Which of the following forces supports a person standing up at rest?
Inertia
Normal Force
Friction Force
Gravitational Force
Compression/ Tension Force
The Normal Force and the Gravitational Force support a person standing up at rest.
The force that supports a person standing up at rest is the Normal Force.
To understand why this is the correct answer, let's break down the options:
1. Inertia: Inertia is the tendency of an object to resist changes in its motion. While inertia keeps a person standing still once they are at rest, it doesn't actually support them.
2. Friction Force: Friction is the force that opposes the relative motion between two surfaces in contact. While friction is relevant when a person is walking or sliding, it doesn't play a significant role when a person is standing still.
3. Gravitational Force: Gravitational force is the force that attracts objects to each other due to their mass. It pulls objects towards the center of the Earth. While gravity acts on a person standing up, it doesn't support them in standing. Instead, gravity pulls the person downward, and the support comes from another force.
4. Compression/Tension Force: Compression and tension forces come into play when objects are being compressed or stretched. While they are relevant in scenarios with external forces like pulling on or pushing against an object, they are not the forces supporting a person standing up at rest.
So, the correct answer is the Normal Force. The Normal Force is the force exerted by a surface that is in contact with an object. In the case of a person standing up at rest, the floor pushes upward with an equal force to counteract the downward force of gravity. This upward force is known as the Normal Force and supports the person in maintaining their position.