## Friday, 24 October 2014

### FORCE = MASS X ACCELERATION

Directions: On this worksheet, positive horizontal directions are towards the right and positive vertical directions are upwards.
 Question 1  What is the net force acting on a 7-kg mass if it is accelerating at a rate of 5 m/sec2? Question 2  What is the magnitude of the frictional force present if a 7-kg mass being pulled by a horizontal force of 5 newtons towards the right experiences an acceleration of -2.29 m/sec2? 3.12 x 10-1 nts 3.06 x 100 nts 2.1 x 101 nts 1.6 x 101 nts

Question 3  A 7-kg mass experiences two vertical forces: 62.6 newtons pulling upward and 68.6 newtons pulling downward. What acceleration does the 7-kg mass undergo? -0.9 m/sec2 6.0 m/sec2 1.0 m/sec2 18.7 m/sec2

Question 4  A 7-kg mass is being pulled towards the right with a rope that has a tension of 35 newtons at an angle of 29 degrees to the x-axis. If the surface is frictionless, what acceleration will the mass develop? 2.4 m/sec2 5.0 m/sec2 1.9 m/sec2 4.4 m/sec2

Question 5  A 10-gram bullet travelling at 40 m/sec is fired into a tree. If the bullet is brought to a stop in a distance of 29 centimeters, what average resistive force did the tree exert upon it? -1.38 x 100 nts -2.76 x 101 nts -2.76 x 102 nts -4 x 10-1 nts