according to newton's first law, an object maintains its state of rest or motion unless acted upon by an external force. So a force is required to stop an object at rest and a force is also required to move an object at rest.
when the hockey player send a hockey puck flying across the ice , frictional force from the ice surface acts on the puck in opposite direction of the motion of puck to slow it down and stops it finally.
Answer:
1)
2) See below
Explanation:
1)
The system of equations that we have in this problem is:
(1)
(2)
(3)
Here we want to solve the system for .
First of all, we isolate T from eq.(2):
And we substitute this expression into eq(1):
Solving for , we get
Now we can substitute this into eq(3):
And re-arranging for we find:
2)
We see that this solution satisfies all special cases. In fact:
- If ,
- If and , we get
Also, this solution has dimensions of acceleration. In fact:
- The term at the numerator is in the form , where mass is in kilograms and g is in meters per second squared (so, it is in the form mass*acceleration)
- The term at the denominator is a mass, so it is in kilograms
This means that is (mass*acceleration)/(mass), therefore it has dimensions of acceleration.
Answer:
16921
Explanation:
Usually, if and when the truck does lose part of its load, or load gets cut into half, then it's momentum gets reduced to half of the original momentum. This is because, from the definition of momentum, we understand that it's the multiplication of mass and velocity. This means that if the mass gets reduced to half, then the total momentum goes ahead to be reduced to half just as well.
New momentum = 1/2 * 33842
New momentum = 16,921 kg∙m/s.
Hi there!
Recall the conservation of momentum:
For this type of inelastic collision:
Thus, the initial momentum equal the final momentum if there are no external forces.
We can begin by writing out this problem: