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- 1. OBJECTS IN MOTION. 04. Newton’s Laws of Motion. Ian Anderson Saint Ignatius College Geelong
- 2. NEWTON’S FIRST LAW OF MOTION. Why is the bowl of fruit stationary on the table? Why doesn’t it slide off or float away? Source: http://absorbant.rssing.com/chan- 1377193/all_p47.html
- 3. NEWTON’S FIRST LAW OF MOTION. Why do we wear seatbelts when travelling in a car? What would happen if we didn’t and the car braked suddenly? Source: https://www.boundless.com/physics/the-laws-of- motion/newton-s-laws/
- 4. NEWTON’S FIRST LAW OF MOTION. “Every body continues in its state of rest or of uniform motion in a straight line unless it is compelled to change this state by forces acting on it.” Or in plain speak … An object will keep doing what its already doing until a force acts on it. “The Law of Inertia”.
- 5. NEWTON’S FIRST LAW OF MOTION. Do you remember what a force is? Source: http://www.fdwallpapers.com/desktop.php?pid=1650
- 6. NEWTON’S FIRST LAW OF MOTION. A force is any push, pull or twist that causes an object to do any of the following: increase its speed (accelerate). decrease its speed (decelerate). change its direction. change its shape. Force is measured in Newtons (N). Source: http://en.wikipedia.org/wiki/Isaac_Newton
- 7. NEWTON’S FIRST LAW OF MOTION. Why is the bowl of fruit stationary on the table? Answer = Because all the forces are balanced i.e. the net force = 0. For the bowl to slide off the table we would need to push it (i.e. apply a force). Source: http://absorbant.rssing.com/chan- 1377193/all_p47.html
- 8. NEWTON’S FIRST LAW OF MOTION. Why do we wear seatbelts when travelling in a car? Source: https://www.boundless.com/physics/the-laws-of- motion/newton-s-laws/
- 9. NEWTON’S FIRST LAW OF MOTION. Why do we wear seatbelts when travelling in a car? Answer = If the car was to break suddenly, we would continue moving forward unless restrained by a seatbelt. Source: https://www.boundless.com/physics/the-laws-of- motion/newton-s-laws/
- 10. NEWTON’S SECOND LAW OF MOTION. “The acceleration of an object is directly proportional to the net force applied and inversely proportional to its mass.” Or in plain speak … The acceleration of an object will be greater, the lighter the object and the larger the net force acting on it. Source: http://tdion.edublogs.org/2009/12/15/newtons-laws/
- 11. NEWTON’S SECOND LAW OF MOTION. 𝐴𝑐𝑐𝑒𝑙𝑒𝑟𝑎𝑡𝑖𝑜𝑛 = 𝐹𝑜𝑟𝑐𝑒 𝑚𝑎𝑠𝑠 Which can be written as, 𝐹𝑜𝑟𝑐𝑒 = 𝑚𝑎𝑠𝑠 × 𝑎𝑐𝑐𝑒𝑙𝑒𝑟𝑎𝑡𝑖𝑜𝑛 𝐹𝑛𝑒𝑡 = 𝑚 × 𝑎 Source: Rickard et al. (2006)
- 12. MASS V WEIGHT. Is there a difference between mass and weight? Weight is the force of gravity acting on an object. 𝑊𝑒𝑖𝑔ℎ𝑡 = 𝑚𝑎𝑠𝑠 × 𝑔𝑟𝑎𝑣𝑖𝑡𝑦 𝑤 = 𝑚 × 𝑔 Where 𝑔 = 9.8 m/s2 (on earth).
- 13. MASS V WEIGHT. If Elvis’ mass is 100kg, what is his weight on Earth and on the moon? Earth gravity = 9.8 m/s2 & Moon gravity = 1.6 m/s2 𝑤 = 𝑚 × 𝑔 On Earth 𝑤 = 100 𝑥 9.8 = 980 N. On the moon 𝑤 = 100 𝑥 1.6 = 160 N. Source: http://howthingsfly.si.edu/media/moon-scale
- 14. NEWTON’S THIRD LAW OF MOTION. “For every action (applied force) there will be a reaction (response force) that will be the same size as the action force and in the opposite direction to the action force.” Or in plain speak … If you push on something it will push back on you. For every action there is an equal and opposite reaction. Source: Rickard et al. (2006)
- 15. BIBLIOGRAPHY. Rickard, G., Phillips, G., Ellis, J., Jeffery, F., & Roberson, P. (2006). Science Dimensions 4: Coursebook. Melbourne: Pearson Education Australia.
- 16. http://SICkScience10.wikispaces.com/

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