AP Physics 1 Flashcards: Power

What this deck covers

This deck focuses on Power, giving you a quick way to review the definitions, rules, and examples that matter most for AP Physics 1.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: Which physical quantity is the rate of doing work?

Answer: Power. Power measures how quickly work is performed.

Flashcard 2: Calculate the power of a machine that does 200 J of work in 10 seconds.

Answer: 20 W. Use $P = \frac{W}{t} = \frac{200}{10}$.

Flashcard 3: Which physical quantity is the rate of doing work?

Answer: Power. Power measures how quickly work is performed.

Flashcard 4: Determine the power if a light bulb uses 60 J of energy in 1 second.

Answer: 60 W. Energy consumption rate equals 60 joules per second.

Flashcard 5: Identify the unit equivalent to one watt in terms of basic SI units.

Answer: 1 W = 1 J/s. One watt equals one joule of energy per second.

Flashcard 6: State the formula for power in terms of energy and time.

Answer: $P = \frac{E}{t}$. Energy transferred per unit time defines power.

Flashcard 7: What is the formula for mechanical power in terms of work and time?

Answer: $P = \frac{W}{t}$. Work per unit time defines mechanical power.

Flashcard 8: Calculate the power if a machine does 800 J of work in 4 seconds.

Answer: 200 W. Use $P = \frac{W}{t} = \frac{800}{4}$.

Flashcard 9: State the unit of power in the International System of Units (SI).

Answer: Watt (W). Named after James Watt, equal to one joule per second.

Flashcard 10: Identify the formula for power in rotational motion.

Answer: $P = \tau \times \frac{d\theta}{dt}$. Torque times instantaneous angular velocity.

Flashcard 11: Determine the power if a device uses 150 J of energy in 3 seconds.

Answer: 50 W. Apply $P = \frac{E}{t} = \frac{150}{3}$.

Flashcard 12: Calculate the power of a machine that does 200 J of work in 10 seconds.

Answer: 20 W. Use $P = \frac{W}{t} = \frac{200}{10}$.

Flashcard 13: What is the equivalent of 1 horsepower in watts?

Answer: 746 W. Historical unit conversion for mechanical power.

Flashcard 14: What is the formula for power in terms of force and velocity?

Answer: $P = F \times v$. Force dot product with velocity gives instantaneous power.

Flashcard 15: Identify the power output for a motor that does 4000 J of work in 20 seconds.

Answer: 200 W. Apply $P = \frac{W}{t} = \frac{4000}{20}$.

Flashcard 16: What is the formula for instantaneous power using force and velocity vectors?

Answer: $P = \textbf{F} \bullet \textbf{v}$. Dot product accounts for force direction relative to velocity.

Flashcard 17: Calculate the power if energy of 240 J is used in 4 seconds.

Answer: 60 W. Apply $P = \frac{E}{t} = \frac{240}{4}$.

Flashcard 18: What is the formula for power in terms of mass, gravity, height, and time?

Answer: $P = \frac{mgh}{t}$. Power to lift mass against gravity over time.

Flashcard 19: Calculate the power if the force is 10 N and the velocity is 5 m/s.

Answer: 50 W. Apply $P = F \times v = 10 \times 5$.

Flashcard 20: What is the formula for power using force, displacement, and time?

Answer: $P = \frac{F \times d}{t}$. Force times displacement per unit time equals power.

Flashcard 21: Identify the power if 1 kWh of energy is consumed in 1 hour.

Answer: 1000 W. One kilowatt-hour consumed in one hour.

Flashcard 22: Identify the power if 500 J of work is done in 5 seconds.

Answer: 100 W. Apply $P = \frac{W}{t} = \frac{500}{5}$.

Flashcard 23: What is the formula for power in terms of energy change and time?

Answer: $P = \frac{\triangle E}{t}$. Change in energy over time interval.

Flashcard 24: What is the definition of power in physics?

Answer: Rate of doing work or transferring energy. Fundamental definition in terms of work and energy.

Flashcard 25: What is the formula for power in terms of torque and angular velocity?

Answer: $P = \tau \times \frac{d\theta}{dt}$. Rotational power equals torque times angular velocity.

Flashcard 26: Identify the power if 50 J of work is done in 5 seconds.

Answer: 10 W. Apply $P = \frac{W}{t} = \frac{50}{5}$.

Flashcard 27: Calculate the power if a force of 10 N moves a body at 3 m/s.

Answer: 30 W. Use $P = F \times v = 10 \times 3$.

Flashcard 28: Calculate the power if a machine does 800 J of work in 4 seconds.

Answer: 200 W. Use $P = \frac{W}{t} = \frac{800}{4}$.

Flashcard 29: Determine the power if a light bulb uses 60 J of energy in 1 second.

Answer: 60 W. Energy consumption rate equals 60 joules per second.

Flashcard 30: What is the formula for power in terms of mass, gravity, height, and time?

Answer: $P = \frac{mgh}{t}$. Power to lift mass against gravity over time.