Reflection on Engineering Design Process

How did you use friction in your design?

If you had more time, what would you change about your design?

The most enjoyable part of the engineering challenge was:

What was most frustrating in the design challenge? Why?

Some challenges faced in working as a team include:

• Communication issues

• Different working styles

• Conflict resolution

• All of the above

If the elf weighs 2 kg. and is traveling at a constant velocity of 0.15 m/s, what would the elf’s momentum be? (Remember momentum = m*v)

• 0.4 kg·m/s
• 1 kg·m/s
• 0.3 kg·m/s
• 0.2 kg·m/s

How would tripling the weight of your sled affect the momentum (assuming the speed remains constant)?

• The momentum would remain the same.

• The momentum would double.

• The momentum would triple.

• The momentum would decrease.

What is the name of the force that acts against the elf’s motion down the slope?

• Friction

• Gravity

• Tension

• Normal force

In the real world, the elf accelerates while sledding down the snow slope because of gravity! Gravity points straight down so only a portion of its acceleration acts in the direction the elf is moving as shown in the diagram. Assuming the elf has a mass of 2 kg., how much force would be needed to stop the elf from sledding down the slope? (Force = mass x acceleration)

• 15 N
• 10 N
• 20 N
• 5 N

The following diagram shows a sled moving along a smooth and frictionless track. Identify the section(s) where the sled will experience unbalanced forces.