Friction Dynamics Physics. #1) Friction of a car A car has a mass of 1700 kg and is located on a level road. Some friction exists in the wheel bearings.

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Presentation transcript:

Friction Dynamics Physics

#1) Friction of a car A car has a mass of 1700 kg and is located on a level road. Some friction exists in the wheel bearings and engine that resist motion. The coefficient of static friction (µ s ) is 0.25, and the coefficient of kinetic friction (µ k ) is 0.15 A. Draw the FBD for a car being pulled horizontally. B. How much force is required to get the car to begin rolling forward? C. How much force is required to keep the car moving at a constant velocity? D. If the car is pulled with a force of 4200N, what is its acceleration? E. Considering that the car begins rolling from rest, what will its velocity be after 20 seconds?

#1) Friction of a car A car has a mass of 1700 kg and is located on a level road. Some friction exists in the wheel bearings and engine that resist motion. The coefficient of static friction (µ s ) is 0.25, and the coefficient of kinetic friction (µ k ) is 0.15 A. Draw the FBD for a car being pulled horizontally. B. How much force is required to get the car to begin rolling forward? C. How much force is required to keep the car moving at a constant velocity? D. If the car is pulled with a force of 4200N, what is its acceleration? E. Considering that the car begins rolling from rest, what will its velocity be after 20 seconds?

#1) Friction of a car A car has a mass of 1700 kg and is located on a level road. Some friction exists in the wheel bearings and engine that resist motion. The coefficient of static friction (µ s ) is 0.25, and the coefficient of kinetic friction (µ k ) is 0.15 A. Draw the FBD for a car being pulled horizontally. B. How much force is required to get the car to begin rolling forward? C. How much force is required to keep the car moving at a constant velocity? D. If the car is pulled with a force of 4200N, what is its acceleration? E. Considering that the car begins rolling from rest, what will its velocity be after 20 seconds?

#1) Friction of a car A car has a mass of 1700 kg and is located on a level road. Some friction exists in the wheel bearings and engine that resist motion. The coefficient of static friction (µ s ) is 0.25, and the coefficient of kinetic friction (µ k ) is 0.15 A. Draw the FBD for a car being pulled horizontally. B. How much force is required to get the car to begin rolling forward? C. How much force is required to keep the car moving at a constant velocity? D. If the car is pulled with a force of 4200N, what is its acceleration? E. Considering that the car begins rolling from rest, what will its velocity be after 20 seconds?

#1) Internal Friction of a Car A car has a mass of 1700 kg and is located on a level road. Some friction exists in the wheel bearings and engine that resist motion. The coefficient of static friction (µ s ) is 0.25, and the coefficient of kinetic friction (µ k ) is 0.15 A. Draw the FBD for a car being pulled horizontally. B. How much force is required to get the car to begin rolling forward? C. How much force is required to keep the car moving at a constant velocity? D. If the car is pulled with a force of 4200N, what is its acceleration? E. Considering that the car begins rolling from rest, what will its velocity be after 20 seconds?

#2) Sleigh A horse pulls a sleigh with a force of 230N. The total mass of the sleigh, cargo, and passenger is 130kg. A. Draw the FBD for a sleigh being pulled horizontally. B. The coefficient of kinetic friction (µ k ) is 0.1 on snow. What is the acceleration of the sleigh? C. On a different surface, the acceleration is measured to be 0.20 m/s 2. What is the coefficient of kinetic friction? cgg

#2) Sleigh A horse pulls a sleigh with a force of 230N. The total mass of the sleigh, cargo, and passenger is 130kg. A. Draw the FBD for a sleigh being pulled horizontally. B. The coefficient of kinetic friction (µ k ) is 0.1 on snow. What is the acceleration of the sleigh? C. On a different surface, the acceleration is measured to be 0.20 m/s 2. What is the coefficient of kinetic friction? cgg

#2) Sleigh A horse pulls a sleigh with a force of 230N. The total mass of the sleigh, cargo, and passenger is 130kg. A. Draw the FBD for a sleigh being pulled horizontally. B. The coefficient of kinetic friction (µ k ) is 0.1 on snow. What is the acceleration of the sleigh? C. On a different surface, the acceleration is measured to be 0.20 m/s 2. What is the coefficient of kinetic friction? cgg

#3) Moving Furniture A man accelerates a 160 kg couch horizontally at 1 m/s 2. A. Draw the FBD for a couch being pushed horizontally. B. What is the magnitude of the friction force? C. What is the coefficient of kinetic friction? D. What is the magnitude of the pushing force? cgg

#3) Moving Furniture A man accelerates a 160 kg couch horizontally at 1 m/s 2. A. Draw the FBD for a couch being pushed horizontally. B. What is the magnitude of the friction force? C. What is the coefficient of kinetic friction? D. What is the magnitude of the pushing force? cgg

#3) Moving Furniture A man accelerates a 160 kg couch horizontally at 1 m/s 2. A. Draw the FBD for a couch being pushed horizontally. B. What is the magnitude of the friction force? C. What is the coefficient of kinetic friction? D. What is the magnitude of the pushing force? cgg

#3) Moving Furniture A man accelerates a 160 kg couch horizontally at 1 m/s 2. A. Draw the FBD for a couch being pushed horizontally. B. What is the magnitude of the friction force? C. What is the coefficient of kinetic friction? D. What is the magnitude of the pushing force? cgg

Habasit Rossi Ltd Belting Division has developed high friction plastic modular belts for distribution centers, airports, packaging, etc. Consider a mass 15kg package is moving at a constant velocity up the incline. 1.What is the magnitude of the frictional force when the angle of inclination is 25 o ? 1.What is the magnitude of the frictional force when the angle of inclination is 40 o ? 2.What is the magnitude AND direction of the net force?

A 1250kg car is parked on a 25 o incline. What is the magnitude of the friction force holding the car in place?

An 82kg longboarder rides down a 15 o incline. Friction in the wheels is negligible. 1.Find the magnitude of all forces acting on the longboarder. 1.What is the magnitude AND direction of the net force?

A 90kg man rolls down a 20 o incline in a rollersuit. Friction is negligible. 1.What is the magnitude of the normal force? 1.What is the magnitude AND direction of the net force acting on the man?