A block sliding up a ramp, solve for acceleration

In summary, the block sliding up a 50 degree ramp with an initial speed of 9m/s and a coefficient of kinetic friction of 0.51 will experience an acceleration of -3.829 m/s^2. To find this acceleration, the equations Fk = (Fn)uk and F=ma were used, along with the components of weight and frictional force.
  • #1
acid234
1
0

Homework Statement


A block is sent sliding up a 50 degree ramp at an initial speed of 9m/s. The coefficient of kinetic friction between the ramp and the block is 0.51. Find the acceleration of the block.

Homework Equations


Fk = (Fn)uk
F=ma

The Attempt at a Solution


umgsin50 = ma
ugsin50 = a
0.51(-9.8)sin50 = a
a = -3.829

Which is far from the right answer.
 
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  • #2
gravity! Think about if the block wasn't initially moving, would you know how to calculate its downward acceleration from gravity alone? The friction portion seems to be correct though.
 
  • #3
Hi acid234, welcome to PF.
On the inclined plane, the retardation is caused by two factors. 1) Component of the weight along the inclined plane and 2) the frictional force. Find them
 

1. What is the formula for calculating acceleration in this scenario?

The formula for calculating acceleration in this scenario is a = gsinθ, where "a" is the acceleration, "g" is the acceleration due to gravity (9.8 m/s²), and θ is the angle of the ramp.

2. How does the mass of the block affect the acceleration?

The mass of the block does not affect the acceleration in this scenario. According to Newton's Second Law of Motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In this case, the net force is the component of the force of gravity acting down the ramp, which remains constant regardless of the block's mass.

3. How do you determine the angle of the ramp?

The angle of the ramp can be determined by using the trigonometric function tangent (tan). The tangent of the angle is equal to the opposite side (height of the ramp) divided by the adjacent side (length of the ramp). Therefore, the angle can be found by taking the inverse tangent (arctan) of the ratio of height to length.

4. Can you use this formula for any type of ramp?

Yes, this formula can be used for any type of ramp as long as the angle (θ) is known. However, it is important to note that the acceleration may vary if the ramp is not frictionless.

5. How does the acceleration change if the ramp is not frictionless?

If the ramp is not frictionless, the acceleration will be less than the calculated value. This is because friction acts in the opposite direction of motion, reducing the net force and therefore the acceleration. The magnitude of this decrease in acceleration depends on the coefficient of friction between the block and the ramp.

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