Work and Energy Calculations

The video tutorial explains how to calculate the work done by a crane lifting a car. It starts by identifying the given quantities, such as the mass of the car and the height it is lifted. The tutorial then explains the formula for work done, which is the product of force and displacement. The force is calculated as the weight of the car, using its mass and gravitational acceleration. Finally, the work done is calculated and converted from joules to kilojoules.

What is the mass of the car that the crane lifts?

• 700 kg

• 400 kg

• 500 kg

• 600 kg

To what height is the car lifted by the crane?

• 5 meters

• 4 meters

• 3 meters

• 2 meters

What is the formula used to calculate work done?

• Force + Displacement

• Force / Displacement

• Force - Displacement

• Force x Displacement

How is the force calculated in this scenario?

• Mass x Distance

• Mass x Acceleration

• Mass x Gravity

• Mass x Velocity

What is the value of gravity used in the calculation if not specified?

• 9.8 m/s²

• 11.8 m/s²

• 8.9 m/s²

• 10.8 m/s²

What is the work done by the crane in joules?

• 18600 J

• 19600 J

• 20600 J

• 21600 J

How do you convert joules to kilojoules?

• Divide by 100

• Multiply by 100

• Divide by 1000

• Multiply by 1000

What is the work done by the crane in kilojoules?

• 21.6 kJ

• 20.6 kJ

• 19.6 kJ

• 18.6 kJ