Types of Collisions 3 Types of Collisions - Weebly

Types of Collisions 3 Types of Collisions: -Inelastic

*Perfectly Inelastic

*Elastic

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Perfectly Inelastic Collision What does it look like?

What is conserved?

Equation:

Elastic Collision What does it look like?

What is conserved? Equations:

Real life Physics: Most collisions aren't elastic or perfectly inelastic. Any time _______ is produced, there is a decrease in ___________. So most collisions are really _________, which means they move separately but lose ______. (We assume elastic or perfectly inelastic to make the math/physics more simple.)

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1. An empty train car moving east at 21 m/s collides with a loaded train car initially at rest that has twice the mass of the empty car. The cars stick together. a. This is a ___________________ collision because _______________________________. b. Find the final velocity of the cars.

c. Find the final speed if the loaded car was moving at 17 m/s and hit the empty car initially at rest.

d. Find the final velocity if the empty car was moving east at 21 m/s and the loaded train was moving west at 6 m/s.

In the previous problem, is KE conserved? How do you know? If it isn't conserved, where does the mechanical energy go?

2. A clay ball with a mass of 0.35 kg is moving to the right at 4.2 m/s and hits a 0.35 kg ball at rest. The balls collide and stick. a. This is a ___________________ collision because _______________________________. b. What is the final speed of the clay balls?

c. Calculate the decrease in KE.

d. What percent of KE is converted to other forms of energy?

3. Two balls collide elastically. The first ball has a mass of 15 g and is moving initially at 3.5 m/s to the right. After the collision, the ball is moving at 5.4 m/s to the left. The second ball has a mass of 22 g and is initially moving to the left at 4 m/s. a. What makes a collision an elastic collision?

b. Find the final velocity of the 22 g ball.

c. Show that the KE is conserved.

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