Question 1
Question
The work needed to raise a load of 95kg to a height of 30 m is approximately
Question 2
Question
The pivot point of a lever is called
Answer

centre

pulley

Load

fulcrum
Question 3
Question
Calculate the MASS of the LOAD required to balance the EFFORT applied shown below.
Answer

824.6kg

1160.1kg

118.3kg

266.2kg
Question 4
Question
A motor has an input power of 3 kW and is 85 % efficient. What is the output power?
Answer

2.55 kW

3 kW

3.53 kW

2.4 kW
Question 5
Question
If an object has a mass of 50 Kg on earth, in space its mass would be
Answer

100 kg

490 kg

50 kg

41 kg
Question 6
Question
What is the power of a hoist required to lift an object of 20 kg, 20 m in 30 seconds.
Question 7
Question
Pliers rely on which principle for their operation
Answer

leverage

tension

torsion

friction
Question 8
Question
A motor has an input power of 50kW and an output power of 47kW. What is the efficiency of the motor?
Question 9
Question
A motor has an output power of 40kW and an efficiency of 80%. What is the input power of the motor?
Question 10
Question
The power input to a machine is 90 W and the output power is 60 W the efficiency of the machine is
Question 11
Question
The weight of an object is the
Answer

mass of the object divided by 9.81

the same as the mass when there is gravity

force acting on top of the object due to gravity

force acting directly below the object due to gravity
Question 12
Question
A mass of 9.5 Kg exerts a force on earth of
Question 13
Question
What is the power of a motor required to lift a load of mass 300kg 40m in 2 minutes.
Answer

981 W

6000 W

98.1 W

100 W
Question 14
Question
Calculate the distance D required to balance the effort and load shown
Question 15
Question
A motor has an output power of 40kW and an efficiency of 66.66%. What is the input power of the motor?
Question 16
Question
A 2kW heater is 90% efficient. The input power to the heater is
Question 17
Question
A mass of 30kg would have an weight of
Answer

0.327N

3.05kN

3.05N

294.3N
Question 18
Question
A motor has an efficiency of 73%. If the input power is 32kW, the output power available is
Answer

76.64kW

23.36kW

22.8kW

32kW
Question 19
Question
Calculate the work done when required to raise a load of 1000kg through a vertical distance of 20m.
Answer

19620J

20000J

200000J

196200J
Question 20
Question
A force of 50kN moves an object a distance of 2m. The work done is.
Question 21
Question
From the following diagram identify the Mass
Question 22
Question
From the following diagram what is the arrow pointing to
Answer

Fulcrum

middle point

Load

Distance
Question 23
Question
What is the relationship between force, mass and acceleration?
Answer

f = ma

f = m/a

f = m  a

f = m + a
Question 24
Question
What is the work done when a force of 30N move an object 10m
Answer

200 metres

300 Horse power

300 Watts

300 Joules
Question 25
Question
What is the gravitational pull on earth
Question 26
Question
The force of gravity on earth is considered to be
Question 27
Question
A load of 50Kg has a force of 25N applied what is the acceleration of the load