1. When there is no friction, what is the magnitude of acceleration on the block?

2. With friction, acceleration = 2.49 m/s^2. What is the coefficient of kinetic friction between plane/block?

3. To keep the mass from accelerating, a spring is attached with spring constant k = 167 N/m. What is the coefficient of static friction if the spring must extend at least x = 17 cm from its unstretched length to keep the block from moving down the plane?

4.The spring is replaced with a massless rope that pulls horizontally to prevent the block from moving. What is the tension in the rope?

NOTE: The rope is not parallel to the block, but is completely horizontal!!

5. Now a new block is attached to the first block. The new block is made of a different material and has a coefficient of static friction ? = 0.7. What minimum mass is needed to keep the system from accelerating?

Transcribed Image Text:

✓✓✓456 m₁ A block with mass m₁ = 9.2 kg is on an incline with an angle 0 = 25° with respect to the horizontal. For the first question there is no friction between the incline and the block. ✓✓✓456 m₁ A block with mass m₁ = 9.2 kg is on an incline with an angle 0 = 25° with respect to the horizontal. For the first question there is no friction between the incline and the block.