### Impulse and Work (MBL) Pre-lab Assignment

Your name: _____________________

Please print this page, fill it in, and show it to your TF at the start of your lab session.

Part of this experiment involves impulse - an impulse is a change in momentum produced by applying a net force to an object for a particular time interval. The first simulation shows possible motions for an air-hockey puck that is subject to a net force for half a second.

Which of the motions shows correctly what an air hockey puck would do if it was initially moving in the x-direction, and was then briefly subjected to a net force in the y-direction?

The second part of this experiment involves work, which has units of energy. Consider rolling a cart down an incline. The simulation below shows this situation. In this simulation, energy graphs are plotted as a function of time.

Two curves, showing different kinds on energy, are shown in the graph below the simulation. Identify each.

The red curve is the: | gravitational potential energy | kinetic energy |

The green curve is the: | gravitational potential energy | kinetic energy |

Briefly explain how you know which graph is which.

Assume there is no friction acting. If you added the two curves, what would you get?

a horizontal line | a line that decreases as the object travels down the slope | a line that increases as the object travels down the slope |

If friction was acting on the cart, what would you get if you added the two curves?

a horizontal line | a line that decreases as the object travels down the slope | a line that increases as the object travels down the slope |

Briefly justify your answer: