30 Questions
| Attempts: 7046

Questions and Answers

- 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?
- 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 block with a mass of 48kg is resting on a slope of a 23° angle. What is the normal reaction force of the block?
- 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.Rearrange the formula v=u+at to make t the subject
- 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 kgm^{2}at the beginning of the spin, what would his angular velocity be if his moment of inertia became 0.75kgm^{2}? 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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