1. Inv. 4.4.2 The Efficiency of a Ramp
Question: How do the factors affect the efficiency of a ramp used to raise a cart?
Hypothesis: I feel that changing the (mass, slope, friction) will affect the efficiency of a ramp.
Materials: refer to pg. 143 Nelson Physics 11
Procedure: refer to pg. 144 Nelson Physics 11
Observations:
mass
slope
friction 1 2 3 4 5 6 7
mass of cart + weights, m (kg)
length of ramp, ∆d (m)
height of ramp, ∆h (m)
force parallel to ramp, Fa (N)
work input, Ein (J)
useful energy output, Eout (J)
efficiency (%)
(1)

2. Fa = ? N
∆d = ? m
∆h = ? m
Ein = Fa∆d
Eout = mg∆h

3. Analysis:
(d) (3)
(e) (1)
(f) (1)
Evaluation:
(g) (1)
(h) (1)
(i) (1)
Synthesis:
(j) (1)
4.4 Understanding Concepts
2. (a) (6) (b) (6) (c) (1) (d) (1) (e) (6) (f) (1) (g) (1) (h) (6)
3. (a) (6) (b) (6)
5. (a) (6) (b) (6)