Choose whether each of the following statements is true or false
1 answer:
Answer:
1. The statement is false.
2. The statement is false.
Explanation:
1. When a ball is thrown vertically up, the air drag is acting downwards which reduces the time the ball spends traveling upwards, but the air drag is acting upwards while the ball is falling, which increases the time the ball spends traveling downwards.
Thus, the statement is false.
2. The potential energy of a particle is given by
where, is the mass of the object,
is the acceleration due to gravity and
is the vertical height traveled by the object.
It does not depend on th initial velocity of the object.
Thus, the statement is false.
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There are two external force acts on the chair.
1. The force due to earth gravity, acts in the downward direction.
2. Reaction force of the gravity, which acts in the Upward direction (Normal Force).
On every object, there is a force acts due to gravity of earth, which pulls the object towards the centre of earth, known as gravity force, always acts in the downward direction. Mathematically it's given as
F=mg
here, m is the mass of the object, and g is the acceleration of gravity.
To balance this gravity force, a counter force acts in the opposite direction, whose magnitude is equal to the force of gravity
