science
Grade-7
Easy
Question
A laptop lying on the table is under the action of ___.
- Contact forces
- Non-contact forces
- Balanced forces
- Unbalanced forces
Hint:
Balanced forces: 2 forces acting on the body are equal in magnitude but opposite in direction. They don't cause motion.
The correct answer is: Balanced forces
- The body is acted upon by 2 forces: Due to the weight of the object, a force is exerted on the table equal to the weight of the object(gravitational force). The table in return exerts a reaction force on the object equal to the magnitude of the weight but opposite in direction (Newton's third law).
- Reaction force is a contact force.
- Gravitational force is a non-contact force.
- Unbalanced forces cause change in speed/direction of a body.
- Forces acting on the laptop lying on the table are balanced in nature.
- Hence, correct option is c.
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