1 What type of lever has the fulcrum between the effort and the load? A First-class lever B Second-class lever C Third-class lever D Fourth-class lever
2 What type of lever has the effort between the fulcrum and the load? A First-class lever B Second-class lever C Third-class lever D Fourth-class lever
3 What is the effort arm in a lever? A The distance from the fulcrum to the load B The distance from the fulcrum to the effort C The length of the lever D The weight of the lever
4 What is the load in a lever? A The point where effort is applied B The object being moved or lifted C The pivot point D The force applied
5 What is the advantage of using a compound pulley system? A It changes direction only B It multiplies force significantly C It increases speed D It reduces the load
6 What is the advantage of a movable pulley? A It changes the direction of force B It multiplies the effort force C It increases speed D It reduces friction
8 What is the mechanical advantage of a machine that has no friction? A Less than 1 B Equal to 1 C Greater than 1 D It depends on the machine
11 Which simple machine is used to lift heavy objects with less effort? A Lever B Pulley C Inclined plane D All of the above
12 What is the advantage of using a wedge? A It changes direction B It splits objects C It multiplies speed D It stores energy
13 What is the principle of a simple machine? A It increases work B It makes work easier by changing force or distance C It reduces friction D It eliminates energy loss
14 What is a pulley? A A wheel with a rope or chain B A rigid bar that moves around a pivot C A sloped surface D A screw-like device
15 What is a simple machine? A A tool with many parts B A device that changes the direction or magnitude of a force C A machine that uses electricity D A complex engine
16 Which of the following is an example of a first-class lever in the body? A Your arm lifting an object B Your neck muscles C Your leg muscles D Your jaw
17 What is the mechanical advantage of a machine? A The number of parts in the machine B The ratio of output force to input force C The speed of the machine D The size of the machine
19 What is the function of a simple machine? A To increase the amount of work done B To make work easier C To change the nature of work D To eliminate work
20 What is a wedge? A A simple machine with a pointed edge B A sloped surface C A rigid bar D A wheel
21 What is the fulcrum of a lever? A The point where effort is applied B The object being moved C The pivot point D The force applied
22 What is a movable pulley? A A pulley attached to a fixed support B A pulley that moves with the load C A pulley with multiple wheels D A pulley that changes direction
23 What is the relationship between the length of the effort arm and the mechanical advantage? A Longer effort arm gives greater mechanical advantage B Shorter effort arm gives greater mechanical advantage C Length does not affect mechanical advantage D Only the load arm matters
24 Why do simple machines not reduce the total work done? A Because friction increases work B Because they only change the direction of force C Because they multiply force but not distance D Because work is always the same
25 What is the function of a compound machine? A To use only one simple machine B To combine two or more simple machines C To reduce the need for simple machines D To eliminate work