Introduction Our problem was _____. Our hypothesis was ______. Our data supported our hypothesis. In our 2nd graph, it shows that as MA decreases, the force increases. According to the text by Edward Zobel, he states that when the height of the ramp increases, the force needed to lift the block also increases. Zobel states that “The greater the mechanical advantage of a machine, the smaller the amount of force we need to accomplish a task”. My experiment agrees with what the text states. My future question would be “How would changing the ramp’s surface affect the force needed to lift the block?”
Problem How will increasing the height of the ramp (IV) affect the force needed to lift the block (DV)?
Hypothesis We think that increasing the height of the ramp (IV) will increase the force needed to lift the block (DV).
Procedure 1. Place the zero side of the meter stick on the desk. 2. Measure the height of Ramp A (second meter stick) to 10cm of first meter stick. (Hold it with your hand). 3. Pull block slowly up the ramp with spring scale and measure the force in Newtons. 4. Measure the length of the meter stick (Ramp A). 5. Change the height of ramp to 30, 50, 70, and 90cm. 6. Repeat steps 2 - 4. 7. Calculate the MA of the ramp using the formula MA = L / H.
100 cm
10 cm
10.0 cm
0.5 N
100 cm
30 cm
3.3 cm
1.0 N
100 cm
50 cm
2.0 cm
1.5 N
100 cm
70 cm
1.4 cm
2.0 N
100 cm
90 cm
1.1 cm
2.5 N
Mechanical advantage of ramp =
length of ramp height of ramp
Ramp A
Ramp D
MAA = L ÷ H
MAD = L ÷ H
MAA =
cm ÷
MAA =
cm
cm
MAD =
cm ÷
MAD =
cm
Ramp B
Ramp E
MAB = L ÷ H
MAE = L ÷ H
MAB =
cm ÷
MAB =
cm
cm
Ramp C MAC = L ÷ H MAC =
cm ÷
MAC =
cm
cm
MAE =
cm ÷
MAE =
cm
cm
cm
The effect of force on the force needed to lift the block
y 4.7 3.5
Force needed to lift the block (in cm)
3.0 2.8
.
2.0 1.1
.
1.0
.
.
.
0.5
x 10
30 40
50
70 80 90 100
Length of Ramp (in N)
4.0
y
The effect of height of the ramp on the force needed to lift the block
3.5 3.0
Force needed 2.5 to lift 2.0 the 1.5 block (in N) 1.0
A
0.5
.
B .
C .
D .
E .
x 10 20 30 40
50 60 70 80 90 100
Height of Ramp (in cm)
4.0
y
The effect of MA on the force needed to lift the block
3.5 3.0
Force needed 2.5 to lift 2.0 the 1.5 block (in N)
E .
D . C . .B
1.0
A .
0.5
x 1
2
3
4
5
6
7
MA (in cm)
8
9
10
Our hypothesis was (insert your hypothesis here). The hypothesis was (CHOOSE ONE: supported OR not supported) by the data. According to the data, in Ramp A when x was ___cm, y was ___N. Then in Ramp B, when x increased to ___cm, y increased to ___N. For Ramp C, when x was ___cm, y was ___N. For Ramp D, x was ___cm, y was ____N. Finally for Ramp E, x was ___cm, y increased to ___N. Therefore, this shows that (insert the main idea of what the graph says). According to the second graph, as MA decreases, the force needed to lift the block (CHOOSE ONE: increases OR decreases). For ramp A, when x was ___cm, y was ___N. Then in Ramp B, when x was to ___, y was to ___. For Ramp C, when x was ___cm, y was ___N. Finally for Ramp E, x was ___cm, y was ___N. Therefore, this shows that (insert the main idea of what the graph says).
Glossary 1. 2. 3. 4.
Newton - defintion input force - definition inclined plane (ramp) - definition mechanical advantage - definition
Reference Science Explorer, Pearson Prentice Hall, page # Inclined Planes and how they work, Edward Zobel
Ramp A
H = 10 cm
L = 100 cm
Ramp B
H = 30 cm
L = 100 cm
Ramp C
H = 50 cm
Ramp D
H = 70 cm
Ramp E
H = 90 cm
L = 100 cm
L = 100 cm
L = 100 cm