3rd Final Exam Review (Newton laws and Forces)

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9 Terms

1
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Which of Newton's Laws does this situation represent?Imagine a ball moving on an ice surface in a straight line for 10 seconds and colliding with another ball at rest.The moving ball exerts a force on the ball at rest. This causes the ball at rest to accelerate.However, the ball at rest also exerts the same magnitude of force (in the opposite direction) on
the moving ball. This will cause the moving ball to deacelerate or even move in another direction.

All three laws

2
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A book is sitting on a desktop. Identify the 3rd law partner of the Normal force applied by the table on the book?

the force created by the book on the desk

3
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What is the approximate weight of a woman on Moon who has a mass of 30 kg on Earth?         

   consider gravitational acceleration as ~ 10 m/s2            consider gravitational acceleration on Moon as ~ 1.67 m/s2

50 N

4
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<p>Determine the Net Force present in the depicted scenario</p>

Determine the Net Force present in the depicted scenario

33 N to the left

5
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An object accelerates 9 m/s2when a force of 81 N is applied to it. What is the mass of the object?

9 kg

6
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You are pushing a crate rightwards with a mass of 35 kg with a force of 450 N. The surface is rough, and the frictional force has a magnitude of 100 N. The net force on the mass (Hint draw a diagram and mark the forces on the diagram)

Rightwards, 350 N

7
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You are pushing a crate rightwards with a mass of 35 kg with a force of 450 N. The surface is rough, and the frictional force has a magnitude of 100 N. What is the acceleration of the crate? (Hint draw a diagram and mark the forces on the diagram)

10 m/s^-2 to the right

8
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<p>What happens to its kinetic and potential energy as a pendulum swings from its highest to the lowest position?</p>

What happens to its kinetic and potential energy as a pendulum swings from its highest to the lowest position?

The PE decreases while the KE increases

9
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Sam's total energy (KE + PE ) is 4000 J as he reached 10 m above the ground in a sky-diving airplane.Sam jumped from the airplane when the airplane was at zero speed. His parachute malfunctioned and he was in free fall.What is Sam's kinetic energy just before he reaches the ground level?Note: neglect the Thermal Energy

4000 J