Science Question 4. Posted 21 Mar - Removed 26 Mar @ 1920
On Airman Basics page.
When an increase in speed doubles the kinetic energy of a moving body, its momentum
A. increases, but less than doubles.
B. doubles.
C. more than doubles.
D. depends on factors not stated.
Other choices don’t properly distinguish between the linear speed dependence of momentum and the squaring of speed for Kinetic Energy. Or momentum is given by (p)momentum=(m)mass*(v)velocity, while (K)kinetic energy is given by K=1/2*mv^2. You can see that doubling velocity would double momentum, while it would multiply kinetic energy by four. So to double kinetic energy, momentum would be increased, but not quite doubled. |