Simple block kinematics problem

In summary, this conversation discusses a problem involving a block with a weight of 75lbf and coefficients of static and kinematic friction of 0.50. The problem asks to determine the acceleration of the block under the influence of a 25 lbf force at velocities of 8fps up the plane, 15fps down the plane, and zero velocity. The relevant equation is the sum of all forces equaling mass times acceleration. The given information includes the cosine and sine of an angle, but it is unclear which angle is being referred to.
  • #1
jean28
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0

Homework Statement



Block A weighs 75lbf and the coefficients of static and kinematic friction between A and the plane are both 0.50. Determine the acceleration of A under the action of the 25 lbf force when the velocity at A is (a) 8fps up the plane, (b) 15 fps down the plane. (c) Zero.

Homework Equations



Sum of all forces = mass * acceleration

The Attempt at a Solution



I don't know where to start... the box is doing up a plane and it's cosine is 4/5 and its sine is 3/5.
 
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  • #2
"Its cosine is 4/5 and its sine is 3/5". What is "its"?? Yes, I understand it is an angle but with the horizontal or vertical?
 

FAQ: Simple block kinematics problem

What is a simple block kinematics problem?

A simple block kinematics problem is a type of physics problem that involves analyzing the motion of a block, typically on a flat surface, using the principles of kinematics. This type of problem often requires solving for variables such as displacement, velocity, and acceleration.

How do you solve a simple block kinematics problem?

To solve a simple block kinematics problem, you will need to identify the given information and determine which kinematic equations are relevant to the problem. Then, you can use algebraic manipulation to solve for the unknown variables.

What are the key principles of kinematics?

The key principles of kinematics include displacement, velocity, and acceleration. These quantities are related through kinematic equations, which describe the motion of an object without considering the forces acting on it.

What are some common variables in a simple block kinematics problem?

Some common variables in a simple block kinematics problem include initial and final displacement, initial and final velocity, acceleration, and time. These variables are often represented by the symbols d, v0, v, a, and t, respectively.

Why are simple block kinematics problems important?

Simple block kinematics problems are important because they allow us to understand and predict the motion of objects without considering the complexities of forces. They also help us develop problem-solving skills and gain a deeper understanding of the basic principles of physics.

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