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Questions and Answers
What term is used in science to describe a push or pull on an object?
What term is used in science to describe a push or pull on an object?
Which characteristic of force expresses its strength?
Which characteristic of force expresses its strength?
What type of force is exerted when kicking a football?
What type of force is exerted when kicking a football?
What do vector quantities in science express?
What do vector quantities in science express?
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Which force is responsible for the attraction or repulsion between two magnetic bodies?
Which force is responsible for the attraction or repulsion between two magnetic bodies?
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What is the definition of inertia based on the text?
What is the definition of inertia based on the text?
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Which type of force requires touch or contact to be applied?
Which type of force requires touch or contact to be applied?
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What is the upward force exerted by a fluid on an object known as?
What is the upward force exerted by a fluid on an object known as?
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What is the significance of velocity in defining the state of motion of an object?
What is the significance of velocity in defining the state of motion of an object?
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What type of forces are Gravitational force and Electrostatic force classified as?
What type of forces are Gravitational force and Electrostatic force classified as?
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Study Notes
Introduction to Force
- A push or pull of an object is known as force, which arises from the interaction between two objects.
- Force has both magnitude and direction, and its strength is expressed in magnitude.
- Force brings about a change in the direction or state of motion of a body.
Types of Force
- A push is a force exerted away from the body, e.g., hitting a snooker ball or kicking a football.
- A pull is a force exerted towards the body, e.g., drawing a bucket of water from a well or playing tug of war.
- Magnetic force is the force of attraction or repulsion between two magnetic bodies due to their poles.
Characteristics of Force
- Force is a vector quantity, expressed in magnitude and direction.
- Vectors are used to find the resultant component acting on a body when multiple forces act on it.
- Net force is the resulting force acting on an object when multiple forces are applied.
Application of Force
- A force can change the state of an object at rest or in motion.
- It can change an object's direction and velocity.
- Force can also change the shape of an object.
State of Motion
- The state of motion of an object is defined by its velocity, which is the speed with a direction.
- Inertia is the tendency of an object to resist changes in its velocity.
- An object at rest or in motion will remain in its state of motion unless an unbalanced force is applied.
Contact Forces
- Contact forces require a touch or contact to be applied, e.g., muscular forces and frictional forces.
- Muscular force is the force applied by the effort of our muscles, e.g., lifting a heavy box or pulling a bucket of water.
Non-Contact Forces
- Non-contact forces do not require a touch or contact to be applied, e.g., gravitational force, electrostatic force, and nuclear forces.
- Electrostatic force is the force of attraction or repulsion experienced by a charged body from another charged body.
Pressure
- Pressure is the force exerted per unit area, and its distribution is affected by the shape of the object.
- Pressure in fluids is transmitted undiminished in all directions on the walls of the container.
- Upthrust or buoyant force is the upward force exerted by a fluid on an object.
- Atmospheric pressure is the pressure exerted by gases in the air on the surface of the Earth.
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Description
Explore key concepts related to force and pressure as per the CBSE Class 8 syllabus. Understand the characteristics, types, and effects of force on objects. Test your knowledge on forces and pressures in this chapter.
