Name:______Chapter 4-6 Newton’s Laws Study Guide: Laboratory Practical Portion KEY You will be launching an air powered rocket safely into the sky. We will study the motion of this projectile as a review of all you have learned about motion. This page must be completed prior to any rocket launching.

This rocket has mass. What is the mass of your rocket? ______kg We will use kilograms so we can use Newtons (N) as the unit of force. 1) What are the base units of a Newton? kg m/s2

2) Use Newton’s 1st law of motion to describe the rocket as it sits on the launch pad. It stays in one spot since it has inertia. An object at rest tends to stay at rest until an outside force (the outside air you pump in!) acts on it.

3) What will need to be applied to the rocket in order to change its motion? A net force

4) According to Newton’s 2nd Law of motion, if you doubled the mass of the rocket but applied the same force, what would happen to the acceleration? The acceleration would be cut in half. Mass and acceleration have an inverse relationship according to the second law.

5) Give the action reaction force pair for the rocket being accelerated upwards. (Hint: read back in the intro to see the type of rocket).

Action: Rocket pushes down on air

Reaction: Air pushes up on rocket

6) Draw Free body diagrams for the rocket right after lift-off, at the peak of its trajectory, and right before it hits the ground. Include air resistance as friction (Ff or Fair). Safety Protocols -Goggles must be worn at all times. -All launch pads must be set up using one of the given launch angle wedges. -Rockets will only be launched when cleared by Mr. Pepo (after that, have at it). -Failure to comply with any of the above directions will result in loss of rocket privileges and failure to enjoy rocket science

High Power Vertical Launch The formula for calculating the velocity of a falling object in a given period of time from the peak of the trajectory is the following: v = gt …for distance, d = ½ gt2 Trial #1 #2 #3

Time (s) Final vertical velocity (m/s) Average vertical velocity_____ Average time (s) ______Show calculations below:

Analysis: 1. Using the average time, calculate the distance your rocket reached in the sky.

2. Name two SOURCES of FORCES in this lab. If you forget, bust out the sources of forces toolsheet!

Air, earth

3. Using your weight equation, please calculate the weight of your rocket. Please give the answer in newtons.

4. If we could quadruple the force by adding more air, what would happen to the acceleration of the rocket? Which law states this relationship?