The figure above shows the forces exerted on a block that is sliding on a rough horizontal surface: The weight of the block is 500 N, the normal force is 500 N, the frictional force is 100 N, and there is an unknown force F exerted to the right. The acceleration of the block is 0.4  m/s2. The value of F is most nearly

Q: F m

A: Given: Force = 200N  θ=35° friction coefficient μ = 0.2  Mass of the block = 15 kg

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Q: What is a common example of a nonconservative force? O tension O gravity O normal force O friction

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!