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Chapter 14-Part 3
Test Description: Work and Simple Machines
Instructions: Answer all questions to get your test result.
1) x
A
effort time
B
efficiency
C
power
D
force
2) When two or more simple machines work together, they are called a (n) ________________.
A
simple machine
B
effort machine
C
a compound machine
D
screw
3) Which one of the following is NOT an example of work being done?
A
Lifting a book bag off the floor
B
pulling a sled across a field covered with snow
C
pushing a box from the bottom of a hill to the top of the hill
D
the Moon orbiting Earth
4) A fixed single pulley that is used to lift a block does which one of the following?
A
decreases the force required to lift the block
B
doubles 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
decreases the force required and changes the direction of the force required
5) A machine that changes only the direction of a force has a mechanical advantage of ___.
A
10
B
1
C
2
D
100
6) A lever with a mechanical adantage greater than 1 is used to ____________________.
A
increase distance
B
increase force
C
decrease force
D
change direction
7) A green plant has __________ energy.
A
chemical
B
electrical
C
kinetic
D
thermal
8) If you blow between two table tennis balls suspended about 2 cm apart, the balls will __________.
A
move toward each other
B
move away from each other
C
move back and forth
D
not move
9) A winding mountain road is an example of a
A
wedge
B
lever
C
wheel and axle
D
inclined plane
10) Three of the following simple machines are basically the same. The one that does NOT belong with the group is the ____________________.
A
wheel and axle
B
pulley
C
wedge
D
lever
11) As an object sinks in a fluid, the buoyant force _______________.
A
decrease
B
remains the same
C
increases
D
depends on the shape
12) A bar that is free to pivot about a fixed point is a _____________ .
A
fulcrum
B
ramp
C
wedge
D
lever
13) Unlike other forms of energy, thermal energy is hard to ______________.
A
transfer
B
use
C
store
D
generate
14) When a rubber band is stretched, it has ___________ energy.
A
kinetic
B
nuclear
C
potential
D
chemical
15) As the speed of a fluid increases, ____________.
A
the pressure decreases
B
the force decreases
C
the volume decreases
D
the pressure increases
16) The amount by which a machine multiplies an input force is called the ____________.
A
resistance force
B
mechanical advantage
C
fulcrum
D
efficiency factor
17) A slanted surface used to raise an object is a (n) _______________.
A
depends on your motion
B
decreased
C
increased
D
not changed
18) If you are standing on both feet and then stand on one foot, you have ___________ the pressure on the ground.
A
efficiency board
B
wedge
C
effort ramp
D
inclined plane
19) The work output of a machine divided by the work input is the ______________ of the machine.
A
resistance
B
effort
C
power
D
efficiency
20) A kite stuck in a tree has ______________ energy.
A
kinetic
B
chemical
C
potential
D
thermal
*select an answer for all questions
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