18. To maximize the torque a given produces, one should apply the force at the p

Question

18. To maximize the torque a given produces, one should apply the force at the pivot point. 19. Earth exerts a larger gravitational force on an ant than an ant than an ant exerts on Earth. 20. The mass of the Moon was determined by observing its orbit about Earth. Answer the following questions by applying one of Newton's laws. 21. Why might you break your foot if you kick a wall? 22. If an object is accelerating, there must be a net force acting on it. How do we know this? 23. A ball is being twirled in a circle as shown. When the ball is in the pictured configuration, the string breaks. Predict which way the ball will travel (ignore gravity) and explain why.

Explanation / Answer

(21)

According to Newton’s third law, every action there is an equal and opposite reaction. So if you apply a force by kicking the wall, the wall also apply same force on your foot.

(22)

According to Newton’s second law, net force acting on an object is equal to product of its mass and acceleration. So the net force acts on the accelerating object.

(23)

According to Newton’s first law, due to inertia of motion the ball travel horizontally when the string breaks.

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