Example: A machine drives a ball giving the ball an initial horizontal speed of
. What is the magnitude of the average force exerted on the ball if the force is exerted over
?
Known:
Find:
Relevant Equation:
*Note that if you hold Impulse constant, an increase in means a decrease in
. The reverse is true. For instance, a car accelerates to a speed of 60 mpg. I can get to this speed in 30 seconds out. If you want it to be faster than that, say reach 60 mph in 5 seconds, you need a lot more force to be exerted each second. Same principle here.
Remember that Impulse can be replaced with a change in moments.
Solve for →
Plug in values and solve: