Imagine holding a basketball in both hands, throwing it straight up as high as y
ID: 1333174 • Letter: I
Question
Imagine holding a basketball in both hands, throwing it straight up as high as you can, and then catching it when it falls. At which points in time does a zero net force act on the ball? Ignore air resistance.
Check all that apply.
just after the ball first leaves your hands
at the instant the falling ball hits your hands
when you hold the ball still in your hands after catching it
at the instant the ball reaches its highest point
when you hold the ball still in your hands before it is thrown
just after the ball first leaves your hands
at the instant the falling ball hits your hands
when you hold the ball still in your hands after catching it
at the instant the ball reaches its highest point
when you hold the ball still in your hands before it is thrown
Explanation / Answer
The answer are in bold
- just after the ball first leaves your hands: Here there is no zero force, remember the gravity force
- at the instant the falling ball hits your hands: When it hits your hands there is a force that stop the ball.
- when you hold the ball still in your hands after catching it: After catching the ball there is at rest so the net force is zero.
-at the instant the ball reaches its highest point: In this point the ball have zero speed but there is a gravity force.
-when you hold the ball still in your hands before it is thrown: before yor throw the ball , it is at rest so there is no force.
-when you hold the ball still in your hands before it is thrown: before yor throw the ball , it is at rest so there is no force.