WorksheetsGr. 8- Systems
Total questions: 21
Worksheet time: 18mins
A system is...
a group of parts that function together to perform a specific task.
the function performed.
independent of other mechanisms.
one part that performs work individually.
The two categories of systems are ________________ systems and _________________ systems.
(a)
What is a social system?
A system that relies on a group of physical parts to perform a function.
A group of people or other organisms joining together to perform tasks and establish relationships.
What is a physical system?
A system that relies on a group of physical parts to perform a function.
A group of people or other organisms joining together to perform tasks and establish relationships.
What is meant by input?
All of the tasks or services that the systems performs.
The function that the system is supposed to perform.
All of the things that go into a system to make it work.
What is meant by function?
The things that go into a system to make it work.
The tasks or services that the system performs.
The function that the system is supposed to perform.
What is meant by output?
All of the tasks or services that the system performs.
All of the things that go into a system to make it work.
The function that the system is supposed to perform.
What is the input of a bicycle?
The downward force applied to the pedals.
The forward motion of the bicycle.
To transport people from place to place.
The spinning of the wheels.
A mechanical system is a...
physical system
social system
An electrical system is a ...
physical system
social system
An Aboriginal clan is a...
physical system
social system
A push or pull is...
efficiency
work
energy
force
The ability to apply a force to move an object a distance is...
force
work
energy
efficiency
The result when a force moves an object a certain distance is...
work
force
energy
efficiency
What is the formula for work?
effort / efficiency
force x distance
force x distance x 100%
weight of object x distance moved
What is the formula for mechanical efficiency?
output energy / input energy x 100%
input energy / output energy x 100%
force / distance x 100%
input energy / output energy / 100%
The force needed to push a drawer is 80 N, and the distance it is pushed is 3 m. How much work was needed to move the drawer?
200 J
200 kJ
240 kJ
240 J
Person A picks up a 30 N rock and raises it 2 m off the ground. Person B picks up a 25 N rock and raises it 3 m off the ground. Who put more work into moving a rock?
Person A
Person B
You have asked 2 friends to help you push your car. Each of you applies 800 N of force and the car moves 2 m. How much work was done on the car?
4.8 kJ
1600 J
4800 kJ
4.8 J
A pulley takes a force of 85 N to raise a 60 N statue. The statue raises 4 m. What is the efficiency of the pulley?
82.5%
141%
70.5%
65%
It takes 65 N to raise a box 2m onto a truck. We can push the box up an 8m ramp using 20 N of force. What is the efficiency of the ramp?
123%
31%
81%
75%
