Physics 11

Name: _________________

Efficiency Lab Purpose: To determine the efficiency of simple machines and other devices. Station 1: The Ramp Materials: ramp, wooden block, spring scale, string, meter stick Data and Calculations (Show ALL Work): d: 1.25 m h: 0.45 m mass: 1.00 kg Fp: 4.5 N

d h

Ramp Efficiency: ___________% Questions: 1) Does increasing the mass being pulled up the ramp affect the ramp’s efficiency (within significant figures)? Propose an explanation.

2) Does changing the angle of the ramp affect its efficiency (within significant figures)? Propose an explanation.

Station 2: The Pulley Materials: pulley, string, mass, spring scale, meter stick Data and Calculations (Show ALL Work): d1: 0.80 m d2: 0.40 m mass: 1.00 kg Fp: 5.0 N

d1

d2 Pulley Efficiency: ___________%

Physics 11

Name: _________________

Station 3: Bouncy Ball Materials: bouncy ball, meter stick Data and Calculations (Show ALL Work): h1: 1.00 m h2: 0.85 m

h1 h2

Bouncy Ball Efficiency: ___________% Questions: 1) Why does the ball not bounce up to the same height it is dropped from? 2) What happens to that “lost” energy?

Station 4: Lever Materials: lever, mass, string, spring scale, meter stick Data and Calculations (Show ALL Work): d1: 0.22 m d2: 0.45 m mass: 2.00 kg Fp: 11.2 N

d2 d1

Lever Efficiency: ___________% Question: 1) What is the relationship between the length of the lever arm and the force required to lift the mass?