Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Biomechanics Final
Conceptual Portion - Bruenger
| Question | Answer |
|---|---|
| A soft foam pit is used for landing during the pole vault. The foam pit cushions the landing of the vaulter by | increasing the displacement during landing |
| The force to be considered in calculating the work you perform when climbing up a set of stairs is your | weight |
| Power is equal to | force times displacement divided by time |
| Power is defined by | the ratio of doing work |
| The statement "a rotating body will maintain a state of constant angular motion unless acted on by an external torque" refers to | Newton's first law |
| The difference between positive and negative work stems from the direction of motion of the body the force acts on and the | The direction of the force acting on the body. |
| Stability may be increased by | The proximity of the COG to the edge of the base, width of the base, and the height of the center of gravity. |
| The center of gravity of an object of uniform density is located | At the exact center of the object |
| What happens to your center of gravity when you add a 200 N suitcase to your hand held out to your side? | The center of gravity shifts in the direction of the suitcase |
| Water pressure __________ with depth. Pressure is defined as __________. | Increases linearly; force per unit area |
| When fluid flows in parallel layers, this is know as: | Laminar flow |
| A long jumper performs a “hang” technique (extends arms above the head and lets the legs extend) during flight. What is the purpose of doing this. | Decreases angular velocity by increasing angular inertia |
| Units of momentum could be | kg x m/s |
| The product of a force and the time during which it acts defines | Linear impulse |
| Which of the following will improve leverage? | Increase force/effort in the arm and decrease resistance/load in arm. |
| When comparing dropping an egg on concrete compared to grass (assume the eggs are the same size and dropped from the same height). | The egg dropped on concrete experiences a higher force of landing. |
| In the kinetic energy equation, which component is most important. | Velocity |
| Kinetic energy is the energy? | Due to motion |
| When catching a baseball or softball with a glove, | The ball performs positive work on the glove and the glove performs negative work on the ball. |
| To determine the length of a moment arm, you would measure. | The perpendicular distance from the axis of rotation to the force's line of rotation. |
| When a human body is airborne (e.g., when a person leaps through the air), | The body's COG follows a parabolic path of flight, movement of the arms and legs will not influence the path of flight of the COG, and air resistance influences the flight path of the COG, but only if the body is moving rapidly. |
| For a body to be in static equilibrium, | All the forces in the body must sum to equal zero, all the torques in the body must sum zero, and the body must be stationary. |
| When we consider the dynamic fluid forces acting on an object, we must take into account the velocity of the object as well as the velocity of the fluid itself. | True |
| Drag due to the arrangement of an object in the fluid is known as: | Form drag |
| The SI units for torque are | Nm |
| In the human body, most of the lever systems formed by muscles pulling on bones are what class? | 3rd Class |
| Gravitational potential energy is the energy. | Position relative to earth |
| The form of energy associated with the stiffness and deformability of an object is called | Strain energy |
| The capacity for doing work that a body possesses because of its position or configuration is known as | Potential energy |
| If a force acts directly through an object's center of gravity, __________ acceleration will occur. | Linear |
| The concept that explains how a spinning baseball changes direction is called | The magnus effort |
| Drag due to the fluid sliding past the object is: | Surface drag |
| Two football players collide and bounce off each other. This would be an example of | Eleastic collision |
| Units of power could be | Watts and N x m/s |
| In the equation for calculating strain energy, the x symbolizes | The amount of deformation |
| An example of using impulse to safely decrease momentum would be | Landing on a matt when pole vaulting |
| Which lever always has a mechanical advantage? | 2nd |
| Which lever always has a mechanical disadvantage? | 3rd |
| Why keep bar close to body when performing a deadlift | The hips act as a fulcrum. Keeps the torque of the arms small. |
| Does the angular velocity or radius have more effect on momentum? | The radius. |
| If you double angular velocity, what do you do to the momentum? | double it |
| If you double the radius, what do you do to angular momentum? | Quadruple it. |
| Two people (lane 1 and 2) enter a curve on a track at the same time and complete the curve at the same time. What is true about their angular velocity? | They would have the same angular velocity, but different linear velocities. |
| What is the tangential velocity of an object rotating on a strength that si 0.5m long and is rotating at 4 radians/s? | 2 m/s |
| What are the two types of fluid flow? | Turbulent and laminar |
| What are the two types of drag? | Surface and form |
| Why do swimmers try to swim slightly underwater (especially in backstroke) | Lower drag slightly under water |
| What is the Magnus Effect? | A rotating object creates low air pressure. If you have low air pressure, the object will move into the low-pressure area. |
| How did they change the design of Javelin’s to make them not fly? | Moved the center of buoyancy (where all air seems to act on it) behind the center of gravity, creating a torque where the nose dips down. |
| Catching a basketball pass causes “ ” to “ ” energy | Kinetic; work |
| Which is more powerful, exerting 300N causing a velocity of 2m/s or exerting 200N causing a velocity of 3m/s | They are the same |
| Explain biomechanically why a knife glove is dangerous | Allow for more pressure with the same amount of force. A smaller area creates more pressure and is why knives and needles work. |
Created by:
ashlynelisef