Physics Trivia: Principal Forces Quiz

Gravity is a fundamental force in nature that attracts all objects towards their center. It is responsible for keeping planets in orbit around the sun, causing objects to fall towards the Earth, and governing the motion of celestial bodies in the universe. Gravity is a universal force that acts on all objects with mass and is directly proportional to the mass of the objects involved. This force is what gives weight to objects and is crucial in understanding the behavior of objects in the universe.

The sign of a proton is "+". This symbol is used to represent a charge that has more protons than electrons, resulting in a net positive charge. In electrical circuits, positive charges are attracted to negative charges and repel other positive charges.

When the north poles of two magnets face each other, they will repel each other. This is because like poles of magnets repel each other due to the magnetic field lines being in opposite directions. Therefore, the correct answer is "Repel".

When the north and south poles of two different magnets face each other, they will attract each other. This is because opposite poles attract each other due to the alignment of magnetic fields. The north pole of one magnet attracts the south pole of the other magnet, creating a force of attraction between them.

A neutral object has the same number of positive and negative charges in its atoms. This means that the positive charges from the protons in the nucleus are balanced out by the negative charges from the electrons orbiting the nucleus. As a result, the object does not have an overall positive or negative charge.

Magnetism has the ability to both attract and repel objects. When two magnets with opposite poles are brought close to each other, they attract each other. On the other hand, when two magnets with like poles are brought close to each other, they repel each other. Therefore, magnetism has the power to both attract and repel objects.

Gold and silver are not magnetic materials, so a magnet does not attract them. The correct answer is "None."

The repulsive or attractive interaction that happens between any two charged bodies is the electrical force. This force is caused by the attraction or repulsion of electric charges. Like charges repel each other, while opposite charges attract each other. This force is responsible for many phenomena, such as the interaction between electrons and protons in atoms, the behavior of magnets, and the functioning of electronic devices.

Friction is not a non-contact force because it requires direct contact between two objects in order to occur. Gravity and magnetism, on the other hand, are non-contact forces as they can act on objects without any physical contact. Therefore, the correct answer is friction.

The force that is usually exerted by a surface on an object resisting it is called the normal force. This force is perpendicular to the surface and acts in the opposite direction to the force applied by the object. It is responsible for supporting the weight of the object and preventing it from sinking into or passing through the surface. The normal force is a contact force and is present whenever there is a surface in contact with an object. It is different from the gravitational force, which is the force exerted by the Earth on an object due to its mass, and the frictional force, which opposes the motion of an object.