# lec4 - L ECTURE 4: N EWTON S 1 ST AND 2 ND L AWS Newtons...

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L ECTURE 4: N EWTON S 1 ST AND 2 ND L AWS Newton’s 1st Law of Motion Mass/inertia Newton’s 2nd Law of Motion Net Force Free-body diagrams

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1. Roughly estimate the speed of a long “bomb” thrown by a quarterback in m/s. (Hint: v = Δ s / Δ t , where Δ s is the change in distance.) (a) 0.3 (b) 3 (c) 30 (d) 300 2. Roughly estimate the acceleration of the football while the quarterback is throwing it (in m/s 2 ). (Hint: a = Δ v / Δ t .) (a) 0.5 (b) 5 (c) 50
Acceleration occurs whenever speed or direction change Hay. ~ a = ~ Δ v / Δ t

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1. A golf ball rests on a tee. Its acceleration is (a) positive in the direction of the fairway (b) nearly zero (c) perpendicular to the fairway (d) negative in the direction of the fairway
2. A hockey puck slides down the ice. Its acceleration is (a) positive in the direction of motion (b) nearly zero (c) perpendicular to the direction of motion (d) negative in the direction of the motion

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(a) positive in the direction of motion
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## This note was uploaded on 12/12/2011 for the course PHYS 17 taught by Professor Mcwilliams,r during the Fall '08 term at UC Irvine.

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lec4 - L ECTURE 4: N EWTON S 1 ST AND 2 ND L AWS Newtons...

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