# Can you guys help check my answers? - balanced force

Can you guys help check my answers? -- balanced force

It is possible to have more than one correct answer

A student attaches a string to the block of dry ice on the table, and pulls steadily on the block.

1. Which of the following forces act on the block?
a. the force of gravity
b. kinetic friction
c. a normal force
d. the pulling force

2. Which of the following describes the motion of the block while it's on the table? The block
a. speeds up for a bit, then moves at constant speed.
b. accelerates constantly.
c. slows down gradually to a stop.
d. moves at constant speed.

3. When the block reaches point B, the string breaks. Which of the following describes the motion
of the block? The block
a. moves at constant speed.
b. begins to slow immediately.
c. continues at constant speed for a while, then slows down.
d. continues to accelerate.

4. Eventually, the block reaches the edge of the table. After the block leaves the table, which of
the following forces act on the block?
a. the force of motion
b. a normal force
c. kinetic friction
d. the force of gravity
_________________________________________________________________________

5. A block of dry ice resting on a table is given a brief push. A moment later, which of the following
forces act on the block?
a. the force of gravity
b. kinetic friction
c. the force of the push
d. a normal force

6. Which of the following describes the motion of the block? The block
a. accelerates constantly.
b. continues at constant speed for a while, then slows down.
c. slows down gradually to a stop.
d. moves at constant speed.

## Answers and Replies

Andrew Mason
Science Advisor
Homework Helper

2 and 4 look right. There might be low kinetic friction but not quite 0. Are you told to assume that the block on the table does not experience friction?

AM