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WorksheetsChapter 5 Work and Machines
Total questions: 34
Worksheet time: 17mins
A slanted surface used to raise an object is a(n)
____.
efficiency board
effort ramp
inclined plane
screw
A device that does work with only one movement and changes the size or direction of a force is a(n) ____.
compound machine
effort machine
screw
simple machine
A bar that is free to pivot about a fixed point is a
____.
fulcrum
lever
ramp
screw
The rate at which work is done is called ____.
efficiency
effort time
force
power
The amount by which a machine multiplies an effort force is called the ____.
efficiency factor
fulcrum
mechanical advantage
resistance force
An inclined plane wrapped around a cylindrical
post is a ____.
block and tackle
lever
ramp
screw
A machine that changes only the direction of a force has a mechanical advantage of ____.
100
10
5
1
A winding mountain road is an example of a(n)
____.
block and tackle
lever
inclined plane
wheel and axle
When two or more simple machines work together, they are called a(n)____.
compound machine
effort machine
screw
simple machine
The unit of power is the ____.
joule
watt
m/s
second
A lever with a mechanical advantage greater than 1 is used to ____.
change direction
increase distance
increase force
increase force and change direction
Three of the following simple machines are basically the same. The one that does NOT belong with the group is the ________________.
lever
pulley
wedge
wheel and axle
Two simple machines that are part of a bicycle are a(n)____.
gear and a wheel and axle
inclined plane and a lever
inclined plane and a wedge
screw and an inclined plane
_____ is transferred to an object when work is done.
Energy
Force
Motion
Friction
The output work of a machine compared to the input work is the _____ of the machine.
efficiency
power
effort
resistance
Two inclined planes put together form a simple machine called a(n)
screw
effort arm
lever
wedge
A system of pulleys designed to multiply the effort arm is called a
simple pulley
fixed pulley
movable pulley
block and tackle
The mechanical advantage of a single fixed pulley is always one because
the pulley changes only the direction of the effort force
the pulley changes only the size of the effort force
the pulley changes the size and direction of the effort force
the pulley changes only the speed at which the effort force is exerted
Which of the following CANNOT be done by a simple machine?
change the direction of a force
increase the amount of work done
decrease the time it takes to do work
transfer energy from one location to another
Which is NOT a type of pulley?
simple pulley
fixed pulley
movable pulley
block and tackle
Which would provide a greater mechanical advantage: a screwdriver with a 5 cm handle and a 1 cm shaft OR a screwdriver with a 3 cm handle and a 1 cm shaft?
the screwdriver with the 5 cm handle and the 1 cm shaft
the screwdriver with the 3 cm handle and the 1 cm shaft
both would provide the same mechanical advantage
more information is needed to answer this question
What is required for work to be done?
The object has to move
The object has to move, and the movement can be in any direction
The object has to move, but the movement must be in the direction of the applied force
The object cannot move
Why would adding oil to the moving parts of a machine increase its efficiency?
It increases the ideal mechanical advantage
It decreases the ideal mechanical advantage
It increases friction
It decreases friction
Which of the following is related to an inclined plane?
pulley
screw
wheel and axle
block and tackle
Which of the following is related to a lever?
wheel and axle
screw
wedge
Which of the following is related to an inclined plane?
wheel and axle
pulley
block and tackle
wedge
Which of following is related to a lever?
screw
pulley
wedge
In figure 5-3A, what is the ideal mechanical advantage of the inclined plane?
0
2
3
1
In Figure 5-3A, what is the weight of the block, if the IMA is 3?
210 N
23 N
70 N
140 N
In Figure 5-3A, what is the amount of work required to move the block along the total length of the inclined plane [from the bottom of the inclined plane to the top of the inclined plane]?
70 J
280 J
700 J
840 J
If the weight of the block in Figure 5-3A were doubled, the work required to move it up the length of the inclined plane would be
1/2 as much
1/4 as much
doubled
quadrupled
If the efficiency of the fixed pulley in Figure 5-3B were 100%, the force required to lift the block off the ground would be
less than the weight of block R
equal to the weight of block R
more than the weight of block R
The fixed pulley in Figure 5-3B
doubles the force required to lift the block
decreases the force required to lift the block
makes the block easier to lift by changing the direction of the force needed to lift it
increases and changes the direction of the force
How are work, time, and power related?
W = f x d
P = W x t
P = W / t
W = P x d
