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A doorstop is a wedge, which is essentially two inclined planes joined back-to-back. It converts a pushing force into sideways pressure that holds the door in place. Recognizing such everyday applications of simple machines demonstrates practical mechanical reasoning.

Each bounce loses part of its mechanical energy to sound, heat, and internal deformation of the ball and ground. As energy decreases, the ball bounces lower until it eventually stops. This illustrates conservation and dissipation of energy.

Seatbelts restrain passengers, preventing inertia from propelling them forward during sudden stops or collisions. According to Newton’s First Law, objects in motion remain in motion unless acted upon by an external force. Seatbelts provide this force safely, protecting passengers.

Capillary action occurs because adhesive forces between water molecules and tube walls, combined with cohesion among water molecules, pull liquid upward. This effect is seen in plants drawing water through roots and in porous materials. Mechanical aptitude exams may test this to connect fluid behavior with real-world applications.

A barometer measures atmospheric pressure. Manometers measure pressure in closed systems, hydrometers measure liquid density, and thermometers measure temperature. Understanding pressure measurement is vital in hydraulics and mechanical systems, where pressure directly affects safety and operation.