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# Download Q1: Accleration is always in the direction: A. of the

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Phys101 Term: 123 Online HW-Ch05-Lec01 Q1: Accleration is always in the direction: A. of the displacement B. of the initial velocity C. of the final velocity D. of the net force E. opposite to the final velocity Ans: Q2: �⃗net = ma�⃗ D; F �⃗ = 20𝚤̂ + 30𝚥̂ 𝑁. The only force acting on a 5.0 kg object is F magnitude of the acceleration of the object. Find the Ans: a�⃗ = 1 1 �F⃗ = (20 ı̂ + 30 ȷ̂) = (4 ı̂ + 6 ȷ̂)m/s2 m 5 |a| = 7.2 m/s 2 Q3: Ans: While two forces act on it, a particle is to move at the constant velocity �⃗ = (3ı̂ − 4ȷ̂)m/s One of the forces F = (2 ı̂ − 6 ȷ̂) N. What is the magnitude of the v other force? �⃗2 �⃗ = constant ⇒ a�⃗ = 0 ⟹ �F⃗1 + �F⃗2 = 0 ⟹ �F⃗1 = −F v �⃗1 � = �F �⃗2 � ⟹ |F2 | = �22 +62 = 6.3 N ⟹ �F KFUPM-Physics Department 1