What impulse is delivered to the ball?
The key here is that the impulse delivered by the floor to the ball equals the ball’s change in momentum. To determine the ball’s change in momentum, we have to determine the difference between its velocity upon hitting the floor, and its velocity upon rebounding.
What is impulse in simple terms?
Impulse is a term that quantifies the overall effect of a force acting over time. This equivalence is known as the impulse-momentum theorem. Because of the impulse-momentum theorem, we can make a direct connection between how a force acts on an object over time and the motion of the object.
What is difference between impulse and impulsive force?
The impulse of a force is also the integral of a force over a said period of time. Impulsive forces are huge forces acting on a body for a short period of time causing drastic momentum changes. There are specific forces which can act as an impulsive force like tension, normal reaction, etc.
What does negative impulse mean?
People forget what the sign of impulse means. Impulse is a vector, so a negative impulse means the net force is in the negative direction. Likewise, a positive impulse means the net force is in the positive direction.
Can you have a negative force?
Forces can be positive or negative. And forces which are aimed to the left are usually said to be in a negative direction. So, to be more accurate, in the above diagram we should call F1 a negative force, that is, negative 20 Newtons, and we should call F2 a positive force, or positive 18 Newtons.
Is clockwise left or right?
Clockwise is spinning in the direction of an analog clock. It is a way to describe circular motion. Left or Right turns are ways of describing a change in approach. Clockwise is constantly turning to the right.
Why is anticlockwise positive and clockwise negative?
Answer: Normally we take the positive X axis as reference. When moving UP (positive) the movement is in the anticlockwise direction. This is the logic behind taking anticlockwise as positive and clockwise as negative.
What means negative moment?
A bending moment that produces compression on the bottom side of a beam and tension on the top side.
Is compression positive or negative?
However, in geotechnical engineering, compressive stress is represented with positive values. Compressive stress is defined in the same way as the tensile stress but it has negative values so as to express the compression since dL has the opposite direction. ( L is the length of the object.)
Is bending stress positive or negative?
So, tension is positive, compression is negative. Shear forces are positive upwards when on the left side of the cut, but downwards on the right side of the cut (a good way to remember is that positive shear rotates the beam clockwise). Bending moment is positive if it generates tension on the bottom of the section.
What is another name for negative bending moment?
negative bending moment in British English (ˈnɛɡətɪv ˈbɛndɪŋ ˈməʊmənt) a bending moment that produces convex bending at the supports of a continuously supported beam.