Please help me with question 2 & question 3. Thanks to helper. 2) If an object i
ID: 1630896 • Letter: P
Question
Please help me with question 2 & question 3. Thanks to helper. 2) If an object is subjected to a net force of Fnet- 0, is it possible that the object is moving with a certain velocity? 3) Which of Newton's laws is demonstrated: 1. Two students are in a baseball game. The first student hits a ball very hard and it has a greater acceleration than the second student who bunts the ball lightly 2. A picture is hanging on the wall and does not move. 3. A fish swims through the water moving at a constant speed. (Hint: As the fish moves forward it pushes the water backwards.
Explanation / Answer
Q2) If an object is subject to a net force of Fnet=0, is it possible that the object is moving witha certain velocity?
Ans: It is possible that the object is moving with a certain velocity because-
i) An object will be at rest or in motion if no net external force acts on it. It is the first law of motion.
ii) Fnet=0 requires accleration to be zero by using formula F=ma, so to it won't acclerate or decclerate but it could be moving with constant velocity (if friction is not considered).
Q3)Which of the newton's law is demonstrated-
1) Two boys in a baseball game. The first student hits a ball vey hard and it has a greater acceleration than the second student who bunts the ball lightly.
Ans- Netwon's Second law of motion- we know, F=ma. The greater the mass of the object the more force it requires to accelerate or move it.
2) A picture is hanging on the wall and does not move.
Ans- Newton's first law of motion . An object continues to be at rest or in motion unless an external force acts on it.
3) A fish swims through the water moving at constant speed.
Ans- Newton's third law of motion- The fish uses fins to push water backward(action), but since the water doesn't accelerate. hence water must also be applying a reaction force and pushing the fish forward. Action-reaction force pairs make it possible for fish to swim.