OXFORD INTERNATIONAL SCHOOL
High School Section
Science Department
PHYSICS 11th Grade
Evaluation N°1: Rotation of Rigid Bodies
Group N°: ___
Class: 10 ___
Teachers: Juan Sánchez/Gilberto Campos
Grade: ____/40 Pts
Date: ___/___/___
Final Grade: ____
INSTRUCTIONS: Read each step carefully. Make sure to include all the necessary information in
the lab report (pictures, calculations, graphs, tables, notes). Answer all questions. Numerical values
rounded up to two (2) decimals.
Goals:
In this laboratory assignment, students will develop various scenarios regarding rotational
motion of rigid bodies and observe their analogies with linear movement.
Solve the following scenarios:
1. A cable is wrapped around a drum 80 cm in diameter. How many revolutions of this
drum will cause an object attached to the cable to move a linear distance of 2 m? What
is the angular displacement?
2. A point on the edge of a large wheel of 3 m of radius moves through an angle of 37°.
Find the length of the arc.
3. An electric motor turns at 600 rpm. What is the angular velocity? What is the angular
displacement after 6 s?
4. A bucket is hung from a rope that is wrapped many times around a circular drum of
radius 60 cm. The bucket starts from rest and is lifted to a height of 20 cm in 5 s. How
many revolutions were made by the drum? What was the average angular speed of
the rotating drum?
5. A cylindrical piece of stock 6” in diameter rotates in a lathe at 800 rpm. What is the
linear velocity at the surface of the cylinder?
6. A belt is wrapped around the edge of a pulley that is 40 cm in diameter. The pulley
rotates with a constant angular acceleration of 3.50 rad/s2. At t=0, the rotational
speed is 2 rad/s. What are the angular displacement and angular velocity of the pulley
2 s later?
7. A wheel initially rotates at 6 rps and then undergoes a constant angular acceleration
of 4 rad/s2. What is the angular velocity after 5 s? How many revolutions will the
wheel make?
8. A pulley 320 mm in diameter and rotating initially at 4 rps receives a constant angular
acceleration of 2 rad/s2. What is the linear velocity of a belt around the pulley after 8
s? What is the tangential acceleration of the belt?