WorksheetsScience Homework Quiz
Total questions: 27
Worksheet time: 54mins
All mechanical systems have this.
Cars
Light source
Energy source
Friction
A (a) is a simple machine that changes the amount of force you must exert in order to move an object
A fixed point that supports the lever
Load
Point
Pivot
Fulcrum
The force that you exert on a lever to make it move is called the (a) force.
The load is the mass of an object that is moved or lifted by a machine.
The mass of an object that is moved or lifted by a machine.
The force of an object that is moved or lifted by a machine.
The effort of an object that is moved or lifted by a machine.
The mass of an object that is moved or lifted over time.
The distance between the fulcrum and the effort force is called the (a) .
In the diagram, which word best describes resistance to movement that a machine must overcome.
effort force
fulcrum
load
effort arm
In the diagram, the force that you exert on a lever to make it move is called ...
effort force
fulcrum
load force
effort arm
This diagram shows this type of machine (a)
Levers can be sorted into how many classes?
(a)
The class a lever belongs to depends on the position of
the effort force and the fulcrum,
the effort force, the load, and the fulcrum,
the effort the load and the fulcrum,
the effort force, the load, the fulcrum and load effort,
What class of lever has the fulcrum between the effort and the load. A pair of scissors is an example of this.
Class 3
Class 2
Class 4
Class 1
A wheelbarrow is an example of this type of lever class.
Class 3
Class 2
Class 4
Class 1
A Class 3 lever, such as a wheelbarrow, always exerts a greater force on the load than the effort force you exert on the lever. In this type of lever, the load is between the effort and the fulcrum.
True
False
In a Class 3 lever the effort is exerted between the
fulcrum and effort force
force and load
load and load force
fulcrum and load
The hockey stick is an example of a class (a) lever.
The work you do on the machine is called...
input work
input force
output work
output force
The work the machine does on the load is ...
input work
input force
output work
output force
Machines make work easier because they change the size or the direction of the force exerted on the machine.
True
False
Mechanical advantage means...
The reduction of the effort produced by a machine to the force applied to the machine.
The increase of the force produced by a machine to the force applied to the machine.
The comparison of the force produced by a machine to the force applied to the machine.
The reduction of the force produced by a machine to the force applied to the machine.
In this diagram, the MA,or mechanical advantage, was 5. What does this mean?
This means the branch-lever made the job of lifting the truck 5 times harder.
This means the branch-lever had no impact on lifting the truck.
This means the branch-lever made the job of lowering the truck 5 times easier.
This means the branch-lever made the job of lifting the truck 5 times easier.
A machine can also have a mechanical advantage that is less than 1, such as riding a bike.
True
False
A machine may not have a mechanical advantage equal to 1, such as raising a flag up a flagpole.
True
False
One advantage of a Class 3 lever is ...
That the force needed will move the load a smaller distance and at a faster speed.
That the force needed will move the load a greater distance and at a slower speed.
That the force needed will move the load a smaller distance and at a slower speed.
That the force needed will move the load a greater distance and at a faster speed.
How much work, in joules, must you do to lift an elephant weighing 60 000 N up 1.5 m onto the back of a truck? remember w =f x d
(a)
You want to move a heavy object into a truck and you have found a ramp to lead up to the back of the truck. Will you need to exert more, less, or the same force?
more
less
the same
no force
If you exert a force of 100 N on a hockey stick, and the stick exerts a force of 20 N on the puck, what is the mechanical advantage of the stick?
remember, MA =load force/effort force
(a)
