Simple applications Of 1st & 2nd Laws.

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Presentation transcript:

Simple applications Of 1st & 2nd Laws

Applications of Newton’s Laws vo= 20 m/s m = 5 kg v = 0 F m d Find distance block moves LIST! Vo V a d t

Determine the magnitude of the forces acting on each of the 2 kg masses at rest below. 30° 30° 30° 60°

∑Fx = 0 and ∑Fy = 0 mg = 20 N N = 20 N

∑Fx = 0 and ∑Fy = 0 T1 = 10 N 20 N T2 = 10 N

30° mg = 20 N T1 = 20 N T2 = 20 N Method 1: ∑Fx = 0 and ∑Fy = 0

Method 1: ∑Fx = 0 and ∑Fy = 0 Method 2: ∑F = 0 30° T1 = 40 N T2 = 35 N

A Harder Problem! a. Which string has the greater tension? b. What is the tension in each string? 30° 60° Method 1: ∑Fx = 0 and ∑Fy = 0 Method 2: ∑F = 0

Applications of Newton’s Laws Find Tensions T1 and T2 q T1 sin(60) T1 cos(60) T1 T2 mg m q = 60o m = 20 kg

Applications of Newton’s Laws Another method q T1 q mg T1 T2 T2 mg m

Applications of Newton’s Laws Three mass system - find acceleration F m 2m 3m Find the tensions in the string. First find the acceleration of the system. Laws of Motion (Chapter 4) 2053.ppt

T2 F m 2m 3m Three mass system - find T2 Laws of Motion (Chapter 4) 2053.ppt

T1 T2 F m 2m 3m Three mass system - find T1 Laws of Motion (Chapter 4) 2053.ppt

Three mass system - find T1

Harder applications Of 1st, 2nd & 3rd laws

If Hand force is 150N Find the acceleration of the system With what force does the 5kg block push on the 10 kg block?