Answer all the following questions, show all work and explanations for all questions. Please use the formulas on the Physics Reference Table only such as Ff= uFN, g= Fg/m, a = Fnet/m.

116. An empty wooden crate slides across a warehouse floor. If the crate was filled, the coefficient of kinetic friction between the crate and the floor would (1) decrease (2) increase (3) remain the same 120. Each of the following diagrams shows a different block being pushed to the right by a horizontal force across a horizontal surface at constant velocity. 6kg 2 kg 111. An empty wooden crate slides across a 2 N warehouse floor. If the crate was filled, the magnitude of the force of kinetic friction Polished wood between the crate and the floor would Rough wood (1) decrease (2) increase (3) remain the same 2kg 118. As an object initially at rest on a horizontal surface is set in motion, the magnitude of the force of friction between the object and the surface (1) decreases (2) increases (3) remains the same 119. As a thrown baseball is acted on by air friction, the thermal energy of the ball (1) decreases (2) increases (3) remains the same In which two diagrams is the force of friction the same? Base your answers to questions 121 to 123 on the information below. A force of 10. newtons toward the right is exerted on a wooden crate initially moving to the right on a horizontal wooden floor. The crate weighs 25 newtons. 121. Calculate the magnitude of the force of friction between the crate and the floor. 122. What is the magnitude of the net force acting on the crate? 123. Is the crate accelerating? Explain your answer. 124. The diagram below represents a 10.-newton block sliding at constant speed down a plane that makes an angle of 30. with the horizontal. The magnitude of the frictional force acting on the block is (1) 5.0 N (2) 10. N (3) 49 N (4) 98M