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Situation B: Suppose you are biking one fine day. You have seen that there is a pile of leaves in front of you. Wind blows causing the pile of leaves to spread.
1) How would you compare the effect of a light breeze of wind and a huge amount of wind on that pile of leaves?
2) What physical quantity was varied in this situation?
3) What relationship exists between the varying physical quantity and acceleration?
Situation A: You are on a trip with your friends. Then suddenly, the car stopped because it ran out of gas. To avoid causing traffic, the car must be pushed to the side of the road.
1) When will the car move (accelerate) faster, when only 1 person pushes it or when more persons push it? Justify your answer.
2) What physical quantity was changed in this situation?
3) What relationship exists between the varying physical quantity and acceleration?
A hole of cross-sectional area 100 c m 2 is cut in a piece of steel at 20 o C . What is the area of the hole if the steel is heated from 20 o C to 100 o C ? The coefficient of linear expansion of steel is 1.10 × 10 − 5 o C
Study it. In which of it does the boy exerted a greater force?
A. The boy pulling the rope tied in the wall
B. The boy pulling the rope tied in the elephant
Explain your answer
Directions: Briefly discuss the problem below. In answering, explain the physics of
your proposed method. Be sure to include all of Newton’s Laws of
Motion in your answer.
A space station worker found herself floating free 100 meters from the space
station because her safety line became unhooked. Attached to her space suit
were her unhooked safety line, her tool belt and tools, and her oxygen tank.
How could she get back to the space station without calling someone for
help?
Directions: Briefly discuss the problem below. In answering, explain the physics of
your proposed method. Be sure to include all of Newton’s Laws of
Motion in your answer.
A space station worker found herself floating free 100 meters from the space
station because her safety line became unhooked. Attached to her space suit
were her unhooked safety line, her tool belt and tools, and her oxygen tank.
How could she get back to the space station without calling someone for
help?
Walking is something that we do every day without thinking about it. Very
simple daily activity and straight forward. Try to observe when you walk inside your
house. Put one foot in front of the other and you move. What forces have to do with
walking?Thus equal and opposite reaction applied?
While driving down the road, a 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
Newton's 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?
Consider the following three examples. One of the forces in the mutual
interaction is described; describe the other force in the action-reaction force
pair.
A. A boy pulling something
B. A bowling ball hitting pins
C. Flying balloon filled with helium
Materials: 2 rubber bonds and ruler/ tape measure
Procedure:
1. Tie the two rubber bond together.
2. Each person should pull back the end of the rubber bond. Record the two
readings using a ruler or tape measure.
Think about it:
1. What did you notice about the readings in step 2 to 4?
2. What can you conclude about the pair of forces in each situation?
