WorksheetsWork and Machines
Total questions: 59
Worksheet time: 2hrs 16mins
Name
Class
Date
1.
Which of the following is work according to the scientific definition?
a)
pushing a box across the floor
b)
standing still while holding something heavy
c)
walking with a backpack on
d)
all of these are considered "work"
2.
Work only occurs when the direction of motion and direction of force are in the same direction.
a)
TRUE
b)
FALSE
3.
Work can occur without motion.
a)
TRUE
b)
FALSE
4.
Using 10 N of force to move a box 2 m,
= how much work?
= how much work?
a)
0 (zero) J
b)
20 J
c)
12 J
d)
8 J
5.
Device that makes work easier by changing the size or direction of the force (or both) is called a
a)
simple machine
b)
spring scale
c)
newton
d)
pulley
6.
What unit is used to measure work?
a)
Joule
b)
Meter
c)
Newton
d)
Gram
7.
Simple machines make work easier by
a)
increasing the energy needed to do the work, while reducing friction.
b)
changing the size or direction of the force, or both
c)
reducing work
d)
simple machines do all of these
8.
How does a ramp (inclined plane) make work easier?
a)
changing the direction of both the effort (input) force and the output force (load).
b)
decreasing the size of the effort force needed, by increasing the distance.
9.
How does a single fixed pulley make work easier?
a)
It changes the direction of the force. It is easier to pull downward.
b)
It increases the size of the force required by decreasing the distance.
10.
Which pulley makes work easiest?
a)
1
b)
2
c)
3
d)
they are all the same
11.
Simple machines reduce work, less work is done.
a)
TRUE
b)
FALSE
12.
Energy is the ability to do work.
a)
TRUE
b)
FALSE
13.
In these two equations
10 N x 1 m = 10 J
2 N x 5 m = 10 J
10 N x 1 m = 10 J
2 N x 5 m = 10 J
a)
The same amount of force is used.
b)
The same amount distance is covered.
c)
The same amount of work is done.
14.
Which shows work being done? (1 answer)
a)
sitting
b)
holding
c)
lifting
d)
carrying
15.
If an object does not move when a force is applied to it
a)
work is NOT done
b)
work is done
16.
If Sarah uses a ramp to put a box in a truck, while Nick lifts a similar box directly into the truck, who used MORE force?
a)
Sarah
b)
Nick
17.
Moving an object 15 m with 2N of force equals 12J of work.
a)
TRUE
b)
FALSE
18.
work = force x direction
a)
TRUE
b)
FALSE
19.
work = force x distance
a)
TRUE
b)
FALSE
20.
What are the units for work?
a)
newtons
b)
meters
c)
force
d)
joules
21.
An inclined plane wrapped around a rod forms this simple machine
a)
lever
b)
pulley
c)
screw
d)
wedge
22.
A simple machine that consists a rigid bar that pivot about a fixed point
a)
lever
b)
pulley
c)
wheel and axle
d)
fulcrum
23.
The "fixed point" on which a lever rests and, or pivots is known as which of the following?
a)
screw
b)
wheel and axle
c)
see saw
d)
fulcrum
24.
Stairs are a
a)
wedge
b)
pulley
c)
inclined plane
d)
wheel and axle
25.
A door knob is an example of which machine?
a)
wheel and axle
b)
swrew
c)
pulley
d)
inclined plane
26.
A _______ is a rope or chain wrapped around a wheel.
a)
wedge
b)
lever
c)
pulley
d)
screw
27.
This device
a)
wedge
b)
lever
c)
incline plane
d)
wheel and axle
28.
Is work being done if I am trying to pick up a box but can not lift it?
a)
yes
b)
no
29.
Identify this simple machine
a)
Lever
b)
Wheel & Axle
c)
Inclined Plane
d)
Screw
30.
The unit used to measure work is the
a)
Watt
b)
Newton
c)
Joule
d)
meter
31.
The amount of work done in a certain amount of time is known as
a)
work
b)
effort force
c)
resistance force
d)
power
32.
The unit used to measure power is the
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
33.
What is the equation for power?
a)
P = Work/time
b)
P = Force/time
c)
P = time/distance
d)
P = Work * time
34.
Where should the fulcrum be placed in order for the student to use the least amount of effort possible?
a)
point A
b)
point B
c)
point C
d)
point D
35.
A fishing pole is an example of a compound machine. What simple machines are used to make up this compound machine?
a)
lever, wheel and axle, pulley
b)
wheel and axle, inclined plane, pulley
c)
wheel and axle, pulley, inclined plane
36.
Jeff is a landscaping contractor and lifts a rock weighing 600 pounds by wedging a board under the rock. Jeff weighs 150 pounds and puts all of his weight on the lever. How much mechanical advantage did the lever provide to Jeff in lifting the rock?
a)
0
b)
2
c)
4
d)
8
37.
Using a lever, Joe is able to lift a 10,000 N car off of the ground with a force of 1000 N. What is the mechanical advantage of the lever?
a)
1
b)
10
c)
100
d)
1000
38.
A 16 N force is applied to an object and 96 J of work is done. How far was the object moved?
a)
6 m
b)
16 m
c)
80 m
d)
1536 m
39.
A watt is defined as ___________
a)
One joule per second
b)
One horsepower per second
c)
A force of one pound over a distance of one foot
d)
A force of one newton over a distance of one meter
40.
Resistance between effort and fulcrum.
a)
first-class lever
b)
second-class lever
c)
third-class lever
41.
Fulcrum between effort and resistance.
a)
first-class lever
b)
second-class lever
c)
third-class lever
42.
Effort between fulcrum and resistance.
a)
first-class lever
b)
second-class lever
c)
third-class lever
43.
Number of times a simple machine multiplies the effort force.
a)
resistance force
b)
work
c)
mechanical advantage
44.
Force that a person applies to a simple machine.
a)
effort force
b)
resistance force
c)
work
45.
What is a machine that uses only one movement called?
a)
Simple
b)
Basic
c)
Complex
d)
Compound
46.
The ratio of output work to input work is called _________________ .
a)
Really hard work
b)
Efficiency
47.
In the work equation, what unit is measures power?
a)
Joules
b)
Kinetic Energy
c)
Potential Energy
d)
Watts
48.
Which is NOT a wheel and axle?
a)
Doorknob
b)
Hammer
c)
Bike peddle
d)
Screwdriver handle
49.
What is the term that is used to describe the tendency of objects to remain at rest or in motion?
a)
inertia
b)
forces
c)
energy
d)
power
50.
What is the purpose of a simple machine?
a)
to change potential energy to kinetic energy
b)
to produce inertia
c)
to make work easier and use less force
d)
to test if forces are balanced
51.
what mechanical advantage is in a real situation?
a)
actual mechanical advantage
b)
ideal mechanical advantage
52.
When two or more simple machines work together, they are called a(n)____.
a)
compound machine
b)
screw
c)
simple machine
d)
effort machine
53.
An arrangement of pulleys designed to reduce the effort force is called a ____.
a)
block and tackle
b)
fixed pulley
c)
movable pulley
d)
simple pulley
54.
The fixed pulley in Figure 5-3B
a)
doubles the force required to lift the block
b)
decreases the force required to lift the block
c)
makes the block easier to lift by changing the direction of the force needed to lift it
d)
increases and changes the direction of the force
55.
What is the mechanical advantage if you lift a load of 300 newtons and you only push down with 50 newtons?
a)
250
b)
50
c)
60
d)
6
56.
What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J is produced by the 1machine?
a)
0.25 J
b)
26%
c)
386%
d)
3.86 J
57.
What is the efficiency of the machine if the input is 263 J and the output is 142 J?
a)
6.26%
b)
54%
c)
100%
d)
260%
58.
What is the efficiency of the machine if the input is 263 J and the output is 142 J?
a)
6.26%
b)
54%
c)
100%
d)
260%
59.
What is the mechanical advantage of the LAST inclined plane in the picture?
a)
1
b)
2
c)
3
d)
4
100 %
