Biomechanical Movement C4.3/4

Question 1

Define acceleration and the word equation used.

Answer 1

The rate of change of velocity. Avg Acceleration(m/s2) = change in velocity(m/s2)(FV-IV)/time(s)

Question 2

Define Momentum and the word equation used.

Answer 2

The product of mass and velocity of an object. Momentum(kgm/s) = Mass(kg) x Velocity(m/s)

Question 3

Is acceleration a Vector or Scalar quantity?

Answer 3

Vector

Question 4

Is momentum a Vector or Scalar quantity?

Answer 4

Vector

Question 5

If 3 players of different weights run at the same velocity, which will have the greatest momentum?

Answer 5

The player which weights the most as the greater the momentum, the greater the momentum if the velocity is constant

Question 6

How can momentum be conserved?

Answer 6

Momentum is conserved when a person/object is in flight. When in flight, mass & velocity cannot be altered, therefore, mass is constant.

Velocity can only be altered by external forces e.g Air Resistance or Gravity.

Question 7

What are internal forces?

Answer 7

Forces generated by skeletal muscle

e.g. A player using the gastrocnemius, quads & gluteals contracting concentrically to plantar flex the ankle & extend at the knee/hip during a jump

Question 8

What are external forces?

Answer 8

Forces generated outside of the body
e.g. A skier using air resistance and friction to allow them to gain maximum velocity using external forces