Is RGIS good to work with?

For those good at physics can you check over my work to see if it's right?

• All of the following are examples of simple machines EXCEPT A) Inclined plane B) Wedge C) Scissors D) Pulley 2. How can a machine make work easier for you? A) By decreasing the amount of work you do B) By changing the direction of your force C) By increasing the work done by the machine D) None of the above 3. Doing work at a faster rate requires A) less power. B) more power. C) more time. D) more force. 4. How can you make the work output of a machine greater than the work input? A) By decreasing friction B) By increasing the input force C) By increasing the output distance D) None of the above 5. Why is a jack used to lift a car considered to be a machine? A) It decreases the efficiency of the work because it makes lifting a car more difficult. B) It decreases the efficiency of the work because it is a heavy piece of machinery. C) It increases the efficiency of the work by decreasing the force applied to the car. D) It increases the efficiency of the work by increasing the force used to lift the car. 6. A(n) __________ is an example of an inclined plane, which is a simple machine. A) axe B) screwdriver C) ramp D) crowbar 7. In which of the following is no work done? A) Climbing stairs B) Lifting a book C) Pushing a shopping cart D) Holding a book still in your hand 8. If the work done decreases, while force remains constant, the distance the object moved A) increased. B) decreased. C) remained constant. D) doubled. 9. By changing the distance over which a force acts, a machine A) increase the efficiency of work. B) decrease the efficiency of work. C) does not change the efficiency of work. D) makes work more difficult to complete. 10. Power is calculated by dividing __________ by __________. A) the amount of work done; the time needed to do the work B) the time needed to do the work; the amount of work done C) the force required to do the work; the time needed to do the work D) the number of joules; the number of hours needed to do the work 11. If the force acting in the direction of motion is increased while the distance that the object moves remains constant, the amount of work done A) increases. B) decreases. C) remains constant. D) is reduced by half. 12. Reducing friction in a machine A) decreases its actual mechanical advantage. B) decreases the work output. C) increases its efficiency. D) increases its ideal mechanical advantage. 13. A force acting on an object does no work if A) a machine is used to move the object. B) the force is not in the direction of the object’s motion. C) the force is greater than the force of friction. D) the object accelerates. 14. A machine does which of the following? A) Makes work more difficult to do B) Changes the size of a force needed C) Removes the force you exert D) Keeps distance over which a force acts constant 15. All of the following are examples of compound machines EXCEPT A) Automobile B) Screw C) Clock D) Washing machine 16. Which of the following statements is true? A) To increase power, you can decrease the amount of work you do in a given amount of time, or you can do a given amount of work in less time. B) To increase power, you can decrease the amount of work you do in a given amount of time, or you can do a given amount of work in more time. C) To increase power, you can increase the amount of work you do in a given amount of time, or you can do a given amount of work in less time. D) To increase power, you can increase the amount of work you do in a given amount of time, or you can do a given amount of work in more time. 17. A machine is classified as a compound machine if it A) has moving parts. B) has an IMA greater than one. C) is made up of two or more simple machines that operate together. D) is very efficient. 18. The power of a machine measures A) its rate of doing work. B) its strength. C) the force it produces. D) the work it does. 19. Which simple machine consists of a rope that fits into a groove in a wheel? A) Lever B) Wheel and axle C) Wedge D) Pulley 20. If the amount of work done increases while time remains constant, power will A) increase. B) decrease. C) decrease by half. D) remain constant. 21. Work is calculated by multiplying the constant force acting in the direction of motion by the __________ that the object moves. A) distance B) joules C) time D) variable force 22. Work is done when a __________ acts on an object in the __________ the object moves. A) distance; force B) force; vector C) force; direction D) vector; force 23. Why is a bicycle considered to be a compound machine? A) It has wheels to help it move quickly. B) It uses an inclined plane. C) It is made up of more than one simple machine. D) It uses a lever to help it operate. C,C,D,D,D,C,D,B,B,C,A

• Answer:

  I think it a bit inconsiderate to post something of this length. The answer to 23) is C. Same for 22. While 21 is (A) and that is all I can see, so I'm going to bed.