Concept explainers
Compare the free-body diagram for the lower book to the free-body diagram for the same book in part A (i.e., before the upper book was added).
Which of the forces changed when the upper book was added and which remained the same?
As discussed earlier, we think of each force acting on an object as being exerted by another object. The first object a force of equal magnitude and opposite direction on the second object. The two forces together are called an action-reaction or
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- In Figure 1, we depict two boxes and an applied force of magnitude 100.0N. The horizontal floor is frictionless, and box A is more massive thanbox B. Which of the following is correct? (Before you answer this question, draw FBDs and sum forces.)a. Box A pushes on box B with a force of 100 N, and box B pusheson box A with a force of 100 N.b. Box A pushes on box B harder than box B pushes on box A.c. Boxes A and B push on each other with equal forces of less than 100.0N.d. The boxes will not begin to move unless the total weight of the twoboxes is less than 100.0 N.arrow_forwardA person pushes two boxes with a horizontal 100 NN force on a frictionless floor, as shown in the figure (Figure 1). Box AA is heavier than box BB. Which of the following statements about these boxes is correct? Box AA pushes on box BB with a force of 100 NN , and box BB pushes on box AA with a force of 100 NN . Box AA pushes on box BB harder than box BB pushes on box AA . Boxes AA and BB push on each other with equal forces of less than 100 NN . The boxes will not begin to move unless the total weight of the two boxes is less than 100 NN .arrow_forwardA boy standing on a frictionless wooden deck pulls two large wooden blocks that are held together by a rope. From the horizontal with an angle theta, F( F with a vector sign) is the pulling force and the two blocks accelerate. Considering the rope is not able to extend more and doesn't have a mass, a) Sketch the free body diagram if the mass of one block is m1 and the other is m2. b) In relation to F, theta, m1 and m2; determine the magnitude of the tension next to the rope that is connecting the two blocks. c) F = 30N, theta = 35 degrees, m1= 6. 5kg and m2 = 4.8kg, find the magnitude of tension.arrow_forward
- Three boxes, A, B, and C, are placed on a frictionless surface as shown in the diagram below. B A If you push on box A with a force of 8.25 N, find the contact force (in N) between each pair of boxes. Here mA = 7.10 kg, mg = 4.50 kg, and mc = 1.50 kg. contact force between A and B N contact force between B and C Narrow_forwardFind I and J values and please answer all parts of this question 1. Block 1 (3.5 kg) is resting on the surface of a table. On a sheet of paper, draw the free body diagram for block 1 using the two-subscript notation from class. After completing the free body diagram, enter below each force and its x & y-components. (use g = 10 m/s2) Remember that the x-component is the "i" component and the y-component is the "j" component. FORCES on BLOCK 1 Weight force on block 1 by Earth: 100 (two-subscript notation) The Weight on block 1 by the Earth has the notation: W1E. Value = ———i + ——- j N Remember that W1E points down (negative y-value) with a magnitude of m1 * g. Normal force on block 1 by Surface: (two-subscript notation) Value = ——i +——- j Narrow_forwardThe diagram below shows an object of mass m= 20kg being acted upon by a force F=50N at an angle of θ=30o. The coefficient of kinetic friction between the object and the surface is 0.100. Draw a Free Body diagram for the object. Be sure to show all forces as well as the reference x,y axis and by Using Newton’s 2nd law, write the force equations for both the x and the y directions. Write these equations in terms of the letters m, F, θ, FN, g, f (little f stands for the friction force). X-direction: _______________________________________________________________ Y-direction:________________________________________________________________ b) Solve for the Normal Force c)Use your answer from part C to find the frictional force. Please answer all three partsarrow_forward
- A person of mass 65.0 kg is standing on a weighing scale inside an elevator. Three cases are shown below. In Case A, the elevator accelerates upwards, in case B, the elevator accelerates downward and in Case C, the elevator moves up with the constant velocity. In each of the scenarios, A, B, and C: Draw a free body diagram showing all forces on the mass. Make sure to indicate which force is bigger by drawing a vector of larger length. Choose a coordinate system and write Newton’s Second Law in terms of all the forces. The apparent weight of the person corresponds to which force on the person? Calculate the apparent weight of the person if the magnitude of a is 3 m/s2 and the magnitude of v is 4 m/s. In which case is the apparent weight the same as the real weight? Why? In which scenario and value of a, can you feel weightless?arrow_forwardbased on the Atwoods machine. mass 1 is 55 grams and mass 2 is 70 grams Draw a free-Body-Diagram for mass-one. Label the forces. Draw the arrows on one side (one pointing towards the object and the other pointing away from the object. So that it is immediately obvious which force is bigger, and what the direction of the net force is. Draw a free body diagram for mass two. Label the forces. In this case draw the arrows on one side of the mass.arrow_forwardTwo blocks A and B are in contact with each other on a table without friction. A horizontalforce equal to 3 Newtons is applied to block A (the larger block).a) If M_a =4kg and M_b=1 kg Find the magnitude of the force between the blocksb) If now the force is applied to block B (instead of A), what is the force between theblocks?c) Explain in your own words what happened (the results of (a) and (b)arrow_forward
- Which of the statements below does not coincide with the definition of Newton's 3rd Law of Motion? * O Its impossible to exert force without experiencing one. O Action-reaction pairs exist every time forces interact with matter. Forces interacting between two objects are equal in magnitude and opposite direction. O An object at rest may or may not experience action-reaction force pairs.arrow_forwardA block is suspended from a pulley and the tension in the rope is 77.5 N (see figure (a)). In figure (b), the block is pulled at constant velocity. m m (a) (b) Now what is the tension (in N) in the rope? Narrow_forwardTo be clear: You must write the words "Newton's Second Law" and point to an example of it within your solution! Write out the second law using symbols, not numbers. Writing "net force = m a" does not qualify because that could be written for any object. The symbols and subscripts should clearly refer to specific forces in each diagram. Examples, good and bad, of what might qualify are shown below. The following are three examples of Newton's second law written for an object called "E" (which is not in this question). Credit would be given for the first example but not for the second or third. This is a good example: mE g−TEJ sinθ1+NER cosθ2=mE a This is a bad example that is not specific enough: Σ FE=mE a This is a bad example with unspecified numbers and without symbols: (1.7 kg) g−(3.8 N) sin(59∘)+(4.9 N)cos(34∘)=(1.7 kg) a Once you have begun your solution with symbols in Newton's Second Law, you may begin to substitute numbers as needed.arrow_forward
- University Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice University