Four students push on a block of wood with the forces shown in the diagram below. Assume friction is negligible.

Question

What is the net force acting on the block? Are the forces balanced or unbalanced? How will the block move?

a
The net force on the block is 25 N. The forces are unbalanced. The block will move to the right.
b
The net force on the block is 25 N. The forces are unbalanced. The block will move to the left.
c
The net force on the block is 25 N. The forces are balanced. The block will move to the left.
d
The net force on the block is 11 N. The forces are unbalanced. The block will move to the right.
e
The net force on the block is 11 N. The forces are unbalanced. The block will move to the left.
f
The net force on the block is 11 N. The forces are balanced. The block will move to the right.
g
The net force on the block is 11 N. The forces are balanced. The block will move to the left.
h
The net force on the block is 25 N. The forces are balanced. The block will move to the right.
Question 26
An object is moving at a constant speed. If a balanced force is applied in the opposite direction the object is moving, what will most likely happen?

a
The object will speed up.
b
The object will continue moving at a constant speed.
c
The object will slow down and eventually stop moving.
d
The object will change direction.

Answer 1

For the first question regarding the forces acting on the block:

To determine the net force, we first need to add up all the forces acting on the block. Without the specific magnitudes and directions presented in the diagram, I cannot give an exact answer. However, based on your provided options, the correct choice would depend on the sum of the applied forces. If we assume there are forces acting in both left and right directions, you must calculate the total forces on each side.

1. If the net force on the block is 25 N to the right and the forces are unbalanced, then the following option is correct:

   • a: The net force on the block is 25 N. The forces are unbalanced. The block will move to the right.

2. If the net force is actually 25 N to the left and the forces are unbalanced, then the following option would be correct:

   • b: The net force on the block is 25 N. The forces are unbalanced. The block will move to the left.

3. If the net force is 11 N to the right and the forces are unbalanced, the correct option would be:

   • d: The net force on the block is 11 N. The forces are unbalanced. The block will move to the right.

4. If the net force is 11 N to the left, it would be:

   • e: The net force on the block is 11 N. The forces are unbalanced. The block will move to the left.

5. If it's a balanced force, none of the options (c, f, g, h) would apply as there would be no net force resulting in motion.

Now for the second question regarding the object moving at a constant speed:

If a balanced force is applied in the opposite direction of the object's motion, then:

• An object will continue moving at a constant speed because motion at constant speed persists unless acted upon by an unbalanced force.

So, the correct answer is:

• b: The object will continue moving at a constant speed.

If you'd like, you can clarify the forces in the first question for a more precise answer!