#### Track a Tank Shell With a Mirror and Polar Coordinates

Track a Tank Shell With a Mirror and Polar Coordinates If the internet was your online physics textbook, The Slow Mo Guys would be writing a good number of those homework questions.

#### Estimate the Friction Coefficient in That Massive Nascar Pile-Up

All I need is to determine the acceleration of a sliding car and I can get a value for the coefficient of kinetic friction between the tire and the road.

#### Launch an 80,000-Pound Sled off an Aircraft Carrier? Sure!

Since the sled is launched horizontally, the starting vertical velocity is zero meters per second. If I had the height of the flight deck, I could use that and the vertical motion to find the time it takes to hit the water.

#### What Would It Take to Shoot a Cannonball Into Orbit?

The motion of a ball falling on the surface of the Earth is caused by the same interaction as the moon orbiting the Earth. In particular, I want to know the height of the mountain and I want to check the trajectory of the cannon ball paths.

#### How to Deconstruct a Football Tackle With Physics

This says that the total force on an object (or football player) is equal to the rate of change of momentum. I can find that Thompson force by looking at his change in momentum in that same time interval.

#### How to Easily Locate the Accelerometer in an iPhone

Moving in a circle at a constant speed means there is indeed an acceleration.If we have an object moving in a circle, the acceleration is pointed towards the center of the circle and depends on two things: the angular velocity (ω) and the circular radius (r).

#### Blackmore's Lidar Solves Self-Driving Cars’ Need for Speed

But you can only measure where something’s going, and how fast, if you manage to hit it again and again.Blackmore's lidar reads the velocity of the objects it detects: The things moving away from the vehicle are in red, those moving toward it are in blue.

#### Here's How Fast That Jumping Tesla Was Traveling

Boom.Now for some questions.How fast was the car traveling?Normally when I need to find the velocity of an object in a video, I just use my typical video analysis techniques in which I mark the position of the object in each frame.