Question

1 a. How does Static Friction work in Velcro?

b. How Sliding Friction work in Velcro?

2. a) How does a moving wheel have both translational and rotational movement?

b) How does an automatic transmission sense when to change gears? How is this determined in a manual transmission vehicle?

c) If you forget to put the lug nuts on a tire and the tire comes off, what does gyroscopic rotation make the tire do?

d) Why would a moving car continue to drive if it lost a wheel?

e) Why do some vehicles have locking hubs to engage 4 wheel drive?

3. You’re a pilot for the Navy. For your airplane to be able to lift itself off the ground, it must be traveling forward with a speed of 208 km/h (130 mph).

a) The force exerted by the jet engine on the airplane causes it to accelerate down the runway. How long must the runway be for the airplane to reach its takeoff speed if the jet accelerates at a rate of 2 mile per second?

b) How does a helicopter fly that allows it to land in a smaller space then a jet?

c) Why do aircraft carriers use more jets than helicopter?

d) What is a sonic boom, and what causes it?

Answer 1