Use this formula to solve this problem:
2 answers:
You might be interested in
Answer:
The coefficient of dynamic friction is 0.025.
Explanation:
Given:
Initial speed after the push is 'v' as seen in the graph.
Final speed of the stone is 0 m/s as it comes to rest.
Total distance traveled is,
Total time taken is,
Time interval for deceleration is 3.5 to 17.5 s which is for 14 s.
Now, average speed of the stone is given as:
Now, we know that, average speed can also be expressed as:
Now, from the graph, the vertical height of the triangles is,
The deceleration is given as the slope of the line from time 3.5 s to 17.5 s.
Therefore, deceleration is:
Frictional force is the net force acting on the stone. Frictional force is given as:
Now, from Newton's second law, net force is equal to the product of mass and acceleration.
Therefore,
Plug in 0.244 for 'a' and 9.8 for 'g'. This gives,
Therefore, the coefficient of dynamic friction is 0.025.
The acceleration of an object in free fall is
Explanation:
We can solve the problem by using Newton's second law of motion, which states that:
where
F is the net force on an object
m is the mass of the object
a is its acceleration
For the object in this problem, we have:
m = 9.9 kg is its mass
F = 97.02 N is the net force on the object
So, we can rearrange the equation to find its acceleration:
This value is actually known as acceleration of gravity (g), and it is the acceleration that any object in free fall has near the Earth's surface, regardless of its mass.
Learn more about Newton's second law here:
And about free fall:
#LearnwithBrainly