6 Questions
What is the direction of a normal force?
Perpendicular to the surface
Which of the following is an example of a non-contact force?
Gravitational force
What is the net force acting on an object?
The resultant force acting on an object, calculated by vector addition of individual forces
What is the relationship between force and acceleration?
Force is directly proportional to acceleration
According to Newton's Third Law, what is the relationship between action and reaction?
The action is equal to the reaction
What is the SI unit of force?
Newton (N)
Study Notes
Definition of Force
- A force is a push or pull that causes an object to change its motion or shape.
- It is a vector quantity, having both magnitude (amount of force) and direction.
Types of Forces
-
Contact Forces:
- Frictional force (resists motion between two surfaces in contact)
- Tension force (in a stretched string or wire)
- Normal force (perpendicular to a surface, exerted by a surface on an object)
-
Non-Contact Forces:
- Gravitational force (attracts two objects with mass)
- Electromagnetic force (acts between charged particles)
- Nuclear force (holds protons and neutrons together in an atomic nucleus)
Characteristics of Forces
- Net Force: The resultant force acting on an object, calculated by vector addition of individual forces.
- Force and Acceleration: Force is directly proportional to acceleration (F = ma).
- Force and Mass: Force is directly proportional to mass (F = ma, with acceleration constant).
- Action and Reaction: For every action, there is an equal and opposite reaction (Newton's Third Law).
Force Units
- SI Unit: Newton (N)
- Other Units: pound-force (lbf), kilogram-force (kgf), dyne
Definition and Characteristics of Force
- A force is a push or pull that causes an object to change its motion or shape.
- Force is a vector quantity, having both magnitude (amount of force) and direction.
Types of Forces
- Contact Forces: • Frictional force: resists motion between two surfaces in contact. • Tension force: acts in a stretched string or wire. • Normal force: perpendicular to a surface, exerted by a surface on an object.
- Non-Contact Forces: • Gravitational force: attracts two objects with mass. • Electromagnetic force: acts between charged particles. • Nuclear force: holds protons and neutrons together in an atomic nucleus.
Characteristics of Forces
- Net Force: the resultant force acting on an object, calculated by vector addition of individual forces.
- Force and Acceleration: force is directly proportional to acceleration (F = ma).
- Force and Mass: force is directly proportional to mass (F = ma, with acceleration constant).
- Action and Reaction: for every action, there is an equal and opposite reaction (Newton's Third Law).
Force Units
- SI Unit: Newton (N)
- Other Units: pound-force (lbf), kilogram-force (kgf), dyne
Learn about the concept of force, types of forces, and their effects on objects. Understand contact and non-contact forces, including friction, tension, and gravity.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
