Flashcards
Unit 1.3 Wheels, Pulleys and Gears
Flashcards do conjunto (22)
- 1WHEELS, PULLEYS AND GEARS UNIT 1.3OPAL KHAN
- 2What is an axle?An axle is a shaft on which a wheel rotates.
- 3What is a wheel?A wheel is a type of a lever with an axle acting as its fulcrum.
- 4What is a rim?A rim is the outer edge of a wheel.
- 5What is a pulley?A pulley is a wheel with a groove over which a rope or cable can slide.
- 6What is a pulley used for?A pulley is used to change the direction of a force.
- 7How can the force applied be increase?The force applied can be increased by using more than one pulley.
- 8How can a greater mechanical advantage be produced?A greater mechanical advantage can be produced by using a number of pulleys.
- 9What is block and tackle?Block and tackle is a system of two or more pulleys using rope or cable to lift heavy objects.
- 10In older-style machines, what was one wheel connected to another by?In some older-style machines such as lathes, one wheel is connected to another by a rubber belt.
- 11What did the belt do?The belt transfers the spinning motion of the first wheel to the second.
- 12What is one disadvantage with such a system?One disadvantage with such a system is that the belt can slip.
- 13How is this problem avoided?This problem is avoided by using gears, or cogs to transfer the spinning motions.
- 14What are gears?Gears are a wheel with teeth used to turn another gear wheel.
- 15What is the most common type of gears?The most common type of gears are called spur gears.
- 16What is a gear train?A gear train is a system of interconnected gears.
- 17What is the driving gear?The driving gear is the gear that supplies force to another gear.
- 18What is the driven gear?The driven gear is the gear that receives force from a driving gear.
- 19How can a gear be a force multiplier?If the driving gear is smaller than the driven gear, then the combination acts as a force multiplier.
- 20How can a gear be a speed multiplier?If the driving gear is larger than the driven gear then the combination acts as a speed multiplier.
- 21What are some different types of gears?Some different types of gears include:
-Bevel gear
-Worm gear
-Rack and pinion
-Idler gear - 22What is a sprocket?A sprocket is a toothed wheel used to link onto a chain on a bicycle.