Gears, pulleys, and chain and sprockets.

Why do you think oil is put on the chains of bicycles?

• a) The oil reduces the friction, which makes it easier to ride.

• b) Oil makes the sprocket shine

• c) The chains rub against the sprockets, which would cause both of them to wear down over time.

• Both A and C

There are 13 gears. If the driver gear goes clockwise, which way will the last gear turn?

• Clockwise

• Counterclockwise

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Speed and torque have a(n) _________ relationship.

• Parallel
• Inverse 
• Identical
• Mirror

When you turn pulley A clockwise, what direction will pulley D turn?

• Clockwise.

• Counter clockwise.

• It will get faster.

• It will not move.

Tags

NGSS.MS-PS2-1

When two gears are touching the are ______?

• combined

• meshed

• connected

• intergrated

Tags

NGSS.MS-PS2-1

If the small gear is driving the large gear, what is happening to the torque?

• Increase
• Decrease
• Remains constant
• Not enough information

True or false; both speed and torque can increase at the same time.

• true
• false
• not enough information

What is the difference between Gear Ratios and Mechanical Advantages?

• Mechanical Advantages use torque, Gear Ratios use force

• Mechanical Advantages use force, Gear Ratios use torque

• There is no difference, they are interchangeable

• Mechanical Advantages use gravity, Gear Ratios use friction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The more teeth that there are on the second gear, the less it turns.

• True

• False

A mountain bike has a sprocket and chain drive system designed to adjust the force needed by an operator. The system consists of one sprocket driven by the pedals with a diameter of 10 inches, and a second on the back wheel with a diameter of 6.5 inches. What is the overall system gear ratio?

• 1.53:1

• 0.65:1