Energy and Work Calculations

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. It is calculated using the formula: Work (W) = Force (F) × Distance (d). The unit of work is Joules (J).

Front

How do you calculate the work done when a force is applied?

Back

Work done (W) is calculated using the formula: W = F × d, where F is the force applied in Newtons and d is the distance moved in meters.

Front

What is the formula for calculating potential energy?

Back

Potential Energy (PE) is calculated using the formula: PE = m × g × h, where m is mass in kilograms, g is the acceleration due to gravity (approximately 9.81 m/s²), and h is height in meters.

Front

What is kinetic energy?

Back

Kinetic Energy (KE) is the energy an object possesses due to its motion. It is calculated using the formula: KE = 1/2 × m × v², where m is mass in kilograms and v is velocity in meters per second.

Front

What factors determine the amount of work done?

Back

The two factors that determine work are the size of the force applied and the distance over which the force is applied.

Front

If a force of 20 N moves an object 10 m, how much work is done?

Back

200 J (Work = Force × Distance = 20 N × 10 m).

Front

What is the potential energy of a 1250 kg weight lifted 2 m?

Back

24,500 J (Potential Energy = m × g × h = 1250 kg × 9.81 m/s² × 2 m).

Front

How do you calculate kinetic energy for a moving object?

Back

Use the formula KE = 1/2 × m × v². For example, a 2.1 kg soccer ball moving at 30 m/s has a kinetic energy of 945 J.

Front

What is the unit of work?

Back

The unit of work is Joules (J).

Front

What is the relationship between force, distance, and work?

Back

Work is directly proportional to both the force applied and the distance moved in the direction of the force.