SL Review biomechanics

Question 1

Hannah is slowing down in negative direction, how is her acceleration, postive, negatice, zero?

Answer 1

Positive

Question 2

Does increasing surfce area in contact increase the force of friction?

Answer 2

no - surface area does not influence friction

Question 3

When 2 rotating objects have same angular velocity, the object w the ____ radius has a greater centripetal acceleration

Answer 3

larger

Question 4

According to Newtons 2nd law (law of acc) angular velocity is ___ porportional to the net external torque and _____ porportional to the moment of inertia

Answer 4

Directly, indirectly

Question 5

Object A has twice the mass of object B bu object B has twice the velocitu of object A.. Which has the greater kinetic energy?

Answer 5

object B

Question 6

A launched ball has an initial horizaontal velocity of 4m/s, how long will it tkae the ball to travel horizontal distance of 24m?

Answer 6

x = vΔt

Switch to t=x/v
24/4 = 6

Question 7

Which muscle design helps to maximize the force of a contraction?

Answer 7

Fibers arranged parallel (side-by-side) - more fibers = more force

Arranged in series (end-to-end) = faster contractions

Question 8

How do fibers arranged in series (end to edn) impact muscle force?

Answer 8

contractions are faster but with less force than parallel

Question 9

If 2 golf clubs of different lengths have the same angualr velocity, which club will have a greater linear velocity?
a) both clubs have same
b) longer club
c) shorter club

Answer 9

longer club

Question 10

Is maximal muscle power achieved at the highest possible contraction force ?

Answer 10

No -

Question 11

what happens to linear momentum when velocity increases by a factor of 2?

Answer 11

linear momentum also increases by 2. -directly porportional

Question 12

It takes luna 50 seconds to corss 30m field waht is her avg linear speend in km/h as she crosses field?

Question 13

Erica lowers her bad towards the froudn with downwards force. THis is an example of _____ work

Answer 13

psotivive - negative force and - distance so = psotiive

Question 14

an obejct falls off a eldge ad lands on the groun below at what point is the objects total mehcanical energy the highest?

Answer 14

when ball is on ledge - ground or halfway - the totalt energy is always the same bc of consevation of energy

Question 15

True or false? One way mucle fprce production can be increased is by increasing th discharge rate of active motor units?

Answer 15

true - rate coding

Question 16

How can you get a larger contraction force (2 ways)

Answer 16

rate coding - incrasing discharge rate of active motor units
Recutitment

Question 17

Which of the following is not a vector quantiti? moment of inertia, angular velocity,

Answer 17

momemnt of inertia - scalar

Question 18

When 2 obejcts collide the coeffecient of resitution is 0 is this perfectly elastic or inelestic?

Answer 18

inelastic - 2 object collide move together with the same linear velocity in same direction

Question 19

Coeff of resitution is 1 is this perfectly elastic or inelastic?

Answer 19

elastic - 2 options collide hit eachother and trvale in differnet direction