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  2. File:Parallelogram of forces - ball on slope.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Parallelogram_of...

    English: [1] Forces on a particle on a smooth slope. There is a the force due to the weight of the particle (vertical) and the reaction of the slope on the particle (if the particle had spacial dimensions, these two forces would not be collinear and hence a torque would develop). [2]

  3. Reuleaux tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Reuleaux_tetrahedron

    The Reuleaux tetrahedron is the intersection of four balls of radius s centered at the vertices of a regular tetrahedron with side length s. [1] The spherical surface of the ball centered on each vertex passes through the other three vertices, which also form vertices of the Reuleaux tetrahedron.

  4. List of knot terminology - Wikipedia

    en.wikipedia.org/wiki/List_of_knot_terminology

    A bight is a slack part in the middle of a rope, usually a curve or loop. [1] [2] Knots that can be tied without access to either end of the rope are called knots in the bight. To tie a knot with a bight is to double up the rope into a bight and then tie the knot using the double rope.

  5. Ball (rhythmic gymnastics) - Wikipedia

    en.wikipedia.org/wiki/Ball_(rhythmic_gymnastics)

    For gymnastics, the ball originally began as a small ball around the size of a tennis ball and grew in size to make it easier for the audience to see and for the gymnast to roll along the body. [ 1 ] Early 1920s: The use of balls in various gymnastics schools in Europe emerged, focusing on simple throws and catches to enhance physical fitness ...

  6. Block and tackle - Wikipedia

    en.wikipedia.org/wiki/Block_and_tackle

    Typical values are 1.04 for roller bearing sheaves and 1.09 for plain bearing sheaves (with wire rope). [11] The increased force produced by a tackle is offset by both the increased length of rope needed and the friction in the system. In order to raise a block and tackle with a mechanical advantage of 6 a distance of 1 metre, it is necessary ...

  7. Kendama - Wikipedia

    en.wikipedia.org/wiki/Kendama

    "Deer horn and ball" was the form that the kendama took on when it arrived in Japan for the first time, literally a deer horn attached to a ball. Later on, some people replaced the deer horn with a piece of bamboo due to deer horn costing too many resources, making the bamboo and ball .

  8. Free body diagram - Wikipedia

    en.wikipedia.org/wiki/Free_body_diagram

    In physics and engineering, a free body diagram (FBD; also called a force diagram) [1] is a graphical illustration used to visualize the applied forces, moments, and resulting reactions on a free body in a given condition. It depicts a body or connected bodies with all the applied forces and moments, and reactions, which act on the body(ies).

  9. Bouncing ball - Wikipedia

    en.wikipedia.org/wiki/Bouncing_ball

    This roughly corresponds to a COR of 0.735–0.775 (Type 1 ball), 0.728–0.762 (Type 2 & 3 balls), and 0.693–0.728 (High Altitude balls) when dropped on the testing surface. [ note 3 ] ITTF : Regulates the playing surface so that the table tennis ball bounces approximately 23 cm when dropped from a height of 30 cm. [ 46 ] This roughly ...

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