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Updated 12.7.2011

Extra Chapter 4 Problems (.pdf)

Thursday, November 4

  • 1st
  • Projectiles Lab due
  • Intro. to Chapter 4
  • Newton's 1st and 2nd laws of motion
  • Comparing force and mass; S.I. & B.E.S. and their units
  • *The four fundamental forces
  • Defining weight as a special case of force
  • 5th/6th
  • Projectiles Lab due
  • Intro. to Chapter 4
  • Newton's 1st and 2nd laws of motion
  • Comparing force and mass; S.I. & B.E.S. and their units
  • *The four fundamental forces
  • Defining weight as a special case of force
  • 7th
  • Projectiles Lab due
  • The four fundamental forces
  • Defining weight as a special case of force

Friday, November 5

  • 1st
  • The four fundamental forces
  • Calculating weight on Earth and Moon, etc.
  • 5th
  • The four fundamental forces
  • Calculating weight on Earth and Moon, etc.
  • 7th
  • Newton's second law
  • Calculating weight on Earth and Moon.

Monday, November 8

  • 1st/2nd
  • Balanced and unbalanced forces, resistive forces, net force and equilibrium
  • Example: A 3200 kg truck undergoes acceleration from an 6000 N force from the engine. What is its acceleration rate? How much time to accelerate to 29 m/s (about 65 mph)? What about if it has 1000 kg of cargo aboard? What if 250 N of friction exists?
  • A 43 kg boy pushes horizontally on the ground with a force of 82 N. A frictional force of 3 N exists. What is the boy's acceleration rate?
  • *Equilibrium with the bird on a wire problem
  • More examples of balanced and unbalanced force problems
  • 5th/6th
  • Balanced and unbalanced forces, resistive forces, net force and equilibrium
  • Example: A 3200 kg truck undergoes acceleration from an 6000 N force from the engine. What is its acceleration rate? How much time to accelerate to 29 m/s (about 65 mph)? What about if it has 1000 kg of cargo aboard? What if 250 N of friction exists?
  • A 43 kg boy pushes horizontally on the ground with a force of 82 N. A frictional force of 3 N exists. What is the boy's acceleration rate?
  • *Equilibrium with the bird on a wire problem
  • More examples of balanced and unbalanced force problems
  • 7th
  • Calculating weight on Earth and Moon, etc.
  • Balanced and unbalanced forces, resistive forces, net force and equilibrium
  • Example: A 3200 kg truck undergoes acceleration from an 6000 N force from the engine. What is its acceleration rate? How much time to accelerate to 29 m/s (about 65 mph)? What about if it has 1000 kg of cargo aboard? What if 250 N of friction exists?
  • A 43 kg boy pushes horizontally on the ground with a force of 82 N. A frictional force of 3 N exists. What is the boy's acceleration rate?

Tuesday, November 9

  • 1st/2nd
  • P. 109; 1-2, 5-7, 11 due
  • Go over problems
  • *Two people pull on ropes connected to a 520 N crate. They each pull with a force of 130 N but are pulling 30° from the centerline of motion. What is the acceleration rate of the crate? What if a friction force of 220 N exists? What if the friction force is 80 N?
  • 5th/6th
  • P. 109; 1-2, 5-7, 11 due
  • Go over problems
  • *Two people pull on ropes connected to a 520 N crate. They each pull with a force of 130 N but are pulling 30° from the centerline of motion. What is the acceleration rate of the crate? What if a friction force of 220 N exists? What if the friction force is 80 N?
  • 7th
  • P. 109; 1-2, 5-7, 11 due
  • Go over problems
  • Equilibrium with the bird on a wire problem
  • Two people pull on ropes connected to a 520 N crate. They each pull with a force of 130 N but are pulling 30° from the centerline of motion. What is the acceleration rate of the crate? What if a friction force of 220 N exists? What if the friction force is 80 N?

Thursday, November 10 and Friday, November 11 – No School – Parent/Teacher conferences

Monday, November 14

  • P. 109; 15 to 20 due
  • Collect problems
  • Work on Force Lab

Tuesday, November 15

  • Intro. to friction and the friction lab
  • Friction formula and its values
  • *Finish force lab data collection and analysis
  • Collection friction lab data

Wednesday, November 16

  • Return and review problems from last week
  • *Inclined plane
  • Atwood machine

Thursday, November 17

  • 1st
  • Some more examples: A 55 kg box is pulled along with a force of 70 N by a rope that makes a 40° angle with the horizontal. How fast is the box moving after 2.0 s if it starts at rest? What if the coefficient of friction is 0.2? (How much more force is required to make it move at constant speed?
  • A 40 kg lawnmower is pushed along the ground at a constant speed. The person pushes on the handle with an angle of 45° and a force of 200 N. Calculate the coefficient of friction.
  • Work on problems
  • 5th
  • Some more examples: A 55 kg box is pulled along with a force of 70 N by a rope that makes a 40° angle with the horizontal. How fast is the box moving after 2.0 s if it starts at rest? What if the coefficient of friction is 0.2? (How much more force is required to make it move at constant speed?
  • A 40 kg lawnmower is pushed along the ground at a constant speed. The person pushes on the handle with an angle of 45° and a force of 200 N. Calculate the coefficient of friction.
  • Work on problems
  • 6th/7th
  • Some more examples: A 55 kg box is pulled along with a force of 70 N by a rope that makes a 40° angle with the horizontal. How fast is the box moving after 2.0 s if it starts at rest? What if the coefficient of friction is 0.2? (How much more force is required to make it move at constant speed?
  • A 40 kg lawnmower is pushed along the ground at a constant speed. The person pushes on the handle with an angle of 45° and a force of 200 N. Calculate the coefficient of friction.
  • Work on problems

Friday, November 18

  • P. 111; 24–26, 29–31 due
  • Friction on an inclined plane
  • A 15 kg crate resting on a 35° ramp has a static coefficient of friction of 0.40 and a kinetic coefficient of friction of 0.35. Calculate:
    • Minimum force to keep it from moving
    • Force needed to move it up the ramp at constant speed
    • Force needed to move it down the ramp at constant speed
    • What if we want to move it 2.2 m up the ramp in 4.5 s?

Monday, November 21

  • Force Lab due
  • Collection Friction Lab data
  • *Atwood's machine
  • Forces on an inclined plane

Tuesday, November 22

  • P. 112, 35-38 due

Wednesday, November 23

  • Extra lab time
  • Work on homework and lab

Thursday, November 24 through Monday, November 28 – No School – Thanksgiving Break

Wednesday, November 30

  • P. 112, 39-42 due
  • Friction on an inclined plane problem where mu=tan theta and limiting angle of repose
  • Ratio of a/g is mu for flat surfaces...

Thursday, December 1

  • Work on problems

Friday, December 2

  • Chapter 4 Problems due

Monday, December 5

  • Work on review
  • More example problems

Tuesday, December 6

  • Chapter 4 Review
  • Go over solutions
  • What does mu depend on?

Wednesday, December 7

  • Chapter 4 Test

Thursday, December 8

  • Friction Lab due