1. 2 rocks sliding on a frictionless surface. Given the speed of both initially (which I can’t remember, this is also a 3D question and I can’t remember what else was given). If the 2 rocks stick together what is the end velocity?
A block is pushed with a force of 12N. The coefficient of kinetic friction is _____ and it experiences a velocity of _____. What is the horizontal force on the block
I think this was a 3D projectile motion question
To determine the end velocity of the two rocks that stick together, you'll need to use the concept of conservation of momentum. The total momentum before the rocks stick together should be equal to the total momentum after they combine.
Let's assume the mass of the first rock is m1 and its initial velocity is v1. Similarly, let's say the mass of the second rock is m2 and its initial velocity is v2. After they stick together, the combined mass can be denoted as M (M = m1 + m2). The end velocity is denoted as v.
The conservation of momentum equation can be written as:
(m1 * v1) + (m2 * v2) = M * v
However, since you mentioned that this is a 3D question and some additional information is missing, like the initial speeds and possible angles, it is difficult to provide a specific answer. To solve this problem, you will need to recall the initial speeds of both rocks and any additional information given, such as angles or distances. Knowing the initial speeds and angles will allow you to calculate the initial velocities in the x, y, and z directions. Using the equations of motion and the conservation of momentum, you can find the final velocity.
Regarding the second question about the block being pushed with a force of 12N. To determine the coefficient of kinetic friction and the velocity at which it is experienced, we would need to know additional information such as the mass of the block.
Once you have the mass of the block, you can use the equation:
Force of friction = coefficient of kinetic friction * Normal force
Since the block is being pushed horizontally, the normal force would be equal to the gravitational force acting on the block (mass of the block * acceleration due to gravity). The horizontal force on the block can be calculated using Newton's second law, which states:
Force = mass * acceleration
Without the mass of the block or any other specific information, it is not possible to provide an answer to these questions. Please provide the missing information so that I can assist you further.