Friction problems

  A 220 Kg crate is pushed horizontally with a force of 700 N. If the coefficient of kinetic friction is 0.20, calculate the acceleration of the crate.   

• 1.02 m/s²
• 1.22 m/s²
• 1.42 m/s²
• 1.62 m/s²

Tags

NGSS.HS-PS2-1

A force of 40.0 N is required to start a 5.0 kg box moving across a horizontal floor.  (a) What is the coefficient of static friction between the box and the floor?   Answer:  (, ) 

• 0.62
• 0.72
• 0.82
• 0.92

 A sled of mass 50 Kg is pulled along snow covered flat ground.  The static friction coefficient is 0.30, and the sliding friction coefficient is 0.10. What does the sled weight? 

• 190 N
• 290 N
• 390 N
• 490 N

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A box is given a push so that it slides across the floor.  How far will it go, given that the coefficient of kinetic friction is 0.20 and the push imparts an initial speed of 4.0 m/s?  

• 2.8 m
• 3.4 m
• 4.1 m
• 5.2 m

Tags

NGSS.HS-PS2-1

  The 40 Kg crate from question 11 is now pulled across the “not so frozen” parking lot.  A force of 100 N is applied at an angle of 30 degrees with the horizontal.  If the acceleration of the crate is now only 1.0 m/s/s, what is the kinetic coefficient of friction? 

• 0.136
• 0.236
• 0.336
• 0.446

Tags

NGSS.HS-PS2-1

A sled of mass 50 Kg is pulled along snow covered flat ground.  The static friction coefficient is 0.30, and the sliding friction coefficient is 0.10. What force will be needed to start the sled moving? 

• 147 N
• 247 N
• 347 N
• 447 N

A sled of mass 50 Kg is pulled along snow covered flat ground.  The static friction coefficient is 0.30, and he sliding friction coefficient is 0.10. What force is needed to keep the sled moving at a constant velocity? 

• 19 N
• 29 N
• 39 N
• 49 N

Tags

NGSS.HS-PS2-1

A sled of mass 50 Kg is pulled along snow covered flat ground.  The static friction coefficient is 0.30, and he sliding friction coefficient is 0.10. Once moving, what total force must be applied to the sled to accelerate it at 3.0 m/s/s? 

• 99N
• 199N
• 299N
• 399N

Tags

NGSS.HS-PS2-1

A force of 40.0 N is required to start a 5.0 kg box moving across a horizontal floor. If the 40.0 N force continues, the box accelerates at 0.70 m/s/s.  What is the coefficient of kinetic friction?

• 0.64
• 0.74
• 0.84
• 0.94

Tags

NGSS.HS-PS2-1