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LET'S CHECKI 3rd: effort d. 2nd, effort A. Choose the letter of the correct answer. 1. The wheelbarrow is a is in the middle of the class lever because the two other important points. 1st fulcrum b. 2nd: load 2. Will it be possible for a girl in a seesaw to balance herself with her father who weighs twice as much as her? Why? Yes. She'll have to sit nearer the fulcrum than her father. b. Yes. Her father will have to sit nearer the fulcrum than her No. She needs to be as heavy as her father. d No. She needs to be heavier than her father. 3. A can opener is a combination of which simple machines? a lever and a wedge b. a wedge and a screw a lever and an inclined plane d. an inclined plane and a wedge a. C. 4. How much force is needed in going up a less steep incline? a. less; longer b. less; shorter d more; longer C. more; shorter 5. A screw is a special kind of what simple machine? a. lever c. inclined plane b. wedge d. wheel and axle
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