Jump Rope

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Jump Rope : 

Jump Rope Julia Lund and Lisa Kok

Slide 2: 

Preparation: The Squat Gastrocnemius Achilles Tendon Quadriceps Gluteus maximus Erector Spinae Anterior Tibialis Rectus Abdominus Levers: The knee is a third class lever here when you bend down into the squat position Muscles Skeletal: In preparation for the jump, bend knees so Femur is lowered to about 45. The Scapulas (shoulder blades) should be pulled back, spine erect, ribs and Sternum pushed very slightly out. Joints: Condylar joint to bend the knees. Saddle Joint in your ankles to lean forward and prepare to jump.

Slide 3: 

Newton’s Laws on the Preparation The preparation to jump in jumping rope involves only Newton’s first law. This is because the rope remains stationary in your hands until acted upon an outside force, when you begin to turn it, which takes place in the second step. Types of motion in the Preparation The squat in preparation for the jump involves linear motion to lower the body into position. Specifically, this linear motion takes place when the knees bend and the upper body in lowered with thigh at roughly 45.

Slide 4: 

The Take off and Spin Flexor Carpi Extensor Carpi Gastrocnemius Bicep Pronator Quadratus Supinator Brevis Hamstrings - Rectus Femoris Levers: - The elbow is a third class lever here, flexed to hold up the rope - The knee is used as a third class lever when you bend your knees up to lift off from the ground - Flexion of the foot and ankle here is a second class lever to lift the body up onto the toes and then off the ground Skeletal: You will start this next step by bending the elbow, pulling the Ulna and Radius in toward the Humerus. Spin the rope by moving the ulna and radius back and forth and rotating the carpals . In the take off you will rock forward onto you metatarsals and phalanges and push off. The knee should then bend in the air, pulling in the Fibula and Tibia near the Femur so the rope can move under the feet. Joints: Ellipsoid joint in wrist to turn rope. Condylar joint to extend and push of ground. Hinge joint to bend elbows.

Slide 5: 

Types of Motion in the Take off and Spin In the Spin we will use rotary motion in the arms, wrist, and rope. This is used to spin the rope in a counter clockwise direction for jumping over. We will also use linear motion, propelled by the legs, in an upward direction. We use this to lift off into the air so we can let the rope pass under out feet. Newton’s Laws in the Take off and Spin In this step, Newton’s second law is used. This law goes beyond the first because it helps define how much force is needed in order to put an object in motion. In this case, the amount of force needed to be exerted depends on the mass of the jump rope. The greater the mass, the more force needed in order to spin the rope.

Slide 6: 

The Follow Through and Landing Joints and Levers: The knee is a joint and third class lever which is slightly bent, used to absorb impact of landing. The ankle is a joint and second class lever which bends in order to absorb the impact of landing on the ground Skeletal: In the landing, the Fibula and Tibia will move away from the Femur, so that the knees will extend but keep a slight bend. When your feet meet the ground, you will land on the metatarsals and phalanges. You will then extend the talus so that the calcaneus meets the ground. Achilles Tendon Gastrocnemius Anterior Tibialis Quadriceps Rectus Abdominus

Slide 7: 

Newton’s Laws in the Landing: In the landing and recovery, Newton’s third law is exhibited. This states that for every action there is an equal and opposite reaction. The reaction in this case is the jumping, and the opposite and equal reaction is the landing. So, for how high or forcefully you jump, you will have to absorb that equal amount of energy in the landing. Types of Motion: In the landing and recovery, rotary motion is used to spin the rope with the arms and wrists in order to follow through the full motion. Also, linear motion is used when extending the legs and landing the feet on the ground after the jump.

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