Statement about ball thrown upwards

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In summary, the conversation discusses the incorrect statement in regards to the motion of a ball being thrown vertically upwards with air resistance. The incorrect statement is that the magnitude of acceleration during the upward motion is always greater than 9.81ms-2. This statement is incorrect because the net force acting on the ball during its upward motion is actually directed downwards, due to the presence of air resistance, and is not always greater than 9.81ms-2.
  • #1
chewchun
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Homework Statement


A ball is thrown vertically upwards and air resistance is NOT negligible.Which of the folloiwng statement is incorrect.
A:At maximum height,acceleration is zero.
B: Time taken for ball to travel upwards is shorter than time taken to travel down
C: Distance traveled for upward and downward motion are the same.
D: Magnitude of acceleration for the upward motion is always greater than 9.81ms-2


Homework Equations





The Attempt at a Solution


I choose A instantly as i knew there is acceleration downwards due to gravity.I was right though.
But i have no clue why D is correct?If a ball is facing air resistance wouldn't it slow down(Net force is pointing towards Earth)?
 
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  • #2
so when the ball is going upwards, what are the forces acting on it
 
  • #3
SHISHKABOB said:
so when the ball is going upwards, what are the forces acting on it
Downward:
Resistive force due to air resistance
Gravitational force due to gravity
Upward:
Zero?
 
  • #4
right, so if there's two forces in the downwards direction, and one of them is gravity, then what can we say about the total force acting on the ball
 
  • #5
SHISHKABOB said:
right, so if there's two forces in the downwards direction, and one of them is gravity, then what can we say about the total force acting on the ball

Yes,but won"t it be that total downward force is larger than 9.81ms-2?
But Option D seems to imply that it is accelerating upward.
 
  • #6
chewchun said:
Yes,but won"t it be that total downward force is larger than 9.81ms-2?
But Option D seems to imply that it is accelerating upward.

no it's just asking about the acceleration *during* the upward motion
 
  • #7
SHISHKABOB said:
no it's just asking about the acceleration *during* the upward motion

So option D is saying,When it is traveling upwards,net force/acceleration is acting downwards but it's magnitude is larger than 9.81 due to presence of air resistance?
 
  • #8
that's what D appears to be saying, is that what you think is happening?
 

1. What is the statement about ball thrown upwards?

The statement about ball thrown upwards refers to the physical phenomenon of throwing a ball into the air and observing its motion as it travels upward and then falls back down due to the force of gravity.

2. How does the height of the ball change as it is thrown upwards?

As the ball is thrown upwards, its height increases until it reaches its maximum height and then begins to fall back down due to the force of gravity. The height of the ball continuously changes throughout its motion.

3. What is the role of gravity in the motion of a ball thrown upwards?

Gravity is the force that pulls the ball back towards the ground after it is thrown upwards. It is responsible for the ball's downward acceleration and ultimately causes it to fall back down to the ground.

4. How does the initial velocity affect the motion of a ball thrown upwards?

The initial velocity, or the speed at which the ball is thrown upwards, determines how high the ball will go and how long it will take to reach its maximum height. A greater initial velocity will result in a higher maximum height and a longer time in the air.

5. What factors can affect the motion of a ball thrown upwards?

Aside from the initial velocity, other factors that can affect the motion of a ball thrown upwards include air resistance, the mass and shape of the ball, and the presence of external forces such as wind. These factors can alter the trajectory and speed of the ball as it moves through the air.

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