IB-SEHS 4.3 Biomechanics

Which is the equation for force?

• Force = mass x acceleration

• Force = displacement / time

• Force = velocity / time

• Force = velocity x mass

Which are vector qualities?

I. Momentum

II. Speed

III. Velocity

• I and II only

• I and III only

• II and III only

• I, II, and III

Which of the following defines momentum?

• force x time

• velocity x time

• mass x velocity

• mass x distance

What is the centre of mass of a body?

• The geometric centre of the body

• The average weight between the appendicular and axial skeletons

• The point equidistant between the navel and the third lumbar vertebrae

• The point at which the mass and weight of a body/object are balanced in all directions

What is the relationship between angular momentum, angular velocity and moment of inertia?

• Moment of inertia = angular velocity x angular momentum

• Angular momentum = angular velocity / moment of inertia

• Angular velocity = moment of inertia / angular momentum

• Angular momentum = angular velocity x moment of inertia

Which type of lever is used in plantar flexion?

• First

• Second

• Third

• No lever is used in plantar flexion

The diagram shows the operation of a lever when rising up on the toes. What part of the lever is labelled X?

• Fulcrum

• Effort

• Load

• Resistance

Which of the following describes Newton's second law of motion?

• The rate of change of momentum of a body is proportional to the force causing it.

• To bring about motion a force must be applied.

• When one body applies a force to another the second body will apply an equal and opposite force back.

• The effect of a constant force on a mass will always be the same.

A tennis player hits a ball, the ball exerts a force on the ball and the ball exerts an equal and opposite force on the racket. Which Newton's law of motion is this example explaining?

• Newton's First Law: Law of Inertia

• Newton's Second Law: Law of Acceleration

• Newton's Third Law: Law of Reaction

• Newton's Fourth Law: Law of Studying

When one kicks a soccer ball, which Newton's law of motion are you producing?

• Newton's First Law: Law of Inertia

• Newton's Second Law: Law of Acceleration

• Newton's Third Law: Law of Reaction

• Newton's Fourth Law: Law of Studying