Physical Science Take 10 Week # 5

DAY #1 QUESTION 1 A 2000 kg car is pulling a 1000 kg trailer. The car’s engine exerts a 6000 N force to move the car and the trailer. In addition, the car and the trailer each experience a 1000 N frictional force as they are being pulled, as represented What is the magnitude of the net force on this system? A N B N C N D N

DAY #1 QUESTION 2 The graph below shows the speed of an object during a 10 s time interval. In which of the following time intervals is the speed of the object decreasing? A. between 0 s and 2 s B. between 2 s and 4 s C. between 6 s and 8 s D. between 8 s and 10 s

DAY #1ANSWERS 1. What is the magnitude of the net force on this system? B N 2. In which of the following time intervals is the speed of the object decreasing? D. between 8 s and 10 s

DAY #2 QUESTION 1 A toy cart that has a weight of 10 N moves with a constant velocity of 2 m/s to the right on a horizontal table. Which of the following statements is correct? A. The table exerts a force of 10 N upward on the toy cart. B. The toy cart exerts a force of 10 N upward on the table. C. The toy cart exerts a force of 2 N downward on the table. D. The table exerts a force of 2 N to the right on the toy cart.

DAY #2 QUESTION 2 The diagram below shows a ball moving in a circular path. Which of the following would cause the ball to fly off in a straight-line path? A. decreasing the mass of the ball B. changing the velocity of the ball C. increasing the radius of the ball’s path D. removing the centripetal force on the ball

DAY #2 ANSWERS 1. A toy cart that has a weight of 10 N moves with a constant velocity of 2 m/s to the right on a horizontal table. According to Newton’s laws of motion, which of the following statements is correct? A.The table exerts a force of 10 N upward on the toy cart. 2. Which of the following would cause the ball to fly off in a straight-line path? D. removing the centripetal force on the ball

DAY #3 QUESTIONS 1. Figure 1 is an example of: a) Inclined Plane b) Pulley c) Screw d) Lever Figure 1 2. Which of the following statement is true for Figure 1. a) b is the fulcrum, c is the output force, a is the input force b) b is the output force, c is the fulcrum, a is the input force c) b is the fulcrum, a is the input force, c is the output force. d) b is the output force, a is the fulcrum, c is the input force

DAY #3 ANSWERS 1. Figure 1 is an example of: d) Lever 2. Which of the following statement is true for Figure 1. d) b is the resistance, a is the fulcrum, c is the effort

DAY #4 QUESTIONS 1. A knife is an example of a (an) a) Inclined Plane b) Wedge c) screw d) pulley 2. Decreasing the slant of an inclined plane increases its? a) effort force b) Mechanical Advantage c) Power d) Work output

DAY #4 ANSWERS 1. A knife is an example of a (an) b) Wedge 2. Decreasing the slant of an inclined plane increases its. b) Mechanical Advantage

DAY #5 QUESTIONS 1. The efficiency of a simple machine a) is always more than 100% b) is equal to 100% c) is always 50% d) is always less than 100% 2. If the mechanical advantage of a simple machine is 4, then the a) output force is 4 times the effort b) effort is 4 times the output force c) efficiency is 4% d) the work output is 4 times the input

DAY #5 ANSWERS 1. The efficiency of a simple machine d) is always less than 100% 2. If the mechanical advantage of a simple machine is 4, then the a) output force is 4 times the effort