A cannonball of 8 kg rests inside a cannon of 100 kg. The cannon is fired and the cannonball moves forward at 80 m/s while the cannon immediately recoils back at 6.4 m/s. Draw an IF chart of the interaction.
Solving IF Practice
Rick and Dmitri are both standing still on roller skates. Rick, who is 73 kg, gives Dmitri a shove. Dmitri, who is 81 kg, is moves 3 m/s. How fast does Rick move backwards after the shove? Use an IF chart to find the solution.
Solving for unknown forces
Let’s say that a shopping cart, with a mass of 6 kg, is pushed from rest across 6 meters of space. After the push, the cart is travelling at 4 m/s. The frictional force on the cart is 3 N. What is the applied force on the cart?
Using Energy Analysis
You are out on a baseball field with your friend Kenny. Kenny is standing 90 meters away from you when you throw a baseball directly up into the air. Kenny estimates that he must tilt his head 40 degrees up from the horizontal to see the ball at its max height. You know that Kenny is 1.9 meters tall. You want to use this information to estimate how fast you initially threw the ball.
A) Determine the max height of the baseball using trig.
B) Draw a LOL diagram for the baseball. One snapshot will occur just after the ball is thrown and the final snapshot will occur at the max height.
C) Use the LOL diagram to derive an expression for the energy transfer.
D) Use the expression to solve for the initial velocity of the baseball.
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