Which statement is true about unbalanced forces?
A. they can change both an object's speed and direction.
B. they have no impact on an object in motion.
C. they only change an object's speed.
D. they only change an object's direction.
A. they can change both an object's speed and direction.
what is the unit used for measuring force?
A. joule
B. newton
C. gram
D. kilometer
B. newton
A. they can change both an object's speed and direction.
Unbalanced forces refer to a situation where the net force acting on an object is not zero. When unbalanced forces act on an object, they can cause changes in the object's motion, including both its speed and direction. Therefore, option A is the correct statement about unbalanced forces.
To determine which statement is true about unbalanced forces, we can analyze each option:
A. They can change both an object's speed and direction.
This statement is correct. Unbalanced forces can cause a change in both the speed and direction of an object. When multiple forces are acting on an object, and their magnitudes and/or directions are not equal or opposite, the object will experience a net force that changes its motion.
B. They have no impact on an object in motion.
This statement is incorrect. Unbalanced forces do have an impact on an object in motion. If the net force acting on an object is unbalanced, it will cause a change in its motion, either by altering the speed, direction, or both.
C. They only change an object's speed.
This statement is not true. Unbalanced forces can change an object's speed as well as its direction. It depends on the specific forces and their interactions.
D. They only change an object's direction.
This statement is also incorrect. Unbalanced forces can change an object's direction, but they can also change its speed or both, depending on the circumstances.
Therefore, the correct statement about unbalanced forces is: A. They can change both an object's speed and direction.