Which of the following statements correctly defines a simple machine? A device

Step 1: Analyze the question We are asked for the correct definition of a simple machine. A simple machine is a device that makes work easier by changing the size or direction of a force, or by changing the speed of an action.

Step 2: Explain the concept Simple machines include levers, pulleys, inclined planes, wheel and axle, screws, wedges and gears. They do not reduce the amount of work needed (energy is conserved). They make the work more convenient, for example by letting us apply a smaller force over a larger distance, or by changing the direction of the force.

Examples:

• A crowbar (lever) lets you lift a heavy load with a small effort.
• A pulley lets you pull downward to lift an object upward.
• A ramp (inclined plane) makes it easier to load drums onto a truck.

Step 3: Evaluate each option

• A. Produces electric current: This describes a generator or a cell, not a simple machine. ❌
• B. Only carries people from place to place: This describes a vehicle, and it is too restrictive. ❌
• C. With which work can be done easily: This matches the definition of a simple machine. ✅
• D. Changes the state of rest or uniform motion of an object: This describes a force (Newton's first law), not a machine. ❌

Step 4: Answer The correct option is C.

Tip: Remember the keyword "easier." Any definition of a machine in WASSCE or JAMB will involve making work easier or more convenient, such as by a force multiplier or a change in direction. Also remember that machines never give you more energy output than input, so efficiency is always less than 100%.