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A) 2 m/s2 (−x) B) 2 m/s2 (+ˆ) C) 2 m/s2 (−y ) D) 2 m/s2 (+ˆ)
ˆ
x
ˆ
y 2. An elevator is moving upward, but slowing down, with an acceleration of a = 1 m/s2 downward. A block with mass m = 3 kg sits on
the ﬂoor of the elevator, and a triangle with mass 1 kg sits on top
of the block.
4 (a) Draw and label the forces on the triangle and the block. y v x v
1kg 3kg 1kg 3kg a = 1m/s2
2 (b) Find the normal force on the triangle due to the block. 2 (c) Find the normal force on the block due to the ﬂoor. Page 2 3. A ball is launched from the ground into the air with a
velocity of v0 = 3ˆ + 4ˆ. We will ignore air resistance.
x
y vtop?
3 (a)
A) 0 The velocity vtop of the ball at the top of its arc is
B) 3ˆ C) 4ˆ D) 3ˆ + 4ˆ
x
y
x
y y
x h v0 3 (b) How high is the ball above the ground at the top of its arc? 4. A 5 kg block moving at 5 m/s to the right collides with a
1 kg block moving at 2 m/s to the left. After the collision,
the 5 kg block is moving at 3 m/s to the right.
3 (a) What is the velocity of the 1 kg block after the collision? before
5kg 5m/s 2m/s 1kg after
5kg 3 (b) After the collision, the kinetic energy of the...
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 Spring '12
 ScottHill
 Physics, Angular Momentum, Force, Mass, Kilogram, m/s, kg block

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