NEW
Font size
S
M
L
XL
WorksheetsPhysical Science: Work and Machines
Total questions: 37
Worksheet time: 26mins
Name
Class
Date
1.
True or false
You do work only when you exert a force on an object and move it
You do work only when you exert a force on an object and move it
a)
true
b)
false
2.
Two factors that determine work are
a)
size of the force, and distance
b)
size of the force, and type of force
c)
mass, and distance
3.
units of force are
a)
netwons
b)
grams
c)
joules
d)
meters
4.
units for work are
a)
netwons
b)
joules
c)
meters
d)
seconds
5.
if you push a cart with a force of 60 N for 2 m... how much work have you done
a)
120 J
b)
30 J
c)
120 N
d)
30 N
6.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
7.
45J of work were done on the object that moved 5M. How much force was applied to the object?
a)
8N
b)
225N
c)
9N
d)
0N
8.
If the mystery machine moves 100 meters how much work is done?
a)
130,000,000J
b)
70,000J
c)
100,000J
d)
30,000J
9.
If Jay Loppy pushes his van 20 meters how much work is done?
a)
2,000J
b)
40,000J
c)
10,000J
d)
800,000J
10.
A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.
a)
wedge
b)
screw
c)
lever
d)
inclined plane
11.
An inclined plane wrapped around a rod forms this simple machine
a)
lever
b)
pulley
c)
screw
d)
wedge
12.
A simple machine that consists a rigid bar that pivot about a fixed point
a)
lever
b)
pulley
c)
wheel and axle
d)
fulcrum
13.
An axe is an example of a
a)
pulley
b)
inclined plane
c)
screw
d)
wedge
14.
A seesaw is an example of a
a)
wedge
b)
lever
c)
inclined plane
d)
pulley
15.
A device that has two or more simple machines working together
a)
fulcrum
b)
pulley
c)
compound (complex) machine
d)
motor
16.
Stairs
a)
wedge
b)
pulley
c)
inclined plane
d)
wheel and axle
17.
Which is not a type of simple machine?
a)
spring
b)
screw
c)
pulley
d)
wedge
18.
What type of simple machine is this?
a)
wheel and axle
b)
gear
c)
lever
d)
inclined plane
19.
The fixed point on the lever is called
a)
load
b)
resistance
c)
bar
d)
fulcrum
20.
Which of the following does a simple machine do?
a)
allows the users to apply less force over a longer distance
b)
reduce the amount of force needed to do work
c)
change the direction of the applied force
d)
all of the above
21.
A _______ pulley is used to reduce the amount of effort force.
a)
movable
b)
fixed
c)
single
22.
A _____ pulley only changes the direction of the force.
a)
movable
b)
fixed
c)
alternate
23.
How can an incline plane reduce the amount of force required to lift an object?
a)
increase the length of the ramp
b)
increase the height of the ramp
c)
decrease the length of the ramp
24.
Why is no machine 100% efficient?
a)
some of the input energy is converted to mechanical energy in the environment
b)
some of the input energy is converted to chemical energy in the environment
c)
some of the input energy is converted to heat energy in the environment
d)
All machines can be 100% efficient
25.
Which of the following is NOT an example of a compound machine?
a)
scissors
b)
fishing pole
c)
ramp
26.
Scissors are an example of a compound machine. What simple machines are used to make up this compound machine?
a)
2 levers and 2 inclined planes
b)
2 levers and 2 pulleys
c)
2 pulleys and 2 inclined planes
27.
Which one is a resistance force?
a)
me pulling the leash
b)
you pushing a rock
c)
me pushing your desk
d)
weight of a car you are pushing
28.
Which one is an effort force?
a)
blocks in a wagon
b)
person pushing a carriage
c)
friction
d)
Mrs. Herman
29.
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
30.
A machine has a work output of 8 joules and requires 10 joules of work input to operate. What is the machine's efficiency?
a)
8 J
b)
10 J
c)
80%
d)
800%
31.
Lucas has been challenged to increase the efficiency of a device he is redesigning. His goal is 90% efficiency. The work input of the device is fixed at 10 joules, so Lucas is trying to improve work output. How many joules of work output should Lucas aim for to attain his goal of 90% efficiency?
a)
9 Joules
b)
900 Joules
c)
0.9 Joules
d)
25
32.
What is effort (input) force?
a)
the force required by a machine in order to accomplish work (the force you put on the machine)
b)
the force which an effort force must overcome in order to do work on an object via a simple machine.
c)
the force the machine exerts on a object
d)
the output work times the input distance
33.
What is resistance (output) force?
a)
the force required by a machine in order to accomplish work (the force you put on the machine)
b)
the force which an effort force must overcome in order to do work on an object via a simple machine.
c)
the force the machine exerts on a object
d)
the output work times the input distance
34.
What is the mechanical advantage of this pulley system?
a)
2
b)
3
c)
4
d)
5
35.
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
36.
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
37.
The mechanical advantage of this inclined plane is.....
a)
2.4
b)
3.4
c)
4.4
Reset
