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TODAY’S SESSION
Lever loverz
KAHOOT
Multi choice quiz :)
SAQs with table groups!
Win of the Weekend!
TODAY’S SESSION
WIN OF THY WEEKEND
EFL, FLE, LEF
FLE(e) away from the Q
F
L
E
FLE(e) away from the Q
F
L
E
WHITEBOARD:Lever lovers (10 mins)
WHITEBOARD:Lever lovers (10 mins)
| CLASS 1 EFL | CLASS 2 FLE | CLASS 3 LEF |
Which diagram goes where :)? LABEL
| | | |
Mechanical advantage | <1 or >1 | Always >1 (because load is closer to the fulcrum than effort) | Always <1 (because effort is closer to the fulcrum than load) |
Other examples | Seesaw, scissors | Wheelbarrow, calf raises (gastrocnemius during standing on tiptoe), jaw (biting down) | Bicep curl, biting using jaw, fishing rod, knee during running, |
WHITEBOARD:Lever lovers (10 mins)
KAHOOT time
VECTOR
The rock question✨
For Class 2 levers, the mechanical advantage is always greater than 1 because the force arm is always longer than the resistance arm!
Travis the Daredevil, known for launching himself off questionable homemade ramps for internet fame, is preparing for his next stunt. He cycles toward his ramp and pushes off with a horizontal force component of 960 N.He weighs 70 kg, but no worries—his ramp is so perfectly engineered (by YouTube DIY standards) that it magically exerts just enough vertical force to balance his weight.
🛞💥Q1 Travis the daredevil
RIP TRAVIS 07.04.2025
Travis’ jump miraculously turned into a purely vertical fall. At the peak of his jump, Travis’s gravitational potential energy (GPE) is 15.4 kJ
b) Calculate the height Travis fell from rounded to two decimal
places
c) Calculate how long Travis will fall for before he experiences
the most painful death imaginable, rounded to two decimal places
Travis the Daredevil, known for launching himself off questionable homemade ramps for internet fame, is preparing for his next stunt. He cycles toward his ramp and pushes off with a horizontal force component of 960 N.He weighs 70 kg, but no worries—his ramp is so perfectly engineered (by YouTube DIY standards) that it magically exerts just enough vertical force to balance his weight.
RIP TRAVIS 07.04.2025
Travis’ jump miraculously turned into a purely vertical fall. At the peak of his jump, Travis’s gravitational potential energy (GPE) is 15.4 kJ
b) Calculate the height Travis fell from rounded to two decimal
Places =22.45m
c) Calculate how long Travis will fall for before he experiences
the most painful death imaginable, rounded to two decimal places
=2.14 seconds
🛞💥Q1 Travis the daredevil
Q2 MAX ARM TORQUE
The data below provides the maximum isometric force and moment arm length for each of the key elbow flexors and extensors at this joint position.
muscle | Max isometric force (N) | Moment arm length (cm) |
Triceps long head | 900 | 2.5cm |
Triceps lateral head | 850 | 2.8cm |
Triceps medial head | 800 | 2.2cm |
Biceps brachii | 700 | 3.0cm |
Brachialis | 750 | 2.5 cm |
calculate the total maximum extension torque (N m) that can be produced at the elbow
ANEURYSM
calculate the total maximum extension torque (N m) that can be produced at the elbow= 63.9 N m
Q2 MAX ARM TORQUE
Q3 CRUTCHES!
A patient weighing 90 kg with a broken leg shifts 40% of their body weight onto their crutches.
Q3 CRUTCHES!
A patient weighing 90 kg with a broken leg shifts 40% of their body weight onto their crutches.
90 kg x 0.4 = 36 kg
36 kg x 9.8 m/s^2 = 352.8 N
P = (½) x F/A
= ½ x (352.8 N / 0.0015 m)
= 117,600 N/m^2 = 117.6 kPa
Q4 nurse lift
A nurse must lift a 70 kg patient from a bed into a wheelchair.
Q4 nurse lift
A nurse must lift a 70 kg patient from a bed into a wheelchair.
Fg of patient = 70 kg * 9.8 m/s^2 = 686 N
The nurse lifts the patient to a height of 0.8m in 3 seconds. What is the average velocity of this lift to 3 dp? (1 mark)
0.8m / 3 s = 0.267m/s
Lift with her back and arms. This distributes the force around the body and reduces the amount of force applied to her wrists to reduce the risk of damage.
Q5 Help Jas and Trav get to the biomed ball!
Travis and Jas are taking a 10m limo that weighs 4000kg to drive to the biomed ball!
The limo’s centre of mass is 4m behind the front of the limo. Where should a 1400kg disco ball be placed so that it’s centre of mass will be right in the middle of the limo?
Travis and Jas are taking a 10m limo that weighs 4000kg to drive to the biomed ball!
The limo’s centre of mass is 4m behind the front of the limo. Where should a 1400kg disco ball be placed so that it’s centre of mass will be right in the middle of the limo?
=7.86m back
Q5 Help Jas and Trav get to the biomed ball!