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WorksheetsScience - Physics part 1
Total questions: 87
Worksheet time: 1hrs 8mins
All measurements are subject to (a) . All instruments used are influenced by external circumstances, and the accuracy of a measurement may be affected by the person making the reading.
A measurement is (a) if it is close to the accepted value.
The (a) of a measurement is the degree of exactness to which it can be reproduced. After taking a lot of measurements, you will find that they are close to each other.
When you read any measuring device, you always record the measurement by... reading the smallest division on the scale and then "guessing at" estimating, the tenth of the smallest division. These estimates create uncertainty!
True
False
significant digits also known as
(a)
The Balue that an answer is expressed in is determined by ___________ ______
(a)
Significant digits are all those digits obtained from a properly taken measurement: all of the certain digits plus the one estimated digit.
yes
No
Maybe
So
The number of significant digits indicates the precision of the measurement. More sig digs mean a less precise measurement
ture
False
Indicate the number of the significant digits:
321.0, 321, 0.321, 0.00321, 3.21 and 3.21 x 105
(a)
Exact numbers have an infinite number of significant digits because they do not involve estimated measurements.
Exact numbers are:
Whole numbers
Numbers that are definitons
e.g. 1000m = 1 km
1 dozen = 12
numbers that result from counting objects
e.g. 40 students
150 books
Real numbers
Indicate the number of significant digits.
12.7 m, 10.03 kg, 0.0034 s, 200 min, 2.746 x 1012
(a)
Rounding Off
answers must always be rounded off to correct significant digits as dictated in the question.
- When the first digit after those retained is less than 5, digits remain the SAME.
- When the first digit after those retained is 5 or greater, the last digits is increased by ONE.
Which one(s) of the following is(are) correct
3.9802 kg to 3 sig digs = 4.0 kg
0.003482 L to 3 sig digs = 0.00348 L
6.0838 g to 4 sig digs = 6.084
3.9802 to 2 sig digs = 4.0 kg
In science, you often deal with extremely large or small numbers. To express these without using a lot of zeros, scientists use scientific notaion
Scientific notation is always written in the form
a X 10b Where a is the coefficient and b is the exponent
- The coefficient tells you how significant (# of sig digs) the number is
- a is always a number between 1-9
- The exponent tells you where the decimal is
A zero or positive exponent tells you that the number is larger than one.
- Decimal is to the RIGHT of the first number
- Example: 1.23 X 104 = 12300
A negative exponent tells you that the number is smaller than one.
- Decimal is to the LEFT of the first number
- Example: 1.23 x 10-6 = 0.00000123
A negative exponent tells you that the number is smaller than one.
- Decimal is to the RIGHT of the first number
- Example: 1.23 X 104 = 12300
A zero or positive exponent tells you that the number is larger than one.
- Decimal is to the LEFT of the first number
- Example: 1.23 x 10-6 = 0.00000123
The result contains some significant digits
and some that are not because the
arithmetic was performed with uncertain
numbers. Our answer can NEVER be
more precise than the least precise value
we used in our calculations.
I have read it
I have read it
I have not read it
I already read it
2.9 + 8.276 + 13.45
(a)
42.3 g 16.452 g =
(a)
205.65 kg - 60kg =
(a)
2.3 x 0.05 x 2.0 =
(a)
When doing a series of calculations to arrive at an answer,
never round off your sub-steps. Only round your final
answer. If possible, keep the significant digits in your
calculator. A good rule of thumb is to write three more
significant digits than you’ll need to round to at the end.
yes
YEs
Yes
Yes
(a) occurs when an imaginary line joining an object to a reference point changes in length, direction or both
The term _______ ______ describes an object that moves at a constant rate in the same direction.
(a)
A car moved a distance of 5.0 m in a time of 1.2 s. It _______ exhibit uniform motion because it sped up and slowed down.
did
did not
The _______ _____ of the car is defined as a change in distance during a time interval.
(a)
An electric train is traveling at an average speed of 6.9 m/s for 4.0 s. Calculate the distance traveled by train
(a)
The independent variable is also called the ___________ ________. It is the one that the experimenter chanegs, or has control over.
It is always plotted on the horizontal, or x-axis.
When looking at a data table, the independent variable will be seen to increase at regular intervals.
(a)
The ___________ ________ is also called the manipulated variable. It is the one that the experimenter chanegs, or has control over.
It is always plotted on the horizontal, or x-axis.
When looking at a data table, the independent variable will be seen to increase at regular intervals.
(a)
The independent variable is also called the manipulated variable. It is the one that the experimenter chanegs, or has control over.
It is always plotted on the (a) , or x-axis.
When looking at a data table, the independent variable will be seen to increase at regular intervals.
The independent variable is also called the manipulated variable. It is the one that the experimenter chanegs, or has control over.
It is always plotted on the horizontal, or (a) .
When looking at a data table, the independent variable will be seen to increase at regular intervals.
The dependent variable is also called the __________ ________. It is the one that the experimenter measure.
Its value depends on the independent variable. It changes in response to the change that the experience makes to the manipulated variable.
It is always plotted don't the vertical, or y-axis.
When looking at a data table, the dependent variable will NOT be seen to increase at regular intervals.
(a)
The _________ ________ is also called the responding variable. It is the one that the experimenter measure.
Its value depends on the independent variable. It changes in response to the change that the experience makes to the manipulated variable.
It is always plotted don't the vertical, or y-axis.
When looking at a data table, the dependent variable will NOT be seen to increase at regular intervals.
(a)
The dependent variable is also called the responding variable. It is the one that the experimenter measure.
Its value (a) on the independent variable. It changes in response to the change that the experience makes to the manipulated variable.
It is always plotted don't the vertical, or y-axis.
When looking at a data table, the dependent variable will NOT be seen to increase at regular intervals.
The dependent variable is also called the responding variable. It is the one that the experimenter measure.
Its value depends on the independent variable. It changes in (a) to the change that the experience makes to the manipulated variable.
It is always plotted don't the vertical, or y-axis.
When looking at a data table, the dependent variable will NOT be seen to increase at regular intervals.
The dependent variable is also called the responding variable. It is the one that the experimenter measure.
Its value depends on the independent variable. It changes in response to the change that the experience makes to the manipulated variable.
It is always plotted don't the (a) , or y-axis.
When looking at a data table, the dependent variable will NOT be seen to increase at regular intervals.
The dependent variable is also called the responding variable. It is the one that the experimenter measure.
Its value depends on the independent variable. It changes in response to the change that the experience makes to the manipulated variable.
It is always plotted don't the vertical, or (a) .
When looking at a data table, the dependent variable will NOT be seen to increase at regular intervals.
The dependent variable is also called the responding variable. It is the one that the experimenter measure.
Its value depends on the independent variable. It changes in response to the change that the experience makes to the manipulated variable.
It is always plotted don't the vertical, or y-axis.
When looking at a data table, the dependent variable will (a) be seen to increase at regular intervals.
what are the components of a graph?
All graphs must have a title, in the y vs. x format.
Each axis must have the appropriate label
Symbol(abbreviation) for the units(in brackets)
EAch point that you place on the graph must be circles
(a) (m) measures that amount of steepness of a given line segment.
It maybe defined as the vertical change(rise) divided by the horizontal change(run)
Four types of slope
line rise to the right has a positive slope
Line fall to the right has a negative slope
Horizontal lines have a slope of zero
Vertical lines have an infinite slope(any line that doesn't move along the x-axis BUT stays fixed at one constant x0axis coordinate, making the change along the x-axis 0)
If there is a clear pattern among the points, draw the ____ ___ ____ that comes as close as possible to MOST of the points. The best fit line may be straight or curved.
(a)
The slope of a line on a distance-time graph is equal to the average speed of the object.
yes
No
The slope of a line on a speed-time graph indicates that an object is either speeding up or slowing down.
True
False
The area under the line of a speed-time graph determines that distance the object travels
True
False
A boat is traveling at a rate of 10 m/s for 5.0 s.
The area under the line forms a rectangle.
(a)
A (a) quantity has magnitude (size) only, but no direction.
Examples include: time, mass, distance and speed.
A (a) quantity has both magnitude and direction.
Examples include: displacement, velocity and force.
The (a) of an object is the separation between that object and a reference point. (which is usually "zero" on the scale)
The position of an object is the separation between that object and a _________ _____. (which is usually "zero" on the scale)
(a)
Position is a ? quantity
vector
scalar
(a) needs no frame of reference. YOu measure the distance between two objects by mearsuring their separation.
distance is a ? quantity
vector
scalar
The (a) of an object is defined as its change in position, relative to where it started.
Displacement is a ? quantity
vector
scalar
Distance vs. Displacement
Distance can't be negative
Displacement can.
Displacement is a vector quantity,
Distance is a scalar quantity.
Displacement used for velocity.
Distance used for speed.
They have no difference
We typically use the sign(+/-) or the direction([East]/[West])
True
False
The _______ ________ of the car is defined as a change in position during a time interval., .It is called an average velocity because it does not take into account speeding up and slowing down.
(a)
average velocity is a ? quantity
vector
scalar
There is no difference between distance-time graphs and position-time graphs.
True
False
(a) is defined as a change in velocity during a specific time interval.
A baseball thrown at 25.0 m/s strikes a catcher's mitt andd slows down to rest in 0.500 s. What is the magnitude of the ball's acceleration?
(a)
A curved line on a position-time graph means the object is accelerating.
True
False
The slope of a velocity-time graph is equal to the (a) of the object
Distance-Time graphs
slope = speed
area under the curve has no useful meaning
slope-velocity
area under the curve has not useful meaning
position-Time graphs
slope = speed
area under the curve has no useful meaning
slope-velocity
area under the curve has not useful meaning
Speed-time graphs
slope = change in speed
area under the curve = distance traveled
slope - acceleration
area under the curve = displacement
velocity-time graphs
slope = change in speed
area under the curve = distance traveled
slope - acceleration
area under the curve = displacement
A (a) can be descriebd as a push or a pull
The unit for force is the (a) symbol; N
one (a) equals one kilogram metre per second squared
When the forces acting on an object are balanced, it will remain at a constant speed( including zero)
True
False
If the forces acting on an object are balanced, then the object will accelerate.
True
False
Forces can be used to transfer energy or convert energy from one form to another
False
True
(a) : the abbility to do work
(a) : the transfer of energy from one object to another, or from one form of energy to another.
The S.I unit for work is the (a) (J)
The joule, like the Newton, is a ______ ____. To see how we break it down form it's fundamental units, we look at the formula: W = Fd
(a)
The direction the object moves must be in the same direction as the applied force, otherwise no work is being done
True
False
Do I do any work?
I carry a 2.0 kg wheel of cheese 12.0 m across the room.
Yes
No
I lift a 2.0 kg wheel of cheese from the ground to the top of a table.
Yes
No
I push against a wall with a force of 130 N for 10.0 s
Yes
No
A large crane does 2.2 x 104 J of work in lifting an object. How much energy is gained by the object
(a)
The work(or energy) input can be calculated using the formula
(a)
When doing work, sometimes some energy is lost as useless heat because of a resistive force, like friction.
True
False
The ____(or energy)_____ can be calculated using the formula W=Fd
(a)
The ____(or energy) ______ is the amount of energy the object or system ains as a result of the work being done.
(a)
To calculate work form a force-displacement graph, we calculate the area under the curve. By "under the curve," we mean the area between the line and the x-axis.
True
False
Let's say we wanted to calculate the work done on the object in moving it 10.0m with 5 N force. The area under the curve forms a rectangle which is
(a)
Smile face is positive acceleration and Sad face is negative acceleration
True
False
