Work and Power

Front

What is the relationship between work, power, and time?

Back

Power is the amount of work done per unit of time. It can be calculated using the formula: Power = Work / Time.

Front

How does increasing work while decreasing time affect power?

Back

Increasing work while decreasing time results in more power, as power is directly proportional to work and inversely proportional to time.

Front

What is negative work and when does it occur?

Back

Negative work occurs when the direction of the applied force is opposite to the direction of the object's displacement.

Front

What happens to work done when the force applied is perpendicular to the displacement?

Back

No work is done when the direction of the displacement is perpendicular to the direction of the applied force.

Front

How is power calculated when given work and time?

Back

Power can be calculated using the formula: Power = Work / Time. For example, if 40.2 J of work is done in 3.3 seconds, Power = 40.2 J / 3.3 s = 12.18 W.

Front

Define work in the context of 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 = Force x Distance x cos(θ), where θ is the angle between the force and the direction of motion.

Front

What units are used to measure work?

Back

Work is measured in joules (J) in the International System of Units (SI).

Front

What is the unit of power and how is it defined?

Back

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

Front

Explain the concept of mechanical advantage in relation to work and power.

Back

Mechanical advantage refers to the factor by which a machine multiplies the force put into it. It allows for the same amount of work to be done with less input force, thus affecting the power required.

Front

What is the significance of the angle in the work formula?

Back

The angle (θ) in the work formula determines how much of the applied force contributes to the work done. If the angle is 0 degrees, all the force contributes to the work; if it is 90 degrees, no work is done.