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4 cards from this section. Quick, good the night before a test.
Define drag force in your own words.
Think about why objects slow down in water or air.
What is lift force?
Consider how airplane wings help them rise.
What does the drag coefficient (Cd) represent?
Remember, Cd is about opposing motion.
True or False: Lift acts parallel to the flow of air or water.
Think about how airplanes take off!
You are conducting a wind tunnel test on a new bicycle design. The frontal area is 0.5 m², the drag coefficient is calculated to be 0.3, and the air density is 1.2 kg/m³. If the bicycle travels at 15 m/s, calculate the drag force experienced.
Make sure to substitute all known values accurately.
A tennis player hits a ball of mass 0.058 kg with a diameter of 0.068 m at a spin rate of 3000 RPM. Calculate the lift force if the lift coefficient is 0.8 and the speed of the ball during play is 20 m/s. Will the ball rise or fall if the weight is 0.57 N?
Calculate the frontal area first, then substitute into the lift formula.
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