Tech 2 Blizzard Bag # 3 Due March 6.
On a computer go to the website
http://aspire.cosmic-ray.org/Labs/Machines/
Wheel and Axle Activity.
1.
According to the introduction, what is a screw?
2. If this screw turns 3 cm to the left, how high will it lift the object?
3. How do you predict the force applied to the resistance compares to the force you must apply to the screw?
Complete the Screw and Axle activity and complete the table.
Data Collection
Table 1: The Screw and Axle
Wheel
Radius
100
100
100
100
100
Wheel
Radius
85
85
85
85
85
# of
threads
3
4
5
6
7
# of
threads
3
4
5
6
7
Force
required (N)
Force
required
Distance (m) Wheel Radius
Distance
(m)
70
70
70
70
70
Wheel Radius
55
55
55
55
55
Graph 1: Wheel Radius of 100. (Be sure to label graph)
# of
threads
3
4
5
6
7
# of
threads
3
4
5
6
7
Force required (N)
Distance (m)
Force required
Distance
(m)
Graph 2: Wheel Radius of 55. (Be sure to label graph)
Analysis Questions
1. As the number of threads per centimeter increases, what happens to the distance the wheel is turned to lift the
gate?
2. As the number of threads per centimeters increases, what happens to the amount of force needed to turn the
wheel?
Graph 3: Use data for 5 Threads per centimeter.
1. What happens to the effort force as the radius increases?
2. Why do you think they used a Wheel instead of a screwdriver to turn the screw?