Work and Power Flashcard Review

Front

What is Work in physics?

Back

Work is defined as the product of the force applied to an object and the distance over which that force is applied in the direction of the force. It is calculated using the formula: Work (W) = Force (F) × Distance (d) × cos(θ), where θ is the angle between the force and the direction of motion.

Front

What is the formula for calculating Work?

Back

The formula for calculating work is: W = F × d × cos(θ), where W is work, F is the force applied, d is the distance moved in the direction of the force, and θ is the angle between the force and the direction of motion.

Front

What is Power in physics?

Back

Power is the rate at which work is done or energy is transferred over time. It is calculated using the formula: Power (P) = Work (W) / Time (t).

Front

How do you calculate Power?

Back

Power can be calculated using the formula: P = W / t, where P is power, W is work done, and t is the time taken to do the work.

Front

What is the unit of Work?

Back

The unit of work is the Joule (J), which is defined as the work done when a force of one newton displaces an object by one meter in the direction of the force.

Front

What is the unit of Power?

Back

The unit of power is the Watt (W), which is defined as one joule per second (1 W = 1 J/s).

Front

How does the angle between force and displacement affect Work?

Back

The angle between the force and the direction of displacement affects the amount of work done. If the angle is 0 degrees (force and displacement in the same direction), maximum work is done. If the angle is 90 degrees, no work is done.

Front

What is the significance of the cosine function in the Work formula?

Back

The cosine function in the work formula accounts for the direction of the force relative to the direction of motion. It determines how much of the force contributes to the work done.

Front

Calculate the work done if a force of 50 N is applied over a distance of 10 m in the direction of the force.

Back

W = F × d = 50 N × 10 m = 500 J.

Front

Calculate the work done if a force of 100 N is applied at an angle of 60 degrees over a distance of 5 m.

Back

W = F × d × cos(θ) = 100 N × 5 m × cos(60°) = 100 N × 5 m × 0.5 = 250 J.