Free Printable Check your Understanding Ch 4 ("Conceptual Physics" Hewitt)

Worksheets

Check your Understanding Ch 4 ("Conceptual Physics" Hewitt)

Total questions: 20

Worksheet time: 10mins

Name

Class

Date

speed =

$\frac{ending\ \ time\ -\ starting\ \ time}{2}$

$\frac{dis\tan ce}{time}$

$\Delta t$

distance x time

Which of the following are legitimate for describing speed?

miles/hour

light-years per century

centimeters per day

kilometers per minute

all of these

Instantaneous speed is

the first speed measured

speed measured with a stopwatch

the speed of an object at any instant

the most recent speed measured

Average speed is

not the fastest, but not the slowest either

the average of two or more instantaneous speeds

the total distance covered divided by time interval

what shows on a car's speedometer

Speed is a description of how fast an object moves; velocity is

the same as speed

something faster than speed

how fast AND in what direction

something that is always changing

Acceleration

applies to increases as well as decreases in speed

is related to how fast something is moving

is the rate at which velocity is changing

Acceleration =

going really fast

not a vector quantity

the amount speed changes

$\frac{change\ in\ velocity}{time\ interval}$

Free fall

is falling without accelerating

is an object moving under the influence of gravity only

involves air resistance

is falling at a constant speed

During each second of free fall

acceleration depends on an object's mass

an object falls about ten meters

the instantaneous speed on an object changes by about 10 m/s

10.

When acceleration is expressed as m/s²("meters per second squared" or "meters per second each second") the unit of time, the second, occurs twice -

once as part of speed, again for time interval during which speed changes

once in initial speed, again in final speed

and I've always wondered about that

we need to take speed twice to measure acceleration

11.

Instantaneous speed of an object falling from rest, after elapsed time t

depends on how high it's dropped from

$v\ =\ g\cdot t$

$d\ =\ \frac{1}{2}\ g\ t^2$

is doubled when mass is doubled

12.

Distance fallen from rest, after elapsed time t

depends on how high it's dropped from

$v\ =\ g\cdot t$

$d\ =\ \frac{1}{2}\ g\ t^2$

is doubled when mass is doubled

13.

The slope of the curve on a distance-versus-time

graph is

a straight line for an object in free fall

acceleration

speed

14.

The slope of the curve on a speed-versus-time

graph is

speed

acceleration

15.

Air resistance

has no effect on a parachutist

noticeably slows things with large surface area, less noticeably affects more compact objects

is futile

16.

An object is moving if

it's on a bus

its position relative to a fixed point is changing

it's heavier than air

17.

Suppose you take a trip that covers 180 km and takes 3 hours. Your average speed is

180 km/hr

90 km/hr

540 km/hr

60 km/hr

18.

Acceleration is defined as the CHANGE in

position divided by the time interval

velocity divided by the time interval

time it takes to move from one speed to another speed

time it takes to move from one place to another place

19.

An apple falls from a tree and one-half second later hits the ground. How fast is it falling when it hits the ground?

10 m/s

20 m/s

5 m/s

15 m/s

20.

You ride around a curve at a constant speed of 50 km/h - which of these is NOT true?

you are accelerating

you feel the effects of acceleration as your body tends to move toward the outside of the curve

your velocity is constant

your velocity vector is changing

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Check your Understanding Ch 4 ("Conceptual Physics" Hewitt)

Total questions: 20

Worksheet time: 10mins

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