Book 3 Chapter 7: Application Of Basic Mechanics

Question 1

A turning moment is:
A) Force that tends to cause a circular motion
B) Force times time
C) Change in velocity per unit time
D) Change in position per unit time
E) Directed change in position per unit time

Answer 1

A) Force that tends to cause a circular motion

Question 2

An object with a mass of 95 kg is at a height of 36 m above the ground. What is its potential energy?
A) 348.62 J
B) 33.55 kJ
C) 3.42 kJ
D) 931.95 kJ
E) 1.71 kJ

Answer 2

B) 33.55 kJ

Question 3

Calculate the power required to pump 50 000 litres of water per minute to a vertical height of 72 m.
A) 69.44 kW
B) 360 kW
C) 49.05 kW
D) 588.6 kW
E) 706.32 kW

Answer 3

D) 588.6 kW

Question 4

A dynamic body with a mass of 79 kg is acted on by a force of 775 N, what is its acceleration? (F=ma)
A) 0.102 m/s
B) 981 m/s2
C) 9.81s2/m
D) 9.81 m/s2
E) 0.102 m/s2

Answer 4

D) 9.81 m/s2

Question 5

The capacity of a body to do work is defined as:
A) Mass
B) Force
C) Power
D) Energy
E) Pressure

Answer 5

D) Energy

Question 6

A lever is used to move a load of 10kN by applying an effort of 1000 N. What is the mechanical advantage of the lever?
A) 10
B) 1
C) 1000
D) 100
E) 10 000

Answer 6

A)10

Question 7

A body with a mass of 88 kg is moving at a velocity of 13.89m/s. What is its kinetic energy?
A) 13.89 kJ
B) 1.22 kJ
C) 6.9 kJ
D) 8489 J
E) 611.11 J

Answer 7

D) 8489 J

Question 8

Any action on a body which tends to change its size, shape or its state of motion is defined as:
A) Volume
B) Acceleration
C) Mass
D) Force
E) Displacement

Answer 8

D) Force

Question 9

Rate of doing work is defined as:
A) Any energy
B) Potential energy
C) Work
D) Kinetic energy
E) Power

Answer 9

E) Power

Question 10

Force acting in a direction at right angles to a surface, divided by the surface area, is defined as:
A) Weight
B) Acceleration
C) Friction
D) Pressure
E) Surface area

Answer 10

D) Pressure

Question 11

The ratio of the load to the effort is called:
A) Actual mechanical advantage
B) Velocity ratio
C) Work
D) Power
E) Efficiency

Answer 11

A) Actual mechanical advantage

Question 12

The equation for the Actual Mechanical Advantage (AMA) is:
A) Effort given/Load given
B) Load actual/Load given
C) Load given/Effort given
D) Load actual/Effort actual
E) Effort actual/Load actual

Answer 12

D) Load actual/Effort actual

Question 13

A class ______ lever has the fulcrum between the effort and the load.
A) I
B) III
C) IV
D) V
E) II

Answer 13

A) I

Question 14

Work is defined as:
A) The ability of a body to do work due to its motion
B) Ability of a body to do work by virtue of its position
C) The rate of doing work
D) The product of the force applied and the distance moved
E) Capacity of a body or substance to perform work

Answer 14

D) The product of the force applied and the distance moved

Question 15

A turning moment or “Moment” is a/an:
A) Movement that will tend to cause rotation
B) Action that causes rotation
C) Movement around a point that will cause or tend to cause rotation
D) Movement around a point
E) Action around a point that will cause or tend to cause rotation

Answer 15

E) Action around a point that will cause or tend to cause rotation

Question 16

Potential energy (PE) is:
A) The ability of a body to do work due to its motion
B) The rate of doing work
C) The product of the force applied and the distance moved
D) Capacity of a body or substance to perform work
E) Ability of a body to do work by virtue of its position

Answer 16

E) Ability of a body to do work by virtue of its position

Question 17

Velocity can be defined as:
A) A push or pull exerted on an object
B) Force per unit area
C) The rate of change of position
D) Capacity of a body or substance to perform work
E) The amount of substance of something

Answer 17

C) The rate of change of position

Question 18

A Class ______ lever has the load between the effort and the fulcrum.
A) II
B) III
C) IV
D) I
E) V

Answer 18

A) II

Question 19

The unit of pressure in the SI system is the:
A) Watt (W)
B) Kilogram (kg)
C) Pascal (P)
D) Metre per second (m/s)
E) Newton (N)

Answer 19

C) Pascal (P)

Question 20

The unit of power in the SI system is the:
A) Newton metre (Nm)
B) Newton
C) Joule (J)
D) Pascal (P)
E) Watt (W)

Answer 20

E) Watt (W)

Question 21

Power is defined as:
A) The rate of doing work
B) The ability of a body to do work due to its motion
C) Capacity of a body or substance to perform work
D) Ability of a body to do work by virtue of its position
E) The product of the force applied and the distance moved

Answer 21

A) The rate of doing work