Pre-AP Physics Rotational Motion Test Review

```Name: _____________________________
Period: _____
Pre-AP Physics Rotational Motion Test Review
study your notes and homework for this unit.
1. Fill out the chart with the correct rotational version with right units
Quantity
Linear
Rotational
Displacement
x or s (m)
Inertia
Mass (kg)
F = ma
Force
F
(N)
K = &frac12;mv2
Velocity
v
( m/s )
Work = Fx
Acceleration
a
( m/s2 )
Power = Fv
Momentum
mv (kg m/s)
Linear Motion
Rotational
Motion
Fx = ΔK
2. For a rolling object to not slip what must be true of their linear and rotational velocities.
3. A hoop of 3 m radius rolls without slipping on a flat surface. The center of the wheel
advances at constant velocity, moving a distance of 15 m in 3 s. What is angular speed
of the wheel?
4. A bicyclist starts from rest and accelerates at 2 rad/sec2. In 10 seconds what is the
angular displacement of the bike wheels?
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Pre-AP Physics angular Motion Test Review
5. A bike wheel with mass 1.5 kg and 63 cm radius accelerates uniformly from rest to a
speed of 15 rad/s in 5s. Determine the net torque acting on the bike wheel.
6. What is the net torque?
7. For an object to be in equilibrium what two conditions need to be met?
8. John wants to move a 400 N rock with 69 cm crowbar. He puts the fulcrum 9 cm from
the rock. How much force must he use to move the rock?
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Pre-AP Physics angular Motion Test Review
9. A 759 N window washer is standing on a scaffold supported by a vertical rope at each
end. The scaffold weighs 254 N and is 3.50 m long. Assume the window washer stands
1.3 m from
the left end.
a. What is the tension in the rope on the right (hint: make the left rope the pivot
point for torque)?
b. What is the tension in the rope on the left?
10. A 2.5 kg solid disk of radius .5m and rotational inertia of .3125 kg m2 rolls down the hill. It
has initial velocity equal to zero and the hill is 18.3 m high. What is the velocity v of the
disk at the bottom of the hill? Ignore friction.
11. A diver can reduce her rotational inertia when changing from the straight position to the
tuck positions. Her inertia when in the straight position is 9 kg m2 and 3 kg m2 when in
the tucked. She rotates at 2.3 rad/s when in the straight position.
a. What is her angular speed (rad/s) when in the tucked position?
b. What is the kinetic energy of the diver in both positions?
c. How much work did the diver have to do to change positions?
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