Lesson: Forces that Resist Motion

In this lesson, we will learn how to compare friction and drag forces, and also explain how the variable drag force on an object results in a terminal velocity.

Video

16:55

Sample Question Videos

  • 05:11
  • 04:51
  • 04:54

Worksheet: 15 Questions • 5 Videos

Q1:

A ball bearing of mass 150 g is dropped into a tube filled with oil. The ball bearing hits the oil’s surface with a vertically downward velocity of 1.5 m/s and after falling through the oil for 1.5 s, the ball bearing’s velocity becomes 6.3 m/s. What vertically upward average drag force does the oil apply to the ball bearing?

Q2:

The shapes (A), (B), (C), (D), and (E) shown in the diagram are the shapes of the surfaces of objects that move through a fluid. The front of each object has the shape shown. All the objects move at the same speed through the same fluid. Which object has the largest drag force acting on it?

Q3:

How much time after the wheel detaches from the airplane does the upward force applied by the air on the wheel equal the weight of the wheel?

What is the magnitude of the upward force applied by the air on the wheel at the instant that the wheel detaches from the airplane?

At what time would the net force on the wheel be equal to the wheel’s weight?

Is the acceleration of the wheel increasing, decreasing, or constant in the first two seconds after the wheel detaches from the airplane?

Is the acceleration of the wheel increasing, decreasing, or constant between 4 and 6 seconds after the wheel detaches from the airplane?

Is the velocity of the wheel increasing, decreasing, or constant between 2 and 4 seconds after the wheel detaches from the airplane?

Is the velocity of the wheel increasing, decreasing, or constant between 6 and 8 seconds after the wheel detaches from the airplane?

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.