An object is thrown vertically upwards with velocity u. Under the influence of gravity, the acceleration:
Acceleration of Object Thrown Upwards Under Gravity
When an object is thrown vertically upwards with an initial velocity $u$, it moves against the force of gravity.
Understanding Acceleration Due to Gravity:
- Gravity ($g$) is a constant force that pulls objects towards the center of the Earth.
- This force acts downwards, regardless of the object's direction of motion.
Analysis of Options:
- Option 1: becomes zero at the highest point
This is incorrect. While the object's velocity becomes momentarily zero at the highest point, gravity ($g$) still acts downwards, causing the object to start falling. - Option 2: acts in the direction of motion
This is incorrect for the upward journey. The direction of motion is upwards, but gravity acts downwards. This statement would be true during the downward fall. - Option 3: acts opposite to the direction of motion
This is correct. As the object moves upwards (direction of motion is up), the acceleration due to gravity acts downwards, opposing the motion and causing the object to slow down. - Option 4: increases the upward velocity
This is incorrect. Since the acceleration acts opposite to the upward velocity, it decreases the upward velocity, eventually bringing it to zero at the peak.
Therefore, the acceleration due to gravity always acts downwards, opposing the upward motion of the object.
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