Chapter 14-Part 3 Question Preview (ID: 29724)
Work And Simple Machines.
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The work output of a machine divided by the work input is the ______________ of the machine.
a) power
b) efficiency
c) effort
d) resistance
A kite stuck in a tree has ______________ energy.
a) kinetic
b) potential
c) chemical
d) thermal
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) inclined plane
d) wedge
A slanted surface used to raise an object is a (n) _______________.
a) not changed
b) increased
c) decreased
d) depends on your motion
The amount by which a machine multiplies an input force is called the ____________.
a) efficiency factor
b) resistance force
c) mechanical advantage
d) fulcrum
Unlike other forms of energy, thermal energy is hard to ______________.
a) store
b) use
c) transfer
d) generate
When a rubber band is stretched, it has ___________ energy.
a) potential
b) kinetic
c) chemical
d) nuclear
As the speed of a fluid increases, ____________.
a) the pressure decreases
b) the volume decreases
c) the pressure increases
d) the force decreases
As an object sinks in a fluid, the buoyant force _______________.
a) increases
b) depends on the shape
c) decrease
d) remains the same
A bar that is free to pivot about a fixed point is a _____________ .
a) lever
b) fulcrum
c) ramp
d) wedge
A winding mountain road is an example of a
a) wedge
b) lever
c) wheel and axle
d) inclined plane
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) lever
c) pulley
d) wedge
A lever with a mechanical adantage greater than 1 is used to ____________________.
a) change direction
b) increase distance
c) increase force
d) decrease force
A green plant has __________ energy.
a) electrical
b) thermal
c) chemical
d) kinetic
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) move toward each other
d) not move
A machine that changes only the direction of a force has a mechanical advantage of ___.
a) 1
b) 2
c) 10
d) 100
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) makes the block easier to lift by changing the direction of the force needed to lift it
c) decreases the force required and changes the direction of the force required
d) doubles the force required to lift the block
Which one of the following is NOT an example of work being done?
a) pulling a sled across a field covered with snow
b) Lifting a book bag off the floor
c) pushing a box from the bottom of a hill to the top of the hill
d) the Moon orbiting Earth
x
a) efficiency
b) effort time
c) force
d) power
When two or more simple machines work together, they are called a (n) ________________.
a) a compound machine
b) screw
c) effort machine
d) simple machine
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