A crate filled with food rests on a horizontal floor. Only gravity and the support force of the floor act on it, as shown by the vectors for weight W and normal force N.

Question

1) The net force of the crate is 
    a) zero
    b) greater than 0 
2) The evidence for Numer one is...

A slight pull P is exerted on the crate, not enough to move it.

1) A force of friction f now acts which is ___ P.
     a) less than
     b) equal to
     c) greater than
2) This type of friction is called _____ friction.
     a) static
     b) sliding or kinetic
     c) rolling 
3) The net force on this crate is...
     a) zero
     b) greater than zero

The pull on the crate is increased until the crate begins to move. It is pulled with pull P so that it moves with constant velocity across the floor.

1) Friction is ____ P. 
     a) less than
     b) equal to
     c) greater than
2) This type of friction is called _____ friction.
     a) static
     b) sliding or kinetic 
     c) rolling 
3) Constant velocity means acceleration is...
    a) zero 
    b) greater than zero
4) The net force on the crate is ____ zero.
    a) less than
    b) equal to
    c) greater than

The pull P is further increased and is now greater than friction f.

1) The net force on the crate is ____ zero.
    a) less than
    b) equal to
    c) greater than

John · Answer

you need a picture

bobpursley · Answer

actually, you need to give a shot at this before I give answers. I avoid answer grazers, it is tough on my blood pressure.

bob · Answer

please check

A crate filled with food rests on a horizontal floor. Only gravity and the support force of the floor act on it, as shown by the vectors for weight W and normal force N.

1) The net force of the crate is
a) zero<<<<<
b) greater than 0
2) The evidence for Numer one is...
>>>there are no acting forces
A slight pull P is exerted on the crate, not enough to move it.

1) A force of friction f now acts which is ___ P.
a) less than
b) equal to
c) greater than<<<<<<<<<
2) This type of friction is called _____ friction.
a) static
b) sliding or kinetic<<<<<<<<
c) rolling
3) The net force on this crate is...
a) zero
b) greater than zero<<<<<<<

The pull on the crate is increased until the crate begins to move. It is pulled with pull P so that it moves with constant velocity across the floor.

1) Friction is ____ P.
a) less than<<<<<<<<<
b) equal to
c) greater than
2) This type of friction is called _____ friction.
a) static
b) sliding or kinetic <<<<<<<<<
c) rolling
3) Constant velocity means acceleration is...
a) zero <<<<<<<<
b) greater than zero
4) The net force on the crate is ____ zero.
a) less than
b) equal to
c) greater than <<<<<<<<<<

The pull P is further increased and is now greater than friction f.

1) The net force on the crate is ____ zero.
a) less than
b) equal to
c) greater than<<<<<<<<<<