The purpose of this lab is to calculate buoyant
forces of objects
submerged in water.
The first step in the lab was to measure the mass of a metal cylinder, which was found to be 100g, and then to calculated it's weight, which was .98 newtons. Then next step was to measure the apparent weight of the cylinder when it is completely submerged in a bath of water using the formula Wa=ma*g , this was found to be 88.5grams. Knowing these two numbers, the buoyant force that

the water places on the object can be calculated using the formula Fb=W-Wa , Wa=.8673n W=.98n Fb=.1127n
Part 2 of this lab consisted of weighing an empty cup, which was 44grams. And then filling another cup up to a certain point the if any more water was added, it would spill out of a little opening in the cup, the water spilled out could be caught in the first cup. This is done so that the water spilled out can be weighed and compared to a calculated weight of which the water should be. After filling the cup, the cylinder was put into the cup , allowing the water to spill out and be caught in the first cup. After the water had spilled out it was weighed, which was 8.3g, converted to kg was .0083g. The weight of this displaced water in Newtons was 0.081423n.

The percentage error with the buoyant force from step one was calculated using, this resulted, using .114 for Fb and .0813 for Wdisp, a 28.7% error.
After completing this lab, it has become more apparent as to how to calculate buoyant
forces and how that information can be used.

...importance and application of pressure.
Pressure is defined as the force acting perpendicular to a unit area. It is the result of a force distributed over an area. A theater seat’s large padded seat and back offer a larger area to support your weight than a bicycle seat does. Thus, the theater seat exerts less pressure on you and is more comfortable than the bicycle seat. Many other everyday situations also involve pressure and it is not only about the theater or bicycle seat but as well as in fluids. To calculate pressure, divide the force by the area over which the force acts. There are three principles of pressure:
Pascal’s Principle.
-It was discovered by Blaise Pascal, a French mathematician, scientist, and philosopher in the year 1650. It is states that: Pressure exerted on a contained fluid is transmitted undiminished throughout the fluid, acting in all directions and perpendicular to the walls of the container.
Bernoulli’s Principle.
-It was discovered by the Swiss scientist Daniel Bernoulli (1700-1782). According to it, for steady fluid flow, where the velocity of the fluid is high, its pressure is low, and where the velocity is low the pressure is high.
Archimedes’ Principle.
-It was discovered by Archimedes, an ancient Greek mathematician who died in 212 B.C. According to this principle, an object immersed in a fluid experiences a buoyantforce that is equal in...

...HYDROSTATIC FORCE (EXPERIMENT 1)
INTRODUCTION
The determination of force which are exerted by liquid which are at rest on surface immersed in liquids. From the study by hydrostatic, the following principles have been established :
a) There are no shear stress present when the fluid is not in motion.
b) The pressure exerted by a fluid under hydrostatic conditions. This pressure acts perpendicular to an immersed surface.
c) Hydrostatic pressure various linearly, increasing with an increase in depth.
OBJECTIVES
1. To determine the hydrostatic thrust on a plane surface partly immersed in water.
2. To determine the position of the line of action of the thrust.
3. To compare the position determined by experiment with the theoretical position .
4. To verify the formula for calculating hydrostatic thrust.
THEORY
When the quadrant is immersed in water it is possible to analyze the forces acting on the surfaces of the quadrant as follows:
The hydrostatic force at any point on the curved surface is normal to the surface and therefore resolves through the pivot point because this is located at the origin of the radii. Hydrostatic forces on the upper and lower curved surfaces therefore have no net effect – no torque to affect the equilibrium of the assembly because all of these forces pass through the pivot.
The forces on the sides of the...

... Buoyancy, Force, and Gravity
Purpose: To check the buoyancy of the object measured in Newton.
Hypothesis: I think the force pulling down on the clay might be heavier then the container with water and clay.
Apparatus:
1 small beaker (mL)
1Graduated cylinder
1 container
1 small portion of clay
can
Spring scale (newtons)
Tap water
1 Cloth
Method:
First, hang the clay on the hook of the Newton spring scale.
Secondly, record the measurements.
Thirdly, get a container, fill it with water and put the clay in it. The water should be a little bit above the clay not completely filled.
Fourthly, hang the container on the Newton spring scale and record the measurements.
Fifthly, get a can, put a beaker inside it and fill the beaker with water. Put the clay inside it and let the water leak out.
Sixthly, use the graduated cylinder to pour in the leaked water and get rid of the remaining water from the beaker.
Seventhly, record the measurements of this displacement method.
Eighthly, clean any remaining water and the lab station worked on.
Observations:
1. The force pulling down on the clay using Newton spring scale: 0.29 n
2. Container with clay and water in it: 1.0
3. Weight water from the weight in air subtracted: 0.29 – 1.0 = 0.71 n
4. Displacement method: volume of water displaced by clay divided by 100 = 0.09 n
5. The numbers are close by 0.62 n.
The Archimedes principle:
The principle is that...

...questions: force and motion I problem 1 The figure below is an overhead view of a 12 kg tire that is to be pulled by three ropes. One force (Fl, with magnitude 50 N) is indicated. Orient the other two forces F2 and F3 so that the magnitude of the resulting acceleration of the tire is least, and find that magnitude if (a) F2 = 30N, F3= 20 N; (b) F2= 30 N, F3 = 10 N; and (c) F2 = F3 = 30 N.
problem 2 A weight-conscious penguin with a mass of 15.0 kg rests on a bathroom scale (see figure below). What are (a) the penguin's weight W and (b) the normal force N on the penguin? (c) What is the reading on the scale, assuming it is calibrated in weight units?
problem 3 If a nucleus captures a stray neutron, it must bring the neutron to a stop within the diameter of the nucleus by means of the strong force. That force, which "glues" the nucleus together, is essentially zero outside the nucleus. Suppose that a stray neutron with an initial speed of 1.4 X 107 m/s is just barely captured by a nucleus with diameter d = 1.0 X 10-14 m. Assuming that the force on the neutron is constant, find the magnitude of that force. The neutron's mass is 1.67 X 10-27 kg.
problem 4 Sunjamming. A "sun yacht" is a spacecraft with a large sail that is pushed by sunlight. Although such a push is tiny in everyday circumstances, it can be large enough to send the spacecraft outward from...

...horizontal surface. A force of 12 N is applied to the
block and it accelerates at 4.0 m s –2.
4.0 m s–2
wooden block
12 N
What is the magnitude of the frictional force acting on the block?
A
B
9.6 N
C
14 N
D
2
2.4 N
16 N
A submarine descends vertically at constant velocity. The three forces acting on the submarine
are viscous drag, upthrust and weight.
Which relationship between their magnitudes is correct?
A
B
weight = drag
C
weight < upthrust
D
weight > upthrust
A ruler of length 0.30 m is pivoted at its centre. Equal and opposite forces of magnitude 2.0 N are
applied to the ends of the ruler, creating a couple as shown.
2.0 N
50°
ruler
pivot
50°
2.0 N
What is the magnitude of the torque of the couple on the ruler when it is in the position shown?
A
0.23 Nm
B
0.39 Nm
C
0.46 Nm
D
0.60 Nm
Compiled nd rearrnged by Sjit Chandra Shakya
3
weight < drag
2
4
A ball falls from rest through air and eventually reaches a constant velocity.
For this fall, forces X and Y vary with time as shown.
force Y
force X
0
0
0
time
0
time
What are forces X and Y ?
force X
A
air resistance
resultant force
B
air resistance
weight
C
upthrust
resultant force
D
upthrust
weight...

...Physics notes
Force is an agent which produces or tends to produce motion in an object, stops or tends to stop , motion of an object
Newton's 1st law of motion:
If an object is at rest, will remain at rest until or unless an external force act on it. If an object is in motion , it continues its motion until or unless an external force act on it
Newton's 1st law of motion is also called first law of inertia.
Inertia:
The tendency of an object to resist any change in its state of motion or rest is called inertia.
Inertia is the measure of mass in an object.
Heavier object are difficult to bring in motion or in rest because they've greater inertia.
Newton's 2nd law of motion:
Force produces acceleration in an object in its own direction. The acceleration is directly proportional to the force and inversely proportional of the mass of the object.
Resultant force is unbalanced force.
F=ma , where F is the resultant force.
Q: the mass of a boy n his bicycle is 30kg, wants to accelerate at 1.5per sec square if the opposing force is acting on both is 40N
Find the force needed for this acceleration.
Q2: a car of weight 50,000N is moving with a uniform speed of 20meters per sec
The opposing force is acting on the car is 600N
Find:
a: the force applied by the engine
b: if the engine...

...Force vs. Area
Connor Blackmon
Chemistry I H, 1st Period
Mrs. Kris Clements
October 18, 2012
Problem
Will a balloon pop if it is places on a bed of nails and pressure is applied?
Hypothesis
If a balloon is placed on a bed of nails and a force is applied, then the balloon will burst.
Variables
Independent variable- Force applied to the balloon and number of nails
Dependent variable- Does the balloon burst?
Materials
14 inch by 14 in by .75 in plywood board x2
196 nails
4 rods (14 inches tall)
Ruler
Pen
Drill
10 latex and 10 rubber balloons
Weights (1 lb, 5 lbs, 10 lbs; multiple of each weight)
Procedures:
Assembling the Board:
Using a pen and ruler, every one inch make a mark on one of the boards, these marks should be parallel to each other
use a drill to place a nail at each one of the points made on the board, all nails will be used
On the four corners drill a hole for a 14 inch rod facing the same way as the nails
Using the drill again, make four holes in the corners of the other plywood board for the rods to slide through
Experiment Procedures:
Inflate the rubber balloons to 11 inches in diameter, all balloons should be plus or minus .2 of an inch in diameter
Place rubber balloon on the middle of the bed of nails
Slide plywood board trough the rods to sandwich to balloon
Record if the balloon pops or not and weight applied to balloon...