Title
Lab: How Water Rockets Launched Under Different Pressures Affect Their Horizontal Displacements
Research Question
How do different pressures applied to the water rocket affect the rocket’s horizontal displacement?
Background Information
This experiment will be conducted outdoors using water, a bottle, and launching equipment. All three of Newton’s laws will apply to this water rocket lab. The pressure will be measured in pounds per square inch (psi) using the bicycle pump and the horizontal displacement will be measured as the linear distance in meters (m) from the launching site to the location of first impact.
Newton’s First Law states that an object at rest will stay at rest unless acted on by an unbalanced force. When the rocket
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When the bicycle pump is pumped to the appropriate pressure, the release brake will be squeezed, causing the rocket to be released.
Dependent Variable
• The horizontal displacement (in m)
The horizontal displacement will be measured using a tape measure at location of the first impact (the watermark left on the basketball court).
Variable Method Significance
Launching degree (45 degrees) Before each launch, the angle of the launch pad will be locked at 45 degrees (as shown on the launch pad). If the launching degree is not kept constant for each trial, the independent variable will not properly correlate with the dependent variable due to the addition of the second independent variable.
Volume of the water inside the rocket (200 mL) The volume of the water will be first measured using a graduated cylinder and then poured into the rocket. Remaining water inside the rocket after each trial will be poured out completely. The amount of water inside the rocket will affect both the thrust and mass. A constant mass will allow accurate calculation of the correlation between pressure and displacement and will prevent the addition of a second independent
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