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Course: AP PHYSICS 1
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AP PHYSICS 1

1. Kinematics

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2. Force and Translational Dynamics

0/73

3. Work, Energy, and Power

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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

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Quiz

3.5.2 Instantaneous Power – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
The instantaneous power of a force F on an object with velocity v at an angle θ to the force is
F v cos θ
F v / cos θ
F v sin θ
F cos θ / v
2.
A force of 20 N acts on an object moving at 4.0 m/s in the same direction. The power is
5.0 W
24 W
80 W
16 W
3.
An object moves in a circle at constant speed. The power delivered by the centripetal force is
mv³/r
Zero
Positive and constant
Negative
4.
A car engine has constant power. As the car speeds up on a level road, the driving force
Increases
Stays constant
Is zero
Decreases
5.
The area under a graph of power (vertical) against time (horizontal) represents
Force
Energy transferred
Speed
Efficiency
6.
A 2.0 N frictional force opposes an object moving at 3.0 m/s. The power associated with friction is
+6.0 W
+1.5 W
−1.5 W
−6.0 W
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Part of 3. Work, Energy, and Power — see every lesson and quiz in this unit.
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