a few questions - physics homework help please?

Question

1. a monkey hangs stationary at the end of a vertical vine. What two forces act on the monkey? which, if either, is greater?

2. can an object be in mechanical equilibrium when only a single force acts on it ? explain.

3. if you pull horizontally on a crate with a force of 200 N, it slides across the floor in dynamic equilibrium. how much friction is acting on the crate ?

4. what is the definition of support force ?

5. what is the definition of static & dynamic equilibrium ?

please explain your answers - i need answers and the knowledge of how to do the problems on my own as well. thank you !

Answer 1

1) gravity and the tension of the vine. The forces are equal because the monky is in static equilibrium (i.e. not accelerating)

2) No. F=ma and if there is a net force acting on the object it will be accelerating.

3) 200N since it is neither accelerating nor decelrating. The -net- force is 0.

4) A support force is any force which prevents another force from causing a body to move. For example, the table provides a support force to prevent gravity from pulling your drink to the floor.

5) Equilibrium simply means that the -net- force on the object is 0. Static and dynamic define if the object is stationary or moving.

HTH

Doug

Answer 2

That an object is in equilibrium means a = 0 (net force = 0 N hence acceleration = o m/s^2). But this doesn't mean that v must be 0. If an object is moving with a vo = 5 m/s and the net force is 0, then it will go on moving for ever. Of course, in ideal conditions. (There is always a friction force, this is why the object will finally stop moving in real ones).

So, you have 2 cases: net force = 0 and v = 0, this is a static equilibrium and net force = 0 but v different from 0, this is a dinamic equiibrium.

Ilusion

Answer 3

u expect us to draw the graph n give u the answer?