THIRD CLASS LEVERS Third class levers : The force is between the axis the resistance. EXAMPLES : - bicep curl - Kicking a ball FORCE RESISTANCE AXIS A A R R F F LEVERS THE PRINCIPLE OF LEVERAGE: That the velocity is greater at
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Presentation Transcript
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THIRD CLASS LEVERS # Third class levers : The “force” is between the axis & the resistance. # EXAMPLES :
- bicep curl - Kicking a ball FORCE RESISTANCE AXIS A A R R F F<br>
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LEVERS # THE PRINCIPLE OF LEVERAGE:
“ That the velocity is greater at the end of a long lever than at the end of a short lever”. OR “ That the further a point of a lever is from the axis then the greater its velocity.<br>
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LEVERS # THE PRINCIPLE OF LEVERAGE:
“ That the velocity is greater at the end of a long lever than at the end of a short lever”. A 3 IRON WILL HIT THE BALL FURTHER THAN A 9 IRON OR “ That the further a point of a lever is from the axis then the greater its velocity.<br>
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LEVERS # THE PRINCIPLE OF LEVERAGE:
“ That the velocity is greater at the end of a long lever than at the end of a short lever”. THE ARM & RACQUET SHOULD BE FULLY EXTENDED AT IMPACT OR “ That the further a point of a lever is from the axis then the greater its velocity.<br>
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LEVERS # THE PRINCIPLE OF LEVERAGE:
“ That the velocity is greater at the end of a long lever than at the end of a short lever”. THE LEG SHOULD BE FULLY EXTENDED AT IMPACT WHEN KICKING A BALL FOR DISTANCE OR “ That the further a point of a lever is from the axis then the greater its velocity.<br>
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LEVERS # THE PRINCIPLE OF LEVERAGE:
“ That the velocity is greater at the end of a long lever than at the end of a short lever”. A BASEBALL BATTER SHOULD GRIP THE BAT AT THE END OF THE HANDLE TO MAKE THE BAT AS LONG AS POSSIBLE OR “ That the further a point of a lever is from the axis then the greater its velocity.<br>
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REVISION QUESTIONS 1. The two main functions of levers are to :
A/ increase force and decrease speed.
B/ increase force and increase speed.
C/ decrease force and decrease speed.
D/ decrease force and increase speed. 2. Which of the following is NOT an example of a first class lever ?
A/ bottle opener.
B/ scissors.
C/ see saw.
D/ crowbar. 3. A wheelbarrow is an example of a :
A/ first class lever.
B/ second class lever.
C/ third class lever.
D/ fourth class lever.<br>
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REVISION QUESTIONS 4. In kicking a football the lower leg acts as a :
A/ first class lever.
B/ second class lever.
C/ third class lever.
D/ fourth class lever. 5. In order to maximise force when serving in tennis, the player should :
A/ have the arm fully extended holding slightly up the grip on contact.
B/ have the elbow bent at an angle of 90 degrees.
C/ have the arm fully extended holding the end of the grip on contact.
D/ have the arm slightly flexed holding the end of the grip on contact. 6. Give four examples of leverage in sport. Cricket bat, hockey stick, tennis racquet, bowling arm, kicking leg In simple terms a number 3 iron will hit the ball further than a 9 iron when
playing golf.
Neglecting the influence of the angle of the club head, why is this so ? A 3 iron is longer than a 9 iron so the club head will travel faster on 3 iron.
A faster club head speed will mean a faster ball speed & greater distance.<br>
