Two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to Student 2. If the force of friction resisting the student's push is 4 N, what is the net force acting on the board? What is allowing the board to overcome the force of friction and slide across the table? A A constant balanced force from student 1 is causing the board to slide across the table. B An unbalanced force from student 1 is causing the board to move across the table Reverse friction allows the board to be affected by the balanced force from the table and slide D Force of friction is allowing the board to move across the table.

When an object, such as a soccer ball or car, moves, the air that the object moves through tries to prevent the motion. The opposing force caused by the air an object moves through is often referred to as air resistance, or drag. A student is designing several experiments to determine what quantities affect how big is the drag force on a moving object. 1. The student hypothesizes that the drag force could be affected by how fast the object is moving (its speed), the object's mass, and the cross-sectional area of the object as it "faces into the wind," as illustrated in the figure. Falling Sphere Falling Brick 25 20 Cross-Section is a Circle 2. From their experiment, a student creates a graph showing how mass affects the drag force on an object. The student also writes a brief statement of what is the best math model (claim) for the data and why (evidence). Question: For the graph, do you agree or disagree with the student's claims and supporting evidence? Why or why not? Graph 3: 0 0…

The 80 kg man pushes on the 120 kg crate with a horizontal force F. The coefficients of static and kinetic friction between the crate and the surface are Us = 0.3 and Uk = 0.2. The coefficients of static and kinetic friction between the man and the surface are Us = 0.8 and Uk = 0.5. a. Calculate the normal force generated by the surface on the man and the crate. b. Using the information from part a, prove that the man will be able to move the crate c. what is the greatest acceleration the man can give the crate?

A rifle with a barrel length of 60 cm fires a 14 g bullet with a horizontal speed of 350 m/s. The bullet strikes a block of wood and penetrates to a depth of 14 cm. You may need to review (Page 131). For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Ready for takeoff. Part A What resistive force (assumed to be constant) does the wood exert on the bullet? Express your answer with the appropriate units. fk = Submit LO Part B μÀ - 11812.5 N Previous Answers Request Answer X Incorrect; Try Again How long does it take the bullet to come to rest after entering the wood? Express your answer with the appropriate units. μA t = 0.000533 ? S ?