Experimental Design Lab Quiz

What is friction?

• Friction is the temperature increase caused by two surfaces rubbing together.
• Friction is the energy lost when two surfaces are separated.
• Friction is the force that enhances the motion of two surfaces in contact.
• Friction is the force that slows down or stops the motion of two surfaces.

Match the following

• What you measure/ observe

• Dependent variable

• What your keep the same to make it fair

• independent variable

• What you change or test

• Control

What was the testable question that we explored yesterday?

• How does the size of the person wearing the shoe affect the force needed to move it?

• How does the weight of the shoe affect how fast it moves?

• How does changing the type of shoe affect the force of friction needed to move it?

• How does the color of the shoe affect the friction force?

Tags

NGSS.MS-PS2-2

Select ALL the materials you would need for this experiment:

• Calculator

• Spring scale

• Shoe samples (tennis shoe, athletic shoe, croc)

• Weights to put in shoes

• Stopwatch

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

Select the correct variable type for each part of our experiment: Same spring scale, pulling speed, contact area:

• Independent Variable

• Dependent Variable

• Control Variables

• Testable Question

Select the correct variable type for each part of our experiment: Type of shoe:

• Independent Variabl

• Dependent Variable

• Control Variable

• Testable Question

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

Select the correct variable type for each part of our experiment: Force reading on spring scale (N):

• Independent Variable

• Dependent Variable

• Control Variable

• Testable Question

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

Complete your hypothesis by filling in the blanks: If the type of shoe is more textured, then the force required to move it will (increase or decrease?) because of friction.

Drag and drop the procedures to the correct step!

Step 1: (a)  

Step 2:​ (b)  

Step 3: ​ (c)  

Step 4:​ (d)  

Step 5: ​ (e)  

• Pull at a steady speed
• Read value on the spring scale
• Record the force reading
• Repeat three trials for shoe type
• Attach spring scale to shoe

Based on your data, which best describes your results:

• Types of shoes with textured soles needed less force to pull because the bumps help them slide more easily.

• The results were random and didn't show any clear pattern related to shoe texture.

• Types of shoes with textured soles needed more force to pull because they create more friction with the floor surface.

• All shoe types required the same force because the floor surface was the same for all tests.

Tags

NGSS.MS-PS2-2