Questions

as requested in detail. [5 marks ]

🎯

Test yourself on this topic

2 questions · timed · auto-graded

Question 15 Marks
Define force. What are its effects on objects?
Answer
A force is a push or pull upon an object resulting from its interaction with another object. It has both magnitude and direction, making it a vector quantity. The unit of force is Newton (N), named after Isaac Newton.
Effects of force :
- Motion change: A stationary object may begin to move; a moving object may stop or change speed.
- Direction change: Force can alter the direction of a moving object.
- Shape change: Some forces deform objects, such as squashing or stretching them.
Examples:
- Kicking a football (starts motion)
- Applying brakes (stops motion)
View full question & answer
Question 25 Marks
Define the different types of forces.
Answer
Force can act on a body from a distance or by being in contact with it. Depending on this, forces can be classified as contact and non-contact forces.
- Contact forces: When a force is applied to an object by direct or indirect physical contact, the applied force is called a contact force.
- Muscular and frictional forces are examples of contact forces.
- Muscular force: The force resulting from the action of muscles is known as the muscular force.
- Frictional force: The force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
- Non-contact forces: When a force is applied to an object by another body that is not in direct contact with it is called a non-contact force.
- Gravitational, magnetic, and electrostatic forces are examples of non-contact forces.
- Gravitational force: The attractive force of the Earth, which acts upon all objects, is known as the force of gravity or just gravity.
- Electrostatic force: The force exerted by a charged body on another charged or uncharged 1 body is known as electrostatic force.
- Magnetic force: The force exerted between a magnet and another magnet or magnetic material is known as magnetic force.
View full question & answer
as requested in detail. [5 marks ] - Science STD 8 Questions - Vidyadip