O'Reilly logo

Fundamentals of Physics by David Halliday, Robert Resnick, Jearl Walker

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

images

images

What physics is responsible for this dangerous compulsion?

The answer is in this chapter.

A jet plane taking off from an aircraft carrier is propelled by its powerful engines while being thrown forward by a catapult mechanism installed in the carrier deck. The resulting high acceleration allows the plane to reach takeoff speed in a short distance on the deck. However, that high acceleration also compels the pilot to angle the plane sharply nose-down as it leaves the deck. Pilots are trained to ignore this compulsion, but occasionally a plane is flown straight into the ocean.

5-1 What Is Physics?

We have seen that part of physics is a study of motion, including accelerations, which are changes in velocities. Physics is also a study of what can cause an object to accelerate. That cause is a force, which is, loosely speaking, a push or pull on the object. The force is said to act on the object to change its velocity. For example, when a dragster accelerates, a force from the track acts on the rear tires to cause the dragster’s acceleration. When a defensive guard knocks down a quarterback, a force from the guard acts on the quarterback to cause the quarterback’s backward acceleration. When a car slams into a telephone pole, a force on the car from the pole causes the car to stop. Science, ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required