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Does Mass Influence the Amount of Energy an Object Has?. Experimental Design. How many variables should be different in a controlled experiment? ONE, UNO, 1!!!!! What is this variable called? Independent Variable- The 1 variable that I change, The 1 variable that we are testing.
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Experimental Design • How many variables should be different in a controlled experiment? • ONE, UNO, 1!!!!! • What is this variable called? • Independent Variable- The 1 variable that I change, The 1 variable that we are testing. • So what is it for this lab? • Mass
What variables are we controlling? This means, what could be different in the lab? • Height of the track. • Where the steelie is released from (speed). • Anything else? • All of these are called Controlled Variables.
OK, How will we know if mass is effecting Kinetic Energy? What will we measure? • The distance the tee moves. • This is called the Dependent Variable, because we think that the distance the tee will move depends on the mass that we use.
Distance (cm) Mass (g)
The Answer? • YES!!! • The large mass pushed the tee the furthest distance • As mass increased, the amount of work done also increased • Since both variables increased, mass and work must have a direct relationship
A New Type of Relationship • Mass and work also share a second type of relationship, called a linear relationship. • Compare the distance the tee was pushed by a 10g mass and a 30g mass: • 10g mass pushed tee 22cm • 30g mass pushed tee 68cm
Linear Relationship • As the mass increased by 3 times (20g to 60g) the work done on the tee also increased by 3 times (22cm to 68cm). • This is known as a linear relationship. • On a graph, a linear relationship is shown as a straight line
Linear Relationship • Example # 2 • Compare the distance the tee was pushed by a 20g mass and a 60g mass: • 20g mass pushed tee 27cm • 60g mass pushed tee 88 cm
A New Type of Relationship • As the mass increased by 3 times (20g to 60g) the work done on the tee also increased by 3 times (27cm to 88cm). • This is known as a linear relationship. • On a graph, a linear relationship is shown as a straight line
I thought we were trying to show a relationship between mass and kinetic energy… • The purpose of Lab 1.3 was to determine the type of relationship between mass and KE • We measured mass and work done (the distance the tee was pushed) • How can we relate work to KE?
Linking work and KE • We will use the following mathematical argument to link work and KE: If A = B And B = C Then A = C
Linking Work and KE • As mass of the steelie increased, work done increased (A = B) • More work requires more energy to do the work (B = C) • Therefore, an object with greater mass must have more energy (A = C)