2 Two forces act on a 6. 00-kg object. One of the forces is 10. 0 N Two forces act on a 6.00-kg object. One of the forces is 10.0 N. If the object accelerates at 2.00 m/s2, what is the greatest possible magnitude of the other force?a. 1.0 Nb. 2.0 Nc Nd N
3 Objective: To understand: Forces and pulleys Free body diagrams Sum of the forcesTensionAccelerationSuccess CriteriaBe able to solve pulley problems
4 Pulley system Set up #1: Equal masses: Draw a diagram: Examine the pulley system.What do you notice?
9 Forces and pulleys Pulley rules: Pulleys only change the direction of the forces.Pulleys are frictionlessThe do not add any force to the system
10 Strings don’t stretch Strings only pull Strings have no mass. The acceleration of one body is the same as the other body only negativeStrings only pullThe direction of the force is always away from the object.Strings have no mass.
11 Steps to solve a pulley problem: Draw a free body diagram of each mass.Sum the forces on each body separatelySolve for acceleration of each body.Set the two accelerations equal and opposite.Solve for TensionRe-substitute to get acceleration
12 m1=4 kgm2=8 kgWhat is the tension?What is the acceleration?