Kinetic Energy Concepts and Calculations

This video tutorial explains kinetic energy, its definition, and how to calculate it using the equation KE = 0.5 * mass * speed^2. It provides examples of kinetic energy in various objects like cars, cyclists, and tennis balls. The video also includes sample calculations to demonstrate how to compute kinetic energy and rearrange the equation to find mass. Viewers are encouraged to practice with additional questions available in the workbook.

What is kinetic energy?

• Energy stored in stationary objects

• Energy stored in chemical bonds

• Energy stored in moving objects

• Energy stored in electrical fields

Which of the following objects does NOT have kinetic energy?

• A moving train

• A parked car

• A roller coaster in motion

• A Formula One car racing

What is the formula for calculating kinetic energy?

• 0.5 × mass × speed²

• mass × speed

• mass × speed²

• 0.5 × mass × speed

Why is it important to memorize the kinetic energy formula for exams?

• It is only used in practical exams

• It is not provided in exams

• It is always provided in exams

• It is rarely used in exams

A car with a mass of 700 kg is moving at 20 m/s. What is its kinetic energy in joules?

• 140,000 J

• 35,000 J

• 70,000 J

• 280,000 J

How do scientists often convert joules to kilojoules?

• Add 1,000

• Divide by 1,000

• Subtract 1,000

• Multiply by 1,000

A cyclist and bike have a total mass of 100 kg and a speed of 15 m/s. What is their kinetic energy in joules?

• 1,250 J

• 112,500 J

• 1,125 J

• 11,250 J

What is the kinetic energy of a cyclist and bike with a total mass of 100 kg moving at 15 m/s in kilojoules?

• 11.25 kJ

• 0.1125 kJ

• 112.5 kJ

• 1.125 kJ

A tennis ball is traveling at 50 m/s with a kinetic energy of 75 J. What is its mass?

• 0.006 kg

• 6 kg

• 0.6 kg

• 0.06 kg

How do you rearrange the kinetic energy formula to solve for mass?

• mass = kinetic energy × speed²

• mass = kinetic energy × 0.5 / speed²

• mass = kinetic energy / (0.5 × speed²)

• mass = kinetic energy / speed