How do objects move17 18
- 1. How do objects move?
- 2. - It is the change in the position (Location) Motion
- 3. Types of motion Up and down motion Ex. See saw Straight line motion Round and round motion Ex. Merry go round Zigzag motion Back and forth motion Ex. Swing
- 4. How can we measure motion? - Motion can be fast or low. Distance -It is how far an object is from one position to another. - Measured by: Ruler & Measuring tape - Units: Cm, meters & kilometers.
- 5. Time - Units: seconds, minutes , hours, days, years. Speed -It is the distance an object moves in a certain time. Speed = Distance/Time
- 6. Things that affect motion of an object 1- The strength of the force: Toss ball gently it will be near Toss ball hard it will be far
- 7. Any type of push & pull Force
- 8. - Pushing the table to the right. - Pulling the drawer out. - Pushing the stroller to the left. 2- The direction of the force:
- 9. - It is the amount of material in an object. Small mass is easy to move Big mass is harder to move {It is easier to push an empty shopping cart than to push a full one} 3- The mass of the object:
- 10. - It is the kind of force that stops or slows things down. {It prevents us from slipping or falling down} - It is caused when two objects rub together. Friction
- 11. • Friction always works in the direction opposite from the direction the object is moving, or trying to move. It always slows a moving object down. Moving Friction Friction
- 12. Examples 1) Friction between the tires of a car & the road. 2) Friction between the bottom of your sneakers & the ground.
- 13. 3) Friction between the brakes of the bicycle & the bicycle wheels. 4) Friction between the train Wheels & rails
- 14. • The amount of friction depends on the materials from which the two surfaces are made. The rougher the surface, the more friction is produced. For example, you would have to push a book harder to get it moving on a carpet than you would on a wooden floor. This is because there is more friction between the carpet and the book than there is between the wood and the book. Friction
- 16. Increasing / Decreasing friction • Ice & water make surfaces slippery, this decrease the friction. {This why skaters can slide easily & smoothly}
- 17. • Tires of cars have rough surfaces to increase the friction between the road & the car preventing cars from slipping on an inclined plane.
- 18. • Lubricating “putting oil” to bicycles decrease friction & makes bicycles move faster. • Lubricating doors decrease friction making doors easy to open & close