# C 1D Collisions PhET Lab

**Topics:**Kinetic energy, Momentum, Classical mechanics

**Pages:**4 (662 words)

**Published:**December 18, 2014

Introduction: When objects move, they have momentum. Momentum, p, is simply the product of an object’s mass (kg) and its velocity (m/s). The unit for momentum, p, is kgm/s. During a collision, an object’s momentum can be transferred to impulse, which is the product of force (N) and time (s) over which the force acts. This allows us to write the momentum-impulse theorem: Procedure: Play with the Sims Physics Motion Collision Lab Work with 1D collisions at this level. Later (AP Physics) you'll use trigonometry to solve 2D collisions. Velocity to the right is positive, left is negative. Check your work in the simulation after you have completed the tables. Important Formulas:

Perfectly Elastic Collisions: To begin a collision: To restart a collision: Take some time to familiarize yourself with the simulation and perfect collisions. Play. Investigate. Learn. Investigate the action of a more-massive attacking object striking a less-massive target object. What happens to the more-massive attacking object? ______________________________________ What happens to the less-massive target object? __________________________________________ Investigate the action of a less-massive attacking object striking a more-massive target object. What happens to the less-massive attacking object? _______________________________________ What happens to the more-massive target object? _________________________________________ Complete the below table without the simulation and check your work in the simulation. m1

m2

v1

v2

ptotal

v1’

v2’

1.20 kg

1.20 kg

+1.50 m/s

-1.80 m/s

-1.80 m/s

2.40 kg

4.80 kg

+1.30 m/s

0.0 m/s

-.433 m/s

2.50 kg

3.90 kg

.850 m/s

11.5 kgm/s

2.68 m/s

5.10 kg

1.00 kg

0.900 m/s

-4.60 m/s

4.60 m/s

KE stands for Kinetic Energy and is measured in joules. Note that kinetic energy is not a vector quantity. Describe the effect of an elastic collision on the total...

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