The change in the motion of an object depends upon:. The greater the resultant force, the greater the change in the motion of the object. Whether a moving object speeds up, or slows down, depends on the direction of the resultant force:.
The two forces are completely equal and opposite. What is an example of a balanced force that keeps an object moving a constant velocity? The cruise control on a car attempts to equal the forces of friction with a forward force. Once constant velocity is obtained the two sets of forces are completely equal and opposite.
Unbalanced Forces :. Forces that are not opposite in direction and equal in size. Always cause a change in motion. When 2 unbalanced forces are exerted in the same direction, the combined force is the sum of the 2 forces. When the forces are at right angles the net force is equal to the resultant.
Use this description to answer the following questions. Click the button to view the correct answers. Which one of the velocity-time graphs best describes the motion of the box? Support your answer with sound reasoning. See Answer Graph B is correct. The box first accelerates with a negative downward acceleration until it hits the water. Upon hitting the water, the box experiences a balance of forces 50 N downwards due to gravity and 50 N upwards due to the water.
Thus, the box will finish its motion moving with a constant velocity. Graph B depicts both the initial negative acceleration and the final constant velocity. Which one of the following dot diagrams best describes the motion of the falling box from the time that they are dropped to the time that they hit the bottom of the pool? The arrows on the diagram represent the point at which the box hits the water. See Answer Tape A is correct.
Upon hitting the water, the box experience a balance of forces 50 N downwards due to gravity and 50 N upwards due to the water. Diagram A depicts both the initial downward acceleration and the final constant velocity. Several of Luke's friends were watching the motion of the falling box. Being "physics types", they began discussing the motion and made the following comments.
Indicate whether each of the comments is correct or incorrect? Support your answers. Once the box hits the water, the forces are balanced 50 N down and 50 N up. However, an object in motion such as the box will continue in motion at the same speed and in the same direction. When the box strikes the water, it stops accelerating; yet it does not stop moving.
Once the box hit the water, the forces are balanced 50 N down and 50 N up. The upward force of the water on the box is balanced by the downward pull of gravity. The box will continue in motion at constant speed. The box would only bounce upwards if the water applied an upward force greater than 50 N. As stated in the problem, the water applies only 50 N of upward force.
Furthermore, the upward force would first contribute to slowing the box down an upward acceleration before it could begin to actually move it upward.
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