An Interesting Quiz On Contact Forces

Explanation
Friction is the force that opposes motion between two objects in close contact. When two surfaces rub against each other, the irregularities in their surfaces create resistance, resulting in friction. This force acts in the opposite direction to the motion and can make it difficult for objects to move or slow them down. Friction is a common phenomenon experienced in everyday life, such as when walking on the ground or when trying to slide a heavy object. It is caused by the interaction between the atoms and molecules of the two surfaces in contact.

Explanation
The orbiting of the moon around the earth is an example of a non-contact force because there is no direct physical contact between the moon and the earth. Instead, it is the force of gravity that keeps the moon in its orbit. Gravity is an attractive force that acts between any two objects with mass, even when they are not in direct contact. In this case, the force of gravity between the earth and the moon is what allows the moon to continuously orbit around the earth without any physical contact between the two.

Explanation
When two objects are in direct contact, the types of force that are applied between them are called contact forces. These forces include friction, normal force, tension, and applied force. Contact forces require physical contact between objects for them to occur. Magnetic force and gravitational force are examples of non-contact forces, as they can act on objects without direct physical contact.

Explanation
An example of a non-contact force is electrostatic force. This force is exerted between charged objects without any physical contact between them. It is the force that causes objects to attract or repel each other based on their electric charges. Gravitational force and magnetic force are also non-contact forces, but the question asks for only one example, which is electrostatic force.

Explanation
The basic unit of force is the Newton (N). This is because force is defined as the interaction that causes an object to accelerate or deform. The Newton is the unit used to measure this force, and it is derived from the fundamental units of mass, length, and time. The Joule (J) is the unit of energy, the Watt (W) is the unit of power, and "None of the above" is incorrect as the Newton is indeed the correct answer for the basic unit of force.

Explanation
When a body is responsible for moving another, the force applied can be described as a push and pull force. This type of force involves the exertion of a force in one direction to move an object, and then exerting a force in the opposite direction to bring it back. It is a common type of force that we experience in our everyday lives when we push or pull objects to move them.

Explanation
Tension is an example of a contact force because it occurs when an object is pulled or stretched by another object in direct contact with it. This force is transmitted through physical contact between the two objects, such as when a rope is pulled taut or a spring is stretched. Unlike attraction or repulsion, which are non-contact forces, tension requires direct physical contact between objects to occur. Nuclear force, on the other hand, is a non-contact force that acts within the nucleus of an atom, making it unrelated to tension.

Explanation
Objects can only be affected by electrostatic force if they have charge. The electrostatic force is the force of attraction or repulsion between charged objects. Objects with no charge will not experience any electrostatic force. Mass, frequency, and shape do not directly affect the electrostatic force between objects.

Explanation
A force can be defined as a push or a pull. It is a physical interaction between two objects that causes a change in their motion or shape. When an object is pushed or pulled, a force is exerted on it, which can result in acceleration or deformation. Therefore, the answer "A push and pull" accurately describes the nature of a force.

Explanation
Elasticity is the property of a material that allows it to return to its original shape and size after being stretched or compressed by an external force. When an object is stretched or compressed, the elastic force within the material pulls it back to its original state. This force is called elasticity or elastic force. Gravitational force is the force of attraction between two objects with mass, tension is the force exerted by a string or rope when it is pulled, and magnetic force is the force exerted by magnets.