Friction A force of 28.0 N is required to start a 3.4 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 28.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic friction? 4) A box is at rest on the floor when you begin pushing on it with a 40 N force. Let the mass be 20 kg, the coefficient of static friction be 0.18, and the coefficient of kinetic friction be 0.11. Does the box move? What is the acceleration? 5) A 250.0 kg crate is being pushed across the floor at a constant speed with a rope that makes an angle of 22.0 to the horizontal. If the force applied is equal to 875 N, what is the coefficient of kinetic friction? 875 N 22.0° 250.0 kg
Friction A force of 28.0 N is required to start a 3.4 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 28.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic friction? 4) A box is at rest on the floor when you begin pushing on it with a 40 N force. Let the mass be 20 kg, the coefficient of static friction be 0.18, and the coefficient of kinetic friction be 0.11. Does the box move? What is the acceleration? 5) A 250.0 kg crate is being pushed across the floor at a constant speed with a rope that makes an angle of 22.0 to the horizontal. If the force applied is equal to 875 N, what is the coefficient of kinetic friction? 875 N 22.0° 250.0 kg
Friction A force of 28.0 N is required to start a 3.4 kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the 28.0 N force continues, the box accelerates at 0.50 m/s2. What is the coefficient of kinetic friction? 4) A box is at rest on the floor when you begin pushing on it with a 40 N force. Let the mass be 20 kg, the coefficient of static friction be 0.18, and the coefficient of kinetic friction be 0.11. Does the box move? What is the acceleration? 5) A 250.0 kg crate is being pushed across the floor at a constant speed with a rope that makes an angle of 22.0 to the horizontal. If the force applied is equal to 875 N, what is the coefficient of kinetic friction? 875 N 22.0° 250.0 kg
I've been having trouble with physics problems involving forces and friction. I can understand the basic formulas (such as F=ma), but it gets too hard for me to understand once friction is introduced, and angles as well. I would love for a good explanation to help me, maybe using the attached problems as a starting point.
Transcribed Image Text:Friction
A force of 28.0 N is required to start a 3.4 kg
box moving across a horizontal concrete
floor. (a) What is the coefficient of static
friction between the box and the floor? (b)
If the 28.0 N force continues, the box
accelerates at 0.50 m/s2. What is the
coefficient of kinetic friction?
Transcribed Image Text:4) A box is at rest on the floor when you begin pushing on it with a 40 N force. Let the
mass be 20 kg, the coefficient of static friction be 0.18, and the coefficient of kinetic
friction be 0.11. Does the box move? What is the acceleration?
5) A 250.0 kg crate is being pushed across the
floor at a constant speed with a rope that
makes an angle of 22.0 to the horizontal. If the
force applied is equal to 875 N, what is the
coefficient of kinetic friction?
875 N
22.0°
250.0 kg
Definition Definition Force that opposes motion when the surface of one item rubs against the surface of another. The unit of force of friction is same as the unit of force.
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