Pulleys, gears, and other wheels p.81

Pulleys, gears, and other wheels p.81

1) To make a pulley system you need a pulley, a wheel, and a rope.

2) He can lift the engine up by pulling down on the rope, and it is easier because he can also lift it by using a far smaller force.

3) a. when the pedal is pushed the chain passes on the force to the back wheels turning them.

b. the gears change the number of times that a turn of the crankshaft turns the back wheel.

4. The difference between cycling in high gear and low gear is that when you are driving on a flat road you put the bike on high gear and when you are climbing a hill you are driving on low gear because more force needed.