Biomechanics 4.3.9-4.3.10

What is velocity?

• The speed of an object in a certain direction

• The amount of motion possessed by a moving body

• The rate of change in velocity

• The shortest distance from the initial to the final position of a moving body

Which is an example of a third-class lever?

• The ankle joint during plantar flexion

• The elbow during flexion

• The knee during rotation

• Third-class levers don't exist

Which levers have the effort and the load on the same side of the fulcrum?

I. First class lever

II. Second class lever

III. Third class lever

• I and II only

• II and III only

• I and III only

• I, II and III

What does the area under the curve represent?

• Momentum

• Distance

• Impulse

• Acceleration

Impulse is the product of force and time and is equal to change in momentum. Therefore, the longer the time a force is been applied to an object, the smaller the change in momentum of that object.

• True

• False

• Sure

During spins, and if there is no external force acting on the object, angular momentum..

• Increases

• Decreases

• There is no angular momentum on a spinning object

• Remains constant

Which one best defines angular momentum?

• Angular velocity x moment of inertia

• Angular velocity / moment of inertia

• Angular velocity - moment of inertia

• Angular velocity + moment of inertia

What causes an increase in angular velocity during a spin when no external forces are applied after the initial push?

• Increase in radius

• Increase in mass

• Decrease in moment of inertia

• Decrease in angular momentum

Select all the correct options.

"A body will remain/continue in a state of rest or uniform motion/velocity unless acted upon by external (or unbalanced) forces"

• Newton's first law of motion

• Newton's second law of motion

• Newton's third law of motion

• Law of inertia

Based on Newton's second law of motion (select all the correct answers)

• the greater the force applied to an object, the greater the acceleration

• if the same force is applied to two objects with different masses, the heavier object will have a greater acceleration

• the greater the force applied to an object, the smaller the acceleration

• if the same force is applied to two objects with different masses, the heavier object will have a smaller acceleration