B. Directions: Write the letter of the correct answer on the blank. 6. The wedge and the screw are different forms of A axle B. inclined plane C. lever D. wheel 7. A pulley at the top of a flagpole is a simple machine that A. gains force B. loses force C. changes direction of force D. changes speed of force 8. Which of the following statements is NOT true about pulleys? A. A movable pulley gives a gain in force. B. A fixed pulley changes the direction of force. C. Combination of two fixed pulleys is used to gain force. D. The block and tackle machine are combination of the two kinds of pulley 9. Which of the following is a second-class lever? A. knife B. seesaw C. shovel D. wheelbarrow 10. Which does not belong to the group? A. ax B. blade C. knife screw

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