PLTW Observing Mechanisms SRS

Which gear is the idler?

• A

• B

• C

• None of them

Movement in a circular motion

• Rotary 
• Oscillating
• Linear
• Reciprocating

Movement that goes back and forth in a straight line

• Rotary
• Linear
• Oscillating
• Reciprocating 

The gear train in which diagram provides more torque?

• A
• B

The input gear has 6 teeth.
The output gear has 48 teeth.  The gear ratio is...

• 1:8
• 8:1
• 6:48

What mechanism is part of this machine?

• Lead Screw

• Rack and Pinion

• Simple Gear train with Idler

• Simple gear train - NO idler

• Worm and Wheel

What happens to speed
when you increase torque?

• Speed Increases
• Speed decreases
• Speed stays the same

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

• Torque is increasing

• Torque is decreasing

• Torque remains constant

• Not enough information to answer the question

What does a 2:1 gear ratio mean?

• For every 1 turn of the input, the output turns 2 times.

• For every 2 turns of the input, the output turns 1 time.

• There are 2 gears on the output and 1 gear on the input.

• There is 1 gear on the output and 2 gears on the input.

What types of motion are seen here?

• linear and reciprocating

• oscillating and reciprocating

• oscillating and rotary

• reciprocating and linear