5. For parts a. and b. circle the correct answers. A mosquito collides head-on w

Question

5. For parts a. and b. circle the correct answers. A mosquito collides head-on with a car traveling 60 mph. Comparing the magnitude of the acceleration the mosquito experiences to that of the car the mosquito's acceleration is: a. 1) Larger 2) Smaller 3) The same Why? b. For uniform circular motion, circle the parameters that are constant: velocity angular velocity, centripetal acceleration, magnitude of the tangential acceleration, magnitude of the net force. For parts c. and d. answer yes or no and then explain with an example or reason. c. If all of the forces acting on a moving object are known, can you tell the direction the object is moving? If yes, explain how. If no give an example. d. When a weight falls onto a spring compressing it fully is mechanical energy conserved? If yes explain the energy conversion. If no, why not?

Explanation / Answer

5)

a) 2) larger

because, the force on the car exerted by the mosquito and force exerted by mosquito on the car are same.

we know, acceleration a = F/m

mass of mosquito is very small. so, its acceeration is large.

b)

angular velocity

magnitude of the net force.

c) No. The object may not move in the direction of net force. But the object accelerate in the direction of net force.

Example: vaertically projected body.

when the body moves up, net force acts downward but the body moves upward.

d) Yes.

Because, spring force and gravity are the conservative forces.

when conservative forces only act on a system total mechanical energy of the system is conserved.

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