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An object of mass 2 kg is sliding with a constant velocity of 4ms-1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
- a)32 N
- b)2 N
- c)0 N
- d)8 N
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
An object of mass 2 kg is sliding with a constant velocity of 4ms-1 on...
According to the first law of motion, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced external force
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An object of mass 2 kg is sliding with a constant velocity of 4ms-1 on...
Explanation:
To understand why the force required to keep the object moving with the same velocity is zero, we need to consider Newton's first law of motion, also known as the law of inertia. According to this law, an object will remain at rest or continue moving with a constant velocity unless acted upon by an external force.
Frictionless Surface:
In this scenario, the object is sliding on a frictionless horizontal table. This means that there is no force opposing the motion of the object due to friction. Therefore, no external force is required to counteract friction and keep the object in motion.
Constant Velocity:
The question states that the object is moving with a constant velocity of 4 m/s. This means that the object is not accelerating. In order to maintain this constant velocity, the net force acting on the object must be zero. This is explained by Newton's second law of motion, which states that the net force on an object is equal to the product of its mass and acceleration (F = ma). Since the object's acceleration is zero, the net force must also be zero.
No External Force:
Since the object is already moving with a constant velocity and there is no friction to oppose its motion, there is no need for an external force to keep the object moving. The object will continue moving with the same velocity unless acted upon by an external force.
Conclusion:
Based on the given information, the force required to keep the object moving with the same velocity is zero (option C). This is because there is no friction to oppose the motion and the object is already moving with a constant velocity, indicating that the net force acting on the object is zero.
To understand why the force required to keep the object moving with the same velocity is zero, we need to consider Newton's first law of motion, also known as the law of inertia. According to this law, an object will remain at rest or continue moving with a constant velocity unless acted upon by an external force.
Frictionless Surface:
In this scenario, the object is sliding on a frictionless horizontal table. This means that there is no force opposing the motion of the object due to friction. Therefore, no external force is required to counteract friction and keep the object in motion.
Constant Velocity:
The question states that the object is moving with a constant velocity of 4 m/s. This means that the object is not accelerating. In order to maintain this constant velocity, the net force acting on the object must be zero. This is explained by Newton's second law of motion, which states that the net force on an object is equal to the product of its mass and acceleration (F = ma). Since the object's acceleration is zero, the net force must also be zero.
No External Force:
Since the object is already moving with a constant velocity and there is no friction to oppose its motion, there is no need for an external force to keep the object moving. The object will continue moving with the same velocity unless acted upon by an external force.
Conclusion:
Based on the given information, the force required to keep the object moving with the same velocity is zero (option C). This is because there is no friction to oppose the motion and the object is already moving with a constant velocity, indicating that the net force acting on the object is zero.
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An object of mass 2 kg is sliding with a constant velocity of 4ms-1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity isa)32 Nb)2 Nc)0 Nd)8 NCorrect answer is option 'C'. Can you explain this answer?
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