why does a fly experience greater acceleration when it collids with a fast moving bus
Newton's Third law
action equal in magnitude and opposite in direction to reaction
so if force on the fly is F that on the bus is -F.
Second Law
F = m a
m fly a fly = m bus a bus
so
a fly = a bus (m bus/m fly)
the fly's mass (relative to the bus) means that the momentum of the fly is essentially incorporated into the momentum of the bus
depending on the relative velocities, this can mean a massive acceleration for the fly
... more than the fly's structure can tolerate (squish)
When a fly collides with a fast-moving bus, the fly experiences a greater acceleration because of the difference in their masses.
Acceleration is the rate at which an object's velocity changes over time. It is directly influenced by the mass of the object and the force applied to it. According to Newton's second law of motion, the acceleration of an object is inversely proportional to its mass and directly proportional to the force applied to it.
In the case of a fly colliding with a fast-moving bus, the force exerted on the fly is primarily the force from the bus. Due to the bus's larger mass, it generates a significantly stronger force than the fly. When the force from the bus acts on the fly, it causes the fly to accelerate in the opposite direction.
Since the fly's mass is very small compared to the bus, the force exerted on the fly causes a significant acceleration. This is because the same force applied to a smaller mass results in a greater acceleration.
To calculate the exact acceleration of the fly, you would need to know the mass of the fly and the force applied by the bus. However, in most practical situations, it is difficult to measure these values precisely.
In summary, a fly experiences greater acceleration when it collides with a fast-moving bus because the bus exerts a stronger force on the fly due to the bus's larger mass.