Mechanical Energy, Power, Efficiency, Circular Motion Quiz

What is the formula for calculating mechanical energy?

• ME = KE + PE
• ME = KE - PE
• ME = PE - KE
• ME = KE × PE

Which of the following best describes kinetic energy?

• Energy stored in an object due to its position
• Energy of motion
• Energy transferred through heat
• Energy due to chemical reactions

If a car is moving at a constant speed, what can be said about its kinetic energy?

• It is increasing
• It is decreasing
• It remains constant
• It is zero

What is the unit of power in the International System of Units (SI)?

• Joule
• Watt
• Newton
• Pascal

Which of the following scenarios demonstrates the principle of conservation of mechanical energy?

• A ball thrown upwards
• A car accelerating down a hill
• A pendulum swinging
• All of the above

What is the efficiency of a machine that does 200 J of useful work while consuming 400 J of energy?

• 50%
• 100%
• 25%
• 75%

In circular motion, what is the term for the force that keeps an object moving in a circle?

• Centripetal force
• Frictional force
• Gravitational force
• Tension

Which of the following factors does NOT affect the gravitational potential energy of an object?

• Mass
• Height
• Acceleration due to gravity
• Color of the object

What happens to the kinetic energy of an object if its velocity doubles?

• It doubles
• It triples
• It quadruples
• It remains the same

If a roller coaster is at the top of a hill, what type of energy is maximized?

• Kinetic energy
• Thermal energy
• Mechanical energy
• Potential energy