: Occurs when one body slides over another.
: Occurs when a body rolls (e.g., a wheel); it is usually much smaller than sliding friction for the same materials. 3. Example Problems (Sufficient Level)
"Sufficient level" problems often require 2–3 steps of calculation, such as finding the mass of an object given the friction force and coefficient, or determining the coefficient of friction from experimental data. Task : A wooden crate with a mass of fizika 7 klass kirik sila treniia dostatochnyi uroven
(mu) is the dimensionless , which depends on the materials and surface quality.
. What force is required to move the crate at a constant speed? : Calculate gravity force: Calculate friction: : Occurs when one body slides over another
Note: For constant speed, the pulling force must equal the friction force. Task : To pull a sled at a constant speed, a force of is applied. Find the coefficient of friction. Solution : 4. Key Takeaways for Kirik's Methodology
is pulled along a horizontal floor. The coefficient of friction is What force is required to move the crate at a constant speed
At the "Sufficient Level," students are expected to move beyond simple definitions to applying formulas and understanding the physical relationships between variables.