machines and mechanisms

Open Ended

What is the input force of a bike?

Multiple Choice

Which wheel on a bicycle is moved by the gears when the bike is pedalled?

• The back wheel

• The front wheel

• Both wheels

• Neither wheel

Multiple Choice

Why are bicycles considered an environmentally-friendly way of transportation?

• Because they do not use fuel and do not emit pollution

• Because they are faster than cars

• Because they are expensive to maintain

• Because they can fly

Multiple Select

Which of the following statements are true about pulleys?

• A pulley uses a rope and a wheel.

• Pulleys make it easier to lift heavy loads.

• The wheel in a pulley has a grooved track for the rope.

• Pulleys are only used for lifting objects vertically.

Multiple Choice

What is the main difference between a fixed pulley and a moveable pulley?

• A fixed pulley has a wheel in a fixed location, while a moveable pulley has a wheel that can move.

• A fixed pulley is used only for lifting, while a moveable pulley is used only for pulling.

• A fixed pulley uses two wheels, while a moveable pulley uses one wheel.

• A fixed pulley cannot lift loads, while a moveable pulley can.

Open Ended

Explain how a pulley system makes it easier to lift heavy loads. Use information from the images to support your answer.

Multiple Choice

Which types of gears are used to change both speed and direction?

• Spur gear and bevel gear

• Worm gear and idler gear

• Crown gear and worm gear

• Bevel gear and idler gear

Multiple Choice

If Gear 1 has 32 teeth and Gear 2 has 16 teeth, how many times faster does Gear 2 turn compared to Gear 1?

• Twice as fast

• Half as fast

• The same speed

• Four times as fast

Multiple Choice

Which of the following is an example of rotary motion?

• A car steering wheel

• A train moving on a straight track

• An apple falling from a tree

• A swimmer moving down a lane

Multiple Select

Which of the following are examples of linear motion?

• Roller coaster following a track

• Car steering wheel turning

• Apple falling from a tree

• Swimming down a lane in a pool

Multiple Choice

Which mechanism is used to transform rotary motion into linear motion in a gate, as shown in the example?

• A gear and rack mechanism

• A pulley system

• A belt drive

• A lever system

Multiple Choice

Machines play an important role in society, but what is one environmental impact they can have?

• They can cause pollution

• They always save energy

• They never break down

• They make everything safer