Question

part 4: connections & conclusions
directions: after you learn about newtons third law and interacting force pairs (action - reaction forces), answer the following questions in complete sentences.

1. make connections between newtons third law and your everyday life. you must make one connection between them. (1 pt)
2. drawing conclusions: what do you notice about the magnitude (size) and direction of the action - reaction forces? use evidence from websites and this assignment to support your response. your answer must be 3 - 4 sentences long. (1 pt)
3. while driving down the firefly strikes the windshield of a bus and makes a quite obvious mess in front of the face of the driver. this is a clear case of newtons third law of motion. the firefly hit the bus and the bus hits the firefly. which of the two forces is greater: the force on the firefly or the force on the bus? explain your answer. (1 pt)
4. making connections: how does newtons third law connect to what we learned about his first and second laws? you must make at least two connections between them to earn full credit. (1 pt)
5. i need extra help with... what are one (or more) concepts from todays lesson that you are struggling to understand? in other words, what are you still confused about? (1 pt)

Explanation:

1. When you walk, you push the ground (action force), and the ground pushes you back (reaction force), enabling you to move forward. This is an example of Newton's third law in daily life.
2. According to Newton's third law, action - reaction forces are equal in magnitude and opposite in direction. For instance, if object A exerts a force \(F_{AB}\) on object B, then object B exerts a force \(F_{BA}\) on object A, and \(F_{AB}=-F_{BA}\). The negative sign indicates the opposite direction.
3. The force on the firefly and the force on the bus are equal. Newton's third law states that for every action, there is an equal and opposite reaction. So, when the firefly hits the bus (\(F_{firefly - bus}\)), the bus hits the firefly (\(F_{bus - firefly}\)) with the same magnitude of force, \(F_{firefly - bus}=-F_{bus - firefly}\).
4. - All three laws deal with forces and motion. The first law (\(F = 0\), \(a=0\), object in uniform motion or at rest) can be seen as a special case of the second law (\(F = ma\), when \(F = 0\), \(a = 0\)). The third law provides the context for the forces considered in the first and second laws. For example, when analyzing the motion of an object (using \(F = ma\)), we need to consider all the forces acting on it, and these forces come in action - reaction pairs as per the third law.

• The second law (\(F=ma\)) focuses on the relationship between the net force on an object and its acceleration. The third law helps in identifying all the forces (action - reaction pairs) that contribute to the net force in the second law.

Answer:

1. When walking, the push on the ground (action) and the ground's push back (reaction) (Newton's third law) help us move.
2. Action - reaction forces are equal in magnitude (\(F_{AB}=-F_{BA}\)) and opposite in direction.
3. The forces are equal. By Newton's third law (\(F_{firefly - bus}=-F_{bus - firefly}\)).
4. - All laws relate to force and motion; first is a special case of the second (\(F = 0\) in \(F=ma\)). Third law gives force context for first and second. - Second law (\(F = ma\)) uses forces (from third - law pairs) to find acceleration.