Phys Sci Ch 14 A: Question Preview (ID: 19021)

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A 1,125 W motor might also be rated as a
a) 0.5 horsepower motor
b) 4 horsepower motor
c) 3 horsepower motor
d) 1 horsepower motor

If you know the input distance and the output distance of a machine, which of the following can you calculate?
a) work
b) actual mechanical advantage
c) ideal mechanical advantage

An example of a compound machine is a
a) ramp
b) crowbar
c) bicycle

If you perform 50 joules of work lifting a 5 N box from the floor to a shelf, how high is the shelf?
a) 10 m
b) 20 m
c) 1.5 m

The efficiency of a machine is always less than 100% because
a) a machine cannot have an IMA greater than 1
b) the work input is too small
c) some work input is lost to friction

The SI unit of power is the
a) newton-meter
b) newton
c) watt

A mechanical device requires 300 J of work to do 150 J of work in lifting a crate. What is the efficiency of the device?
a) 50%
b) .5%
c) 80%

If you have to apply 10 N of force on a crowbar to lift a rock that weighs 100 N, what is the actual mechanical advantage of the crowbar?
a) 0.1
b) 10
c) 360

A force acting on an object does no work if
a) a machine is used to move the object
b) the force is not in the direction of the object's motion
c) the force is greater than the force of friction

An inclined plane reduces the effort force by
a) increasing the work
b) increasing the distance through which the force is applied
c) reducing the effort distance

A machine is a device that can multiply
a) work
b) power
c) force

The actual mechanical advantage of a machine
a) is less than the ideal mechanical advantage of the machine
b) cannot be less than 1
c) decreases as the input distance increases

3730 watts equals about how many horsepower?
a) 20
b) 10
c) 5

What is the unit of work?
a) joule
b) newton/meter
c) watt

How can a machine make work easier for you?
a) by increasing the work done by the machine
b) by decreasing the amount of work you do
c) by changing the direction of your force

An ax is an example of a(n)
a) inclined plane
b) wedge
c) lever

If you exert a force of 10 N to lift a box a distance of .2 m, how much work do you do?
a) 0.1 J
b) 10.9 J
c) 2.0 J

If you exert a force of 300 N to walk 10 m up a flight of stairs in 10 sec, how much power do you use?
a) 25,200 W
b) 300 W
c) 19 W

Reducing friction in a machine
a) decreases the work output
b) decreases its actual mechanical advantage
c) increases its efficiency

In which of the following is an example of a wheel and axle?
a) hammer
b) an automobile steering wheel
c) a jar lid

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