4. Complete the table. Type of force Change in stationary moving state of object Change in velocity Change in direction Balanced forces Unbalanced forces
Answers
Answer:
Unbalanced Forces
When forces on an object are balanced, there is no change in speed or
direction. So what do you need to do to move something? If something
starts to move, it must be because unbalanced forces are acting on it.
To have unbalanced forces means that the force applied in one direction is
greater than the force applied in the opposite direction. When unbalanced
forces are acting on an object, there is a change in speed and/or direction.
When you pushed lightly on the bucket in the class demonstration, it did
not move. It moved only when you pushed on it hard enough. To move
the bucket, the force you applied had to be greater than the friction force
acting in the opposite direction. One force (pushing) had to be greater than
the other force (friction) before the bucket would move. When one force is
greater than another, the forces are not balanced, they are unbalanced.
By applying an unbalanced force, you can change the motion of an object.
Unbalanced forces can make an object at rest start moving, make a moving
object stop, or change the direction and speed of the object.
Think back to the game of tug-of-war. At the start of the game, both teams
pulled equally hard on opposite ends of the rope. The two teams pulled with
balanced forces. The flag in the middle of the rope did not move.