Class 8 Exam > Class 8 Videos > Science Class 8 > Contact Forces and its Types (part -1)
Contact Forces and its Types (part -1) Video Lecture | Science Class 8
FAQs on Contact Forces and its Types (part -1) Video Lecture - Science Class 8
| 1. What are contact forces? |  |
Ans. Contact forces are forces that act when two objects come into physical contact with each other. These forces can either push or pull objects and are transmitted through direct contact between the surfaces of the objects.
| 2. What are the types of contact forces? | |
Ans. There are several types of contact forces. Some common ones include:
1. Frictional force: This force opposes the motion of an object and occurs when two surfaces rub against each other.
2. Normal force: This force acts perpendicular to the surface of an object and prevents it from sinking into another object when they are in contact.
3. Tension force: This force is exerted by a string, rope, or cable when it is pulled taut.
4. Applied force: This force is exerted by a person or an object when it pushes or pulls another object.
5. Air resistance force: This force opposes the motion of an object through the air and is experienced by objects moving through a fluid medium.
| 3. How does frictional force work? | |
Ans. Frictional force occurs when two surfaces are in contact and move against each other. It acts in the opposite direction to the motion of the object and opposes its movement. Frictional force depends on factors such as the roughness of the surfaces and the weight of the object. It can be increased by increasing the force pressing the surfaces together or by increasing the roughness of the surfaces.
| 4. What is the normal force? | |
Ans. The normal force is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface and prevents the object from sinking into the surface. The magnitude of the normal force is equal to the weight of the object when it is at rest or in equilibrium.
| 5. How is tension force applied? | |
Ans. Tension force is applied by a string, rope, or cable when it is pulled taut. It acts along the direction of the string and is transmitted through the string to the objects it is attached to. Tension force can be used to lift objects, hold objects in place, or transmit forces in various mechanical systems.
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