# Glencoe Physical Science

## Chapter 5: Work and Machines

### Work and Machines

 1 Which of the following tools is a wedge? Need a Hint? A) screw B) bottle opener C) wheelbarrow D) knife 2 When work is done, there is always a(n) __________. Need a Hint? A) single movement involved B) transfer of energy C) increase in the mechanical advantage D) constant rate 3 Which of the following equations should be used to calculate work done? Need a Hint? A) W = F/d B) W = F X a C) W = m X d D) W = F X d 4 Which of the following equations should be used to calculate power? Need a Hint? A) P = W/t B) P = W X t C) P = F/t D) P = m X a 5 Which of the following describes a first-class lever? Need a Hint? A) effort force located between the resistance force and fulcrum B) resistance force located between the effort force and fulcrum C) effort force and resistance force in same location D) fulcrum located between the effort and resistance forces 6 A __________ is a modified form of the wheel and axle that has two wheels of different sizes with interlocking teeth. Need a Hint? A) wheelbarrow B) pulley C) gear D) screw 7 A lever is an example of a machine that __________. Need a Hint? A) increases the distance an object moves B) decreases the work required to move an object C) is complex and has many moving parts D) increases the force applied to an object 8 A(n) __________ is a bar that is free to pivot about a fixed point. Need a Hint? A) screw B) lever C) pulley D) inclined plane 9 __________ is the rate at which work is done. Need a Hint? A) Force B) Power C) Efficiency D) Effort 10 A(n) __________ is a grooved wheel with a rope, chain or cable running along the groove. Need a Hint? A) pulley B) screw C) wedge D) axle 11 To calculate the ideal mechanical advantage of a lever, __________. Need a Hint? A) divide the length of the effort arm by the length of the resistance arm B) divide the length of the resistance arm by the length of the effort arm C) add the lengths of the effort arm and the resistance arm D) multiply the length of the effort arm by the length of the resistance arm 12 A watt is equal to __________. Need a Hint? A) one meter per second B) one newton per second C) one joule per second D) one newton-meter 13 Which of the following equations should be used to calculate power if work is not done? Need a Hint? A) Power cannot be measured if work is not done. B) P = E/t C) P = E X t D) P = F/t 14 How does a ramp make it easier to move a heavy object a certain distance? Need a Hint? A) by decreasing the distance the object moves B) by decreasing the amount of work required to move the object C) by changing the direction in which the object moves D) by decreasing the amount of force required to move the object 15 If you apply a force of 10 N to a box and push it 10 m in 10 s, how much power did you deliver? Need a Hint? A) 100 W B) 30 W C) 1 000 W D) 10 W 16 Which of the following simple machines is an inclined plane wrapped around a post? Need a Hint? A) screw B) wedge C) lever D) wheel 17 A(n) __________ is a simple machine that consists of two wheels that rotate together. Need a Hint? A) movable pulley B) hand-operated can opener C) wheel and axle D) inclined plane 18 In which of the following situations do your arms do work on books? Need a Hint? A) holding a heavy stack of books while standing B) carrying a heavy stack of books C) picking up a pile of books from the floor D) dropping a stack of books onto a table 19 __________ is the transfer of energy that occurs when a force makes an object move. Need a Hint? A) Work B) Power C) Effort D) Resistance 20 If a pulley is attached to something that doesn't move, what is it called? Need a Hint? A) moveable B) stuck C) fixed D) block and tackle
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