chapter 4

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Astronomy & Astrophysics
Clifford Orwin

chapter 4 Newtons 1st law---An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force. eg. a bike laying on the ground at stays like that unless an unbalanced force acts on it ( a person lifting the bike up) and a rolling bike will keep rolling and it will only stop unless an unbalanced force acts on it. The combined friction from ground and air will cause it to slow down. WITHOUT friction the bike would keep on going forever. 2nd law---The acceleration of an object depends on the mass of the object and the amount of force applied. acceleration=forcemass ( the larger the force, the larger the acceleration) eg. a person pushing a bike with little force with just get the bike rolling a person pushing a bike with maximum force with make the bike accelerate BUT MASS ALSO PLAYS A ROLE a person pushing a bike with a child riding=bike will move faster a p
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