A force of 320 N pulls on a 50 kg object in the positive x-direction (to the right), while a second force of 250 N pulls on the same object in the negative x-direction (to the left). A) What is the magnitude and direction of the resultant force? B) Calculate the acceleration of the object.
2. A worker pulls a large 60 kg box to the right across a frictionless floor with a 180 N force applied in a direction of 30 degrees above the horizontal. A) What is the horizontal, or x-component, of the force? B) What is the vertical, or y-component of the force? C) Calculate the acceleration of the box.
3. A) Calculate the mass (in slugs) of a rock that weighs 100 pounds on the surface of Mars. B) What is the mass of the same rock if it were sitting on the moon? C) How much would this rock weigh (in pounds) on the moon? (assume that gmoon = 5.3 ft/sec^2 and gMARS = 3.71 m/sec^2)
4. Assuming that a force of 120 N is pulling an object across a rough surface at a speed of 20 m/s to the right, while friction is causing a drag force of 120 N to the left, what is the speed of the object 12 seconds later?
5. What is the magnitude of the friction force on a 40 kg mass sliding along a horizontal surface where the coefficient of friction between the surface and the object is μk = 0.28?