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Course: AP PHYSICS 1
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AP PHYSICS 1

1. Kinematics

0/29

2. Force and Translational Dynamics

0/73

3. Work, Energy, and Power

0/31

4. Linear Momentum

0/29

5. Torque and Rotational Dynamics

0/37

6. Energy and Momentum of Rotating Systems

0/27

7. Oscillations

0/21

8. Fluids

0/30
Quiz

5.4.1 Rotational Equilibrium – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
Which pair of conditions must hold for an object in static equilibrium?
ΣF = 0 only
Στ = 0 only
ΣF = 0 and Στ = 0 and the object is at rest
Net force constant and net torque constant
2.
A 40 N force acts at 0.50 m from a pivot, perpendicular to the lever. What is its torque?
20 N m
0.0125 N m
40 N m
80 N m
3.
Why is it often helpful to choose the axis at the point where an unknown force acts?
Because torque is always zero there
Because weights then vanish
Because it removes the need for ΣF = 0
Because that force then has zero lever arm and produces no torque
4.
A 2.0 kg mass sits 0.60 m left of a pivot. What mass at 0.40 m right of the pivot balances it (ignore the beam's mass)?
2.0 kg
3.0 kg
0.80 kg
1.3 kg
5.
A force of 10 N is applied to a wrench at 0.30 m from the bolt, directed along the wrench handle toward the bolt. What is the torque about the bolt?
3.0 N m
33 N m
0 N m
1.5 N m
6.
A uniform 4.0 kg beam is balanced on a pivot at its centre. A load is added to one end. What must happen for balance to be restored?
The pivot must move toward the loaded end
The pivot must move away from the loaded end
The beam must be shortened by half
Nothing; the beam stays balanced
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Part of 5. Torque and Rotational Dynamics — see every lesson and quiz in this unit.
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