sasathorn

__**Its all relative**__ 1) t=d/s =360/28-10 =>360/18 =20secs

1) V=C-D =60-100 =-40 =40 kmh-1 west
 * __Relative motion__**

2) D=2S =2x27.78 ms-1 =55.56 m

3) V=S-N =25-30.5 =-5.5 kmh-1 =5.5 kmh-1 south

4) V=N-S =5-12 =-7 ms-1 =7 ms-1 south

5) t=d/s =0.5/100 =0.005 secs =No, you cannot over take the slower car safely because the time taken for the car travelling at 100 km/h to reach you is 0.005s but it took you 10s to overtake the slower car.

__**Newton's contribution to physics**__ - Law of Motions - Universal Gravitation - Classical Mechanics - Natural Laws - Reflecting Telescope - Visible Spectrum

__**Newtion's Universal Law of Gravitation**__ Fg = G*m(1)*m(2) / r2 universal gravitation = gravitational mass og each object divided by square of the distance between the teo objects

The gravitational force is proportional to the product of their masses. As the mass increases the gravitational increases. As the mass decreases the gravitational decreases.

The gravitational forece is inversely proportional to the square of the distance. As the distance increases the gravitational decreases, and vice-versa. As the distance decreases the gravitational increases, and vice-versa.

'Newton’s Law of Universal Gravitation grew in importance as scientists realized its utility in predicting the orbits of the planets and other bodies in space.' http://www.visionlearning.com/library/module_viewer.php?mid=118