Biomechanics Ultimate Exam: Quiz!
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- 1.Whats is the definiton of Kinematics?
- A.
The branch of mechanics that studies the motion of a body or a system of bodies without consideration given to its mass or the forces acting on it.
- B.
The branch of mechanics that is concerned with the effects of forces on the motion of a body or system of bodies, especially of forces that do not originate within the system itself.
- C.
The study of the motion of a body or a system of bodies with consideration given to its mass or the forces acting on it.
- D.
If the forces acting upon an object are balanced, then the acceleration of that object will be 0 m/s/s.
- 2.What is the definition of Kinetics?
- A.
The rate of change of displacement with respect to time.
- B.
The branch of mechanics that is concerned with the effects of forces on the motion of a body or system of bodies, especially of forces that do not originate within the system itself.
- C.
The distance between the initial and final point of an object. It is a vector quantity having both magnitude and direction.
- D.
The branch of mechanics that studies the motion of a body or a system of bodies without consideration given to its mass or the forces acting on it.
- 3.Which plane of motion lies vertically and divides the body into left and right halves?
- A.
The frontal plane.
- B.
The transverse plane.
- C.
Anatomical neutral position.
- D.
The sagital plane.
- 4.
![Which plane of motion is labelled as number 1 in the diagram? - ProProfs]( "Which plane of motion is labelled as number 1 in the diagram?")
Which plane of motion is labelled as number 1 in the diagram?- A.
The transverse plane.
- B.
The sagital plane.
- C.
The frontal plane.
- 5.What is Bernoulli's principle?
- A.
“As the velocity of a fluid increases, the pressure exerted by that fluid decreases.”
- B.
“As the velocity of a fluid decreases, the pressure exerted by that fluid decreases.”
- C.
“As the velocity of a fluid increases, the pressure exerted by that fluid increases.”
- 6.An aeroplane’s wing is specially shaped so that it gets some of its lift due to Bernoulli’s principle. Why is this?
- A.
The air travels more underneath the wing than above it. This creates higher pressure above the wing than below and lift is created.
- B.
The air travels more over the top of the wing than beneath it. This creates higher pressure below the wing than above it and lift is created.
- C.
The air travels more over the top of the wing than beneath it. This creates lower pressure below the wing than above it and lift is created.
- D.
The air travels more underneath the wing than above it. This creates lower pressure above the wing than below it and lift is created.
- 7.
- A.
433N
- B.
470.4N
- C.
450N
- D.
480N
- 8.What are the two main factors that affect the range of a projectile (when ignoring air resistance)?
- A.
Horizontal projection velocity and time of flight
- B.
Vertical projection velocity and time of flight
- C.
Angle of release and time of flight
- D.
Horizontal projection velocity and angle of release
- 9.What is velocity?
- A.
Velocity = change in displacement / time
- B.
Velocity = total distance travelled / time
- C.
Velocity = change in displacement / speed
- D.
Velocity = time / change in displacement
- 10.Why will a dimpled golf ball travel further than a smooth golf ball?
- A.
The smooth golf ball creates a larger area of turbulent air behind it which creates a larger area of high pressure so there will be less drag
- B.
The dimpled golf ball creates a smaller area of turbulent air behind it which creates a smaller area of low pressure so there will be less drag
- C.
The smooth golf ball creates a smaller area of turbulent air behind it which creates a smaller area of low pressure so there will be more drag
- D.
The dimpled golf ball creates a larger area of turbulent air behind it which creates a larger area of high pressure so there will be more drag
- 11.
- A.
T=v-u/a
- B.
T=u+a/v
- C.
T=v-u/at
- D.
T=u+av
- 12.What is the difference between distance and displacement?
- A.
Displacement is the distance between the start and end point only, distance is the total distance travelled along the path of motion
- B.
Displacement is the total distance travelled along the path of motion, distance is the distance between the start and end point only
- C.
Displacement is the distance between the start and end point only, distance is the distance between the start and end point only
- D.
Displacement is the total distance travelled along the path of motion, distance is the total distance travelled along the path of motion
- 13.In conservation of angular momentum what happens if the moment of inertia of an ice skater spinning becomes higher (assuming no angular momentum is lost?
- A.
The ice skater will spin faster
- B.
The ice skater will have lost angular momentum
- C.
The ice skater will spin slower
- D.
The ice skater will gain angular momentum
- 14.A golf ball is hit at an angle of elevation of 37° and an initial velocity of 45ms-1. If all fluid forces are ignored and g is taken to 9. 8ms-2 then what would the time to maximum height be?
- A.
4.78s
- B.
4.59s
- C.
5.82s
- D.
4.48s
- 15.If a golf ball is hit with an initial velocity of 41ms-2 and it takes 4.184s to reach maximum height, what would the maximum height be? Take gravity to be 9. 8ms-2
- A.
90.57m
- B.
82.34m
- C.
85.77m
- D.
87.29m
- 16.A rugby prop sprints away from a scrum with an acceleration of 0.2ms-2 for 10s. How far did he travel?
- A.
15m
- B.
20m
- C.
18m
- D.
10m
- 17.A golf ball is chipped out of a bunker with an initial velocity of 9.3ms-1 onto the green at an angle of 54° to the horizontal. The total flight time is 1.193s. What was the range of the ball?
- A.
6.52m
- B.
7.54m
- C.
6.01m
- D.
6.75m
- 18.A 5kg block is lifted from the floor onto a table 2 metre high. What is the work done?
- A.
98 Joules
- B.
115 Joules
- C.
90 Joules
- D.
102 Joules
- 19.Which formula represents potential energy?
- A.
PE=mgh
- B.
PE=1/2mv2
- C.
PE=mh
- D.
PE=mgh2
- 20.A high diver of mass 69kg leaps from a ledge 20m above the water. What is his potential energy at 10m above the water?
- A.
6805J
- B.
6030J
- C.
6502J
- D.
6762J
- 21.If a weight lifter has done 210.7J of work lifting a 50kg weight 0.43m from his shoulder in 0.7s, what was his power?
- A.
289W
- B.
301W
- C.
325W
- D.
310W
- 22.What is the magnitude of momentum of a cricket ball of mass 420g thrown at 20ms-1?
- A.
8.1Ns
- B.
8.7Ns
- C.
8.4Ns
- D.
7.9Ns
- 23.An ice skater performs a spin. If his angular velocity is 4.3π rad.s-1 and his moment of inertia is 0.9 kgm2 at the beginning of the spin, what would his angular velocity be if his moment of inertia became 0.75kgm2? Assume that no angular momentum is lost.
- A.
17.19 πrad.s-1
- B.
16.21 πrad.s-1
- C.
16.75 πrad.s-1
- D.
16.52 πrad.s-1
- 24.Which of the following statements best defines buoyancy?
- A.
A fluid will exert an upward force on an object immersed in it equal to the weight of the fluid displaced by the object.
- B.
An object will float if it is lighter than the fluid it is immersed in.
- C.
When surface tension is in equilibrium with the downward force applied by the immersed object.
- 25.Which of these is not one of Newton’s 3 laws of motion?
- A.
A body will continue in a state of rest of uniform velocity unless acted upon by an external force.
- B.
For every action there is an equal and opposite reaction.
- C.
A body moves in a circle about a point called the axis of rotation.
- D.
The acceleration of an object is directly proportional to the force causing it and is inversely proportional to the mass of the object.
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