Download Newton`s Laws of Motion 1) An object with no net force acting on it

Newton’s Laws of Motion
1) An object with no net force acting on it will move with a constant
velocity.(including v=0)
2)
3) For every force acting on an object, there is an equal but opposite
force acting from the object.
Find the action–reaction pairs:
Free Body diagrams and Newton’s 2nd Law
What are the common forces acting on moving objects?
Common Free Body Diagrams
Using Newtons’s 2nd Law
Eg1) A 45 kg crate is pulled by 2 men across a smooth floor as shown.
a)Find the acceleration of the crate.
b) How long would it take to move the crate 25m?
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eg2) If the acceleration is 1.3𝑠2 , find µ, the coefficient of friction.
Eg3) What is the maximum rate of acceleration for a 75 kg person
climbing a rope that has a max tension of 1000N?
Eg4) An 85kg rider in an elevator notices that the bathroom scale he
stands on reads 675 N. Determine the motion of the elevator.
Eg5) What force does the 10kg mass apply to the 20 kg mass if they
are being pushed by a 50N applied force?
Eg6) for the picture shown, determine the tension in the rope
connecting the masses if m = 10kg and M = 20kg.