Physics
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The document provides an overview of physics concepts related to Earth, the universe, and motion. It discusses that Earth orbits the sun in 365 days to make a year, and its tilt causes seasons. It defines a light year as the distance light travels in one year. Regarding motion, it outlines Newton's three laws: an object's motion stays the same without forces; force equals mass times acceleration; and every action has an equal and opposite reaction. Key equations of motion are also presented.
Physics
- 1. Physics revision Made by Lydon Bugeja Year 10.2
- 3. Earth and universe ï‚› ï‚› What we know to be a star is a SUN Planet Earth turns on itself to make 24 HRS
- 4. SEASONS  The seasons occur because the earth have this thing called a tilt so when a place on earth is closer to the sun it is summer…when it is not close to the sun it is winter
- 5. Earth and sun ï‚› The earth turns around the sun in 365 days to make a year SUN
- 6. GRVITATIONAL PULL ï‚› Gravitational Pull depends on MASS & DISTANCE
- 7. MAIN POINTS ON PLANETS They do not produce their own light ï‚› Planets always orbit a sun ï‚› A planet is always almost round ï‚› Planets clear their surrounding orbit from material ï‚›
- 8. PLUTO ??? ï‚› Pluto is not a planet because it has too much material surrounding it and to be a planet it needs to not have to much material surrounding it. PLUTO
- 9. LIGHT YEARS ï‚›A light year is the DISTANCE for LIGHT to travel for 1 YEAR
- 10. light Light travels 3 x 108 in one second = 3 000 000 000 ï‚› ï‚› Therfore 1 light year = 9.4 x 1015m
- 11. On the move
- 12. AVERAGE SPEED ï‚› Total Speed division total time = Average Speed
- 13. Acceleration Change in speed in a certain time = acceleration ï‚› Difference in y/difference in x = gradient ï‚› Difference in Velocity/Difference in time =acceleration ï‚› UNITS = m/s 2 ï‚›
- 14. Area under graph=Time taken  ½ bxh
- 15. AREA UNDER VELOCITY TIME GRAPHS = DISTANCE TRAVELLED
- 16. THE 3 EQUATIONS OF MOTION ï‚› ï‚› ï‚› V= u+at v2=u2+2as s=ut+1/2at2
- 17. STOPPING DISTANCE ï‚› Stopping Distance = Braking Distance + Thinking Distance
- 18. GRAVITY REVIEW Isaac Newton discovered the acceleration due to gravity ï‚› The more the mass the more the gravity ï‚› The gravity of earth is 9.81m/s2 but we round it to 10 m/s2 ï‚›
- 19. NEWTON’S LAWS – ON THE MOVE
- 20. 1st law ï‚› If you throw something in vacuum the object will keep the same speed and the same direction
- 21. 2nd law ï‚› Force is proportional to acceleration ï‚› Therefore the more the force the more the acceleration
- 22. 3rd law ï‚› Forces interect with each other if for example you are doing a downward force on a chair the chair is doing an upward force on you