WorksheetsMA/VR/efficiency
Total questions: 15
Worksheet time: 12mins
A simple lever is a rigid bar which pivots at a point called the
anchor
The input force on a lever is called the
resistance force
effort force
The output force on a lever is called the
(a)
Mechanical advantage is
Using a lever, the person can raise a load of 2400 N using an effort of 350 N. Calculate the mechanical advantage.
6.9
You have a simple inclined plane with a length of 6 meters and a height of 2 meters. A 100 kg object is placed on this inclined plane. Calculate the velocity ratio when this object is allowed to slide down the inclined plane under the influence of gravity.
Roger invented a machine that would do his work for him. His machine used 5.6 N and produced 11 N. What is the mechanical advantage of this machine?
1.96
3.14
0.50
2.50
A mechanism has a mechanical advantage of 4 and a velocity ratio of 5. Calculate the efficiency of the mechanism.
1.25
0.80
0.20
A mechanism has the load arm move 1.2 m when the effort arm moves 2 m. Calculate the velocity ratio.
0.60
2.4
1.67
0.24
A machine has an efficiency of 80%. If the velocity ratio of the machine is 3.95, calculate the mechanical advantage.
4.94
2.50
A machine has an efficiency of 75%. If the mechanical advantage of the machine is 4.2, calculate the velocity ratio.
Velocity ratio (VR) is defined as the ratio of the distance moved by the point of application of the effort to the distance moved by the
(a)
A machine has a mechanical advantage of 2.8. Calculate the output force if an input force of 25 N is applied.
7
8.9
70
A machine has an efficiency of 60%. An effort of 48 N is required to move a load of 72 N. If the effort moves a distance of 4.5 m, calculate the distance the load moves.
4.05
1.8
A 5 metre ramp lifts an object to a height of 0.75 metres. Calculate the velocity ratio of the ramp.
6.7
0.15
