Levers + linear motion

Question 1

1st class lever sporting example

Answer 1

-Throwing a ball: the elbow joint acts as the fulcrum, the tennis ball acts as the load, and the triceps brachii contracting acts as the effort

Question 2

2nd class lever sporting example + mechanical advantage

Answer 2

2nd class level sporting example is calf extension at the ankle joint; the ankle joint acts as the fulcrum, the free weight acts as the load, and the gastrocnemius contracting acts as the force
-The 2nd class levers have a mechanical advantage, as they can lift heavy weights efficiently, however, they cannot move heavy weights quickly or over a long period of time

Question 3

3rd class lever sporting example

Answer 3

3rd class lever sporting example is a bicep curl, elbow joint acts as the fulcrum, biceps brachii contracting acts as the effort and the weight acts as the load
-3rd class levers are the most common and can life weights at a high velocity, but cannot lift heavy weights due to a mechanical disadvantage

Question 4

Linear motion

Answer 4

Linear motion is the movement of a body in a straight line, where all body parts are moving at the same speed, direction, or time
-Linear motion is cause by an external force applied to the centre of mass of an object

Question 5

-Acceleration

Answer 5

-Acceleration is the rate of change in velocity = Final velocity- initial velocity/ time

Question 6

Displacement

Answer 6

Displacement is the shortest path between start and finish positions (finish position-start position)

Question 7

Distance

Answer 7

Distance is the length of the path taken between the start position and the finish position (distance - speed x time)

Question 8

Speed

Answer 8

-Speed is movement of a body per period of time (m/s)
-Speed = distance divided by time

Question 9

Velocity

Answer 9

Velocity is the change in the rate of displacement
-Velocity+ displacement/time