfaces. Takes less force than static friction.

  15. 2. Two kinds of kinetic friction: Sliding friction b. Rolling friction

  16. 3. Air resistance – friction between an object and the air passing over it. When the force of gravity = the force of air, no acceleration takes place.

  17. 4. Air resistance increases as speed increases. a. More air per second must pass by due to the increase of speed. b. Size & shape also affects air resistance.

More Related