5 Questions
Which type of frictional force acts on an object that is at rest?
Static friction
What type of force prevents an object from falling to the ground?
Normal force
Which force arises from the interaction between two surfaces in contact?
Frictional force
What kind of force is responsible for objects falling to the ground?
Gravitational force
Which force does not require physical contact between objects to act?
Gravitational force
Study Notes
Types of Forces
In physics, a force is defined as an interaction that changes the motion of an object if unopposed. It can be described as a push or pull experienced by an object. Forces are classified into two main categories: contact forces and non-contact forces.
Contact Forces
Frictional Force
Frictional force is the force that opposes the motion of an object across a surface. It arises from the interaction between two surfaces in contact. There are two types of frictional forces: static friction and kinetic friction. Static friction acts on an object that is at rest, while kinetic friction acts on an object that is moving.
Applied Force
An applied force is a force that is applied to an object by a person or another object. It is the force exerted on the object by an external force, such as pushing or pulling.
Normal Force
The normal force is the support force exerted upon an object that is in contact with another stable object. It is the force that prevents an object from falling to the ground or from moving away from its current position.
Non-Contact Forces
Gravitational Force
Gravitational force is the force of attraction between two masses. Every mass on Earth experiences a gravitational force due to the Earth's mass. This force is responsible for objects falling to the ground and for the motion of planets in their orbits.
Electromagnetic Force
The electromagnetic force is a fundamental force in nature that is responsible for the interactions between charged particles. It is the force that causes objects to be attracted or repelled based on their charges.
Weak Nuclear Force
The weak nuclear force is a fundamental force that is responsible for certain types of radioactive decay. It is a relatively weak force that only acts at very short distances.
Strong Nuclear Force
The strong nuclear force is a fundamental force that binds together the protons and neutrons in the nucleus of an atom. It is a very strong force that only acts at very short distances.
Learn about the different types of forces in physics, including contact forces like frictional force, applied force, and normal force, as well as non-contact forces like gravitational force, electromagnetic force, weak nuclear force, and strong nuclear force.
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