 Practice Problems Net F = ma

Directions: On this worksheet, positive horizontal directions are towards the right and positive vertical directions are upwards. omit
Question 1  What is the net force acting on a 7-kg mass if it is accelerating at a rate of 5 m/sec2?  omit
Question 2  What is the magnitude of the frictional force present if a 7-kg mass being pulled by a horizontal force of 9 newtons towards the right experiences an acceleration of -1.71 m/sec2?  omit
Question 3  A 7-kg mass experiences two vertical forces: 64.8 newtons pulling upward and 68.6 newtons pulling downward. What acceleration does the 7-kg mass undergo?  omit
Question 4  A 7-kg mass is being pulled towards the right with a rope that has a tension of 63 newtons at an angle of 25 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop?  omit
Question 5  A 18-gram bullet travelling at 90 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 25 centimeters, what average resistive force did the tree exert upon it? 