# Glencoe Science Level Blue

## Chapter 20: Work and Simple Machines

### Work and Simple Machines

 1 A drill bit is an example of which type of machine? Need a Hint? A) screw B) lever C) pulley D) wheel and axle 2 On what point does a lever pivot? Need a Hint? A) the fulcrum B) the arm C) the middle D) the end 3 What is a sign that work is being done? Need a Hint? A) density B) matter C) motion D) mass 4 What happens to the amount of power expended when you are climbing stairs and then climb faster? Need a Hint? A) It increases. B) It stays the same. C) It stops. D) It decreases. 5 A ramp in a building is an example of which machine? Need a Hint? A) wedge B) lever C) inclined plane D) pulley 6 Name the four simple machines. Need a Hint? A) inclined plane, lever, wheel and axle, and pulley B) wedge, lever, pulley, and wheel C) plane, lever, screw, and wedge D) screw, lever, wedge, and plane 7 What does a screw consist of? Need a Hint? A) a wheel and axle in a vertical position B) an inclined plane wrapped around a cylinder C) a wedge wrapped around a pipe D) a lever wrapped around a pole 8 What is the mechanical advantage if 50 J are put in and 200 J are produced? Need a Hint? A) 4 B) 1000 C) 50 D) 200 9 Using an inclined plane allows you to apply __________. Need a Hint? A) no force B) the same force C) a lesser force D) a greater force 10 When you climb stairs and then walk down a hallway, in which direction is the work done? Need a Hint? A) downward B) upward C) along the hallway D) in the opposite direction that you walk 11 Which of the following do you think a wheel and axle is most closely related to? Need a Hint? A) lever B) wedge C) pulley D) inclined plane 12 The efficiency of all machines is __________. Need a Hint? A) more than 100 percent B) exactly 100 percent C) impossible to calculate D) less than 100 percent 13 Using several pulleys together is known as a __________. Need a Hint? A) pulley system B) machine system C) wheel and axle D) pulley group 14 What happens to the total amount of work done when you use a machine compared to not using a machine? Need a Hint? A) It stays the same. B) It goes to zero. C) It decreases. D) It increases. 15 Which simple machines are found on a hammer? Need a Hint? A) wedge and plane B) lever only C) plane and lever D) screw and pulley 16 Which is an example of work being done in a scientific sense? Need a Hint? A) carrying a box B) pushing against a stationary box C) lifting a box D) doing homework 17 A 5,000 N block was lifted 10 m. How much work was done? Need a Hint? A) 50,000 J B) 500 J C) 5,000 J D) 50 J 18 A chisel is an example of which machine? Need a Hint? A) wheel and axle B) wedge C) lever D) pulley 19 What is the scientific formula for work? Need a Hint? A) W = F x d B) W = F + d C) W = F - d D) W = F/d 20 The unit for work is a joule, which is equal to __________. Need a Hint? A) N/m B) N - m C) N + m D) N x m