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od943
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Homework Statement
PART A: A force ~F = Fx ˆı+Fy ˆ acts on a particle that
undergoes a displacement of ~s = sx ˆı + sy ˆ
where Fx = 6 N, Fy = −3 N, sx = 5 m, and
sy = 1 m.
Find the work done by the force on the
particle.
Answer in units of J.
PART B: Find the angle between ~F and ~s.
Answer in units of ◦.
PART C: An easy question but still need help:
Which of the following does not involve work?
1. A golf ball is struck.
2. A weight lifter does military presses (lift-
ing weights over his head.)
3. A professor picks up a piece of chalk from
the floor.
4. A runner stretches by pushing against a
wall.
5. A child is pushed on a swing.
Homework Equations
a^2+b^2=c^2
F=ma
W=fcosthetad