Αποτελέσματα Αναζήτησης
Statics. For each of the problems below, carefully draw a force diagram of the system before attempting to solve the problem. Determine the tension in each cable in case A and case B. Case A. Determine tension in each cable. (Hint: There is more than one way to define the system.) The cable at left exerts a –30 N force.
Weight is the only force with a convenient direction. Resolve the tensions into their components. State the equilibrium condition along both axes. I suggest working with the horizontal equation first.
Tension is an internal force for the system as a whole, but tension minus the parallel component of the cart's weight is the net force acting on the cart. Apply Newton's second law to the cart by itself. (Let right be the positive direction since that's the direction the cart is accelerating.)
This collection of problem sets and problems target student ability to use vector principles and operations, kinematic equations, and Newton's Laws to solve physics word problems associated with objects moving in two dimensions.
Define normal and tension forces. Apply Newton's laws of motion to solve problems involving a variety of forces. Use trigonometric identities to resolve weight into components. Forces are given many names, such as push, pull, thrust, lift, weight, friction, and tension.
Justification: Treat the 3 blocks as one unit and use the net force to determine that the blocks will have an acceleration of 1 m/s2. The individual tensions can be calculated by writing out a net force equation for the different systems of blocks, and then using the net force to solve for the unknown tension. Solution 2 kg 1 kg 2 N 4 N 5 N 6 N
Since the 4 kg block will accelerate downward the force in the downward direction will exceed the upward force of tension. Therefore the tension will get smaller. (c) To answer the question in part (b) quantitatively, draw free body diagrams for each block separately. Then write down an expression for the net force on each assuming tension
