Questions: 1. Read each description below. Choose the force diagram (free-body diagram) that best represents the description. The forces are acting on the object in red type. You may neglect the effects of air resistance. |

A. Mindy's Christmas tree ornament hangs motionless on a tree.| B. Corey's Christmas tree ornament is falling to the floor.| C. A ball thrown by Ginger is moving upward through the air.| D. A ball dropped by Melissa is falling downward toward the floor.| E. Matt's book is motionless on a table.|

F. A ball that was thrown upward by Yvonne is at the top of its path.|

2. Read each description below. Choose the force diagram (free-body diagram) that best represents the description. You may neglect the effects of air resistance. |

A. Mark's physics book is on the desk. Mark pushes horizontally (from the side) on the book, but the book does not move.| B. Kendall's physics book is on the desk. Kendall pushes horizontally (from the side) on the book, and the book moves across the desk at a constant speed.| C. Jenny pushes a cart at constant velocity down the grocery store aisle.| D. Eddy is driving his Camaro down a straight, level road while on cruise control.| E. Ryan is accelerating his Dakota down a straight, level road.| F. Jackie's Viper is parked on the shoulder of the road while she changes a flat tire.|

...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...

...* Constant speed = no acceleration = sum of all net forces is zero
* An object in orbit around the earth is not truly weightless
* Sitting half as far away from your class mate the gravitation force is four times as strong. (re2)
* Newton’s First Law- inertia an object that is not moving will remain at rest (ex: and apple hanging from a tree)
* The reason you head feels like it jerks back ward is when pulling away from a stop sign is due to Newtons first law
* If two forces that are identical in strength but exactly opposite in direction act on the same object that object will not necessarily be motionless
* When drawing a FBD, the net force must not be included
* 2 people pushing an object across a frictionless surface will result in twice the acceleration than if only one was pushing. Assume the object slides in both cases and both people push with same force (true)
*
Types of forces:
* Dynamics: the study of motion
* No movement forces are balanced
* Applied Force: a force that results when one object makes contact with another (pushes or pulls it)
* Tension: a pulling force, with a rope/ string
* Normal force: only when in contact with something ie. The ground. Points away from surface
* Friction: opposes the sliding of two surfaces cross one...

...LAB: Force Lab
Research Question: How does the change in mass of an object affect the force and time while the object is moving down a height of 31cm?
Hypothesis: My prediction is that the greater the mass of the toy car the larger the force of gravity, as the product of the masses of two objects increases, the force of gravity that attracts them toward each other increases. According to Newton’s law of universal gravitation, “gravity and mass are directly proportional” hence, creating a greater force of gravity and a faster speed. As well as, Newton’s second law of motion is: “Force = Mass x Acceleration” and if the mass is larger the force will be greater.
Newton’s law of universal gravitation.
Newton’s law of universal gravitation.
Variables:
IV (Independent Variable): The mass of the car (kg)
DV (Dependent Variable): The time (seconds)
CV (Control Variable): same timer , same distance travelled (1.2 m), same weighing scale, height of the ramp (31 cm), surface of ramp, the same toy car.
Materials:
* A timer set to 0.00 (seconds)
* A weighing scale
* A measuring tape (meters)
* A toy car
* 5 weights, each measuring 10 grams
* A wooden ramp
* Laboratory Jack
* Scotch tape
* Calculator (for the calculations)
* Pencil/Pen
* Paper (for results table)
Method:
1. Get into groups of three or four...

...letter of the BEST answer
____ 1. The attractive force, between the earth and a body.
A) force B) distance C) mass D) weight
____2. The acceleration of a body when it falls freely at the surface of the earth (about 9.8 meter/sec2) or (32 ft/sec2) is due to:
A) acceleration B) acceleration due to gravity C) average speed D) distance
____ 3. An airplane is observed to travel a distance of 300 miles in two hours without changing its rate of speed. What is its speed?
A) 200 mi/hr B) 175 mi/hr C) 150 mi/hr D) 195 mi/hr
____ 4. If you drive your car at a steady speed covering 100 miles in 1.5 hours, what was your speed?
A) 46.2 mi/hr B) 57.9 mi/hr C) 66.7 mi/hr D) 49.7 mi/hr
____ 5. A mosquito flying at an incredible 10 meter/sec becomes blind and collides against a wall (zero speed) in a matter of 1/2 sec. What is the deceleration of the mosquito during this tragic period of time?
A) 11 meter/sec2 B) 15 meter/sec C) 20 meter/sec2 D) 17 meter/sec2
____6. What is the acceleration of a bird which is observed to change constantly its speed by 5 ft/sec every 4 seconds of time:
A) 1.25 ft/sec2 B) 2.25 ft/sec2 C) 1.025 ft/sec2 D) 5.10 ft/sec2
____7. What acceleration do you expect to impart to a block of mass 2.5 slugs resting on a frictionless plane if you push it with a force...

...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...

...Definition of Force
A force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces onlyexist as a result of an interaction.
Velocity, Acceleration, Momentum, and Impulse
Velocity, in physics, is a vector quantity (it has both magnitude and direction), and is the time rate of change of position (of an object). However, quite often when you read ‘velocity’, what is meant is speed, the magnitude of the velocity vector (speed is a scalar quantity, it has only magnitude). For example: escape velocity (the minimum speed an object needs to escape from a planet, say); note that this can be easily turned into a velocity, by adding ‘in the direction radially out from the center of the planet’, and that this direction is sometimes implied (if not actually stated).
Velocity is a vector measurement of the rate and direction of motion or, in other terms, the rate and direction of the change in the position of an object. The scalar (absolute value) magnitude of the velocity vector is the speed of the motion. In calculus terms, velocity is the first derivative of position with respect to time.
The most common way to calculate the constant velocity of an object moving in a straight line is with...

...
FORCE AND MOTION
Ronald Steven DuBois
5th Grade
St. Michael's Catholic School
2009
TABLE OF CONTENTS
1. Abstract
2. Introduction
3. Background Information
4. Procedure
6. Data and Observations
7. Results
8. Conclusion
9. Bibliography
ABSTRACT
I thought it would be fun to fling things like raw eggs and rocks with a catapult. Guess
what, it was! By flinging these items I tried to find out if heavier things would travel farther than
lighter ones. Basically how force effects motion.
With the catapult as the force, I sent items soaring, after weighing them, and then
recorded how far the items travelled. This showed me how Newtons Three Laws of Motion
work.
Force causes change is Newton's First Law of Motion which I saw from the catapult
flinging the items.
My hypothesis that heavier items would go farther was not correct, because Newton's
Second Law of Motion says that the force applied is equal to mass times acceleration. For
instance, if you push a skateboard it will roll away, but if you push a car with the same amount
of force, it will barely move. So heavier items do not travel farther.
Newton's Third Law of Motion is that for every action there is an equal and opposite
reaction. In my experiements this is shown clearly by the...