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