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6. Intro to Forces (Dynamics)

Newton's First & Second Laws

6. Intro to Forces (Dynamics)

Newton's First & Second Laws

Multiple Choice
A box of mass ma is placed on a frictionless table. It is connected by a string to a hanging mass mb, as shown in the figure. The mass of the string can be neglected. The pulley is frictionless and has a negligible mass. What is the relative value of the acceleration of the masses?
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Multiple Choice
An object that weighs 75 N is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force on this object is 30 N to the left. What is the acceleration of the object?
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Textbook Question
A 500 g ball moves horizontally with velocity v_𝓍 = ( 15 m) / (t + 1 s) for t > 0 s. What is the net force on the ball at t = 1 s?
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Textbook Question
A rocket traveling 1950 m/s away from the Earth at an altitude of 6400 km fires its rockets, which eject gas at a speed of 1200 m/s (relative to the rocket). If the mass of the rocket at this moment is 25,000 kg and an acceleration of 1.5 m/s² is desired, at what rate must the gases be ejected?
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