AP 1 Midterm Review
... 8. Which of the following situations is impossible? (a) An object has velocity directed east and acceleration directed west. (b) An object has velocity directed east and acceleration directed east. (c) An object has zero velocity but non-zero acceleration. (d) An object has constant non-zero accele ...
... 8. Which of the following situations is impossible? (a) An object has velocity directed east and acceleration directed west. (b) An object has velocity directed east and acceleration directed east. (c) An object has zero velocity but non-zero acceleration. (d) An object has constant non-zero accele ...
Picket Fence Free Fall Acceleration
... forces can be acting; in particular, air resistance must be either absent or so small as to be ignored. When the object in free fall is near the surface of the earth, the gravitational force on it is nearly constant. As a result, an object in free fall accelerates downward at a constant rate. This a ...
... forces can be acting; in particular, air resistance must be either absent or so small as to be ignored. When the object in free fall is near the surface of the earth, the gravitational force on it is nearly constant. As a result, an object in free fall accelerates downward at a constant rate. This a ...
Ball launcher
... The world record for running 100 m is about 10 seconds. What is the average speed? Red 5 m/sec Yellow 0 m/sec Green 10 m/sec Blue 0.1 m/sec When is the runner accelerating? Red Mostly at the very beginning of the race Yellow The acceleration is constant Green All the time, but more at the beginning ...
... The world record for running 100 m is about 10 seconds. What is the average speed? Red 5 m/sec Yellow 0 m/sec Green 10 m/sec Blue 0.1 m/sec When is the runner accelerating? Red Mostly at the very beginning of the race Yellow The acceleration is constant Green All the time, but more at the beginning ...
Slides A - Department of Physics | Oregon State
... If these represent the same thing, then the assumed Euler ...
... If these represent the same thing, then the assumed Euler ...
Rotational Motion
... • Radians are found by the following: Θ=(s/r) • s is the arc length of the circle • r is the radius of the circle • Radians are usually some multiple of pi. ...
... • Radians are found by the following: Θ=(s/r) • s is the arc length of the circle • r is the radius of the circle • Radians are usually some multiple of pi. ...
Lesson 22 notes – Circular Motion - science
... the seat, and gets pulled round to the left (providing there is sufficient friction). The upper half of your body tries to carry on in a straight line. Viewed from a point above the car, your upper half will be seen to be trying to follow a tangential path while the car turns to the left. Watching a ...
... the seat, and gets pulled round to the left (providing there is sufficient friction). The upper half of your body tries to carry on in a straight line. Viewed from a point above the car, your upper half will be seen to be trying to follow a tangential path while the car turns to the left. Watching a ...
Phys 110
... b. How many seconds will the ball take to get to the top of its path? c. How much time will the ball spend in the air? d. How far off the ground will the ball be at its highest point? e. How far horizontally will the ball travel? 10. A swing is designed so the ropes hang at an angle of 10 degrees fr ...
... b. How many seconds will the ball take to get to the top of its path? c. How much time will the ball spend in the air? d. How far off the ground will the ball be at its highest point? e. How far horizontally will the ball travel? 10. A swing is designed so the ropes hang at an angle of 10 degrees fr ...
Exercises - PHYSICSMr. Bartholomew
... 34. When an object is in free fall, the only force acting on the object is gravity . 35. Circle the letter of each statement about freely falling objects that is true. a. They all fall with the same acceleration. b. The net force acting on them is their weight. c. Their weight-to-mass ratios are alw ...
... 34. When an object is in free fall, the only force acting on the object is gravity . 35. Circle the letter of each statement about freely falling objects that is true. a. They all fall with the same acceleration. b. The net force acting on them is their weight. c. Their weight-to-mass ratios are alw ...
Force and Acceleration
... QUESTION 9: Compare the value of frictional force you just found with the value of the smallest falling weight. Is it smaller, bigger, roughly the same? Is this expected? ...
... QUESTION 9: Compare the value of frictional force you just found with the value of the smallest falling weight. Is it smaller, bigger, roughly the same? Is this expected? ...
Proper acceleration
In relativity theory, proper acceleration is the physical acceleration (i.e., measurable acceleration as by an accelerometer) experienced by an object. It is thus acceleration relative to a free-fall, or inertial, observer who is momentarily at rest relative to the object being measured. Gravitation therefore does not cause proper acceleration, since gravity acts upon the inertial observer that any proper acceleration must depart from (accelerate from). A corollary is that all inertial observers always have a proper acceleration of zero.Proper acceleration contrasts with coordinate acceleration, which is dependent on choice of coordinate systems and thus upon choice of observers.In the standard inertial coordinates of special relativity, for unidirectional motion, proper acceleration is the rate of change of proper velocity with respect to coordinate time.In an inertial frame in which the object is momentarily at rest, the proper acceleration 3-vector, combined with a zero time-component, yields the object's four-acceleration, which makes proper-acceleration's magnitude Lorentz-invariant. Thus the concept is useful: (i) with accelerated coordinate systems, (ii) at relativistic speeds, and (iii) in curved spacetime.In an accelerating rocket after launch, or even in a rocket standing at the gantry, the proper acceleration is the acceleration felt by the occupants, and which is described as g-force (which is not a force but rather an acceleration; see that article for more discussion of proper acceleration) delivered by the vehicle only. The ""acceleration of gravity"" (""force of gravity"") never contributes to proper acceleration in any circumstances, and thus the proper acceleration felt by observers standing on the ground is due to the mechanical force from the ground, not due to the ""force"" or ""acceleration"" of gravity. If the ground is removed and the observer allowed to free-fall, the observer will experience coordinate acceleration, but no proper acceleration, and thus no g-force. Generally, objects in such a fall or generally any such ballistic path (also called inertial motion), including objects in orbit, experience no proper acceleration (neglecting small tidal accelerations for inertial paths in gravitational fields). This state is also known as ""zero gravity,"" (""zero-g"") or ""free-fall,"" and it always produces a sensation of weightlessness.Proper acceleration reduces to coordinate acceleration in an inertial coordinate system in flat spacetime (i.e. in the absence of gravity), provided the magnitude of the object's proper-velocity (momentum per unit mass) is much less than the speed of light c. Only in such situations is coordinate acceleration entirely felt as a ""g-force"" (i.e., a proper acceleration, also defined as one that produces measurable weight).In situations in which gravitation is absent but the chosen coordinate system is not inertial, but is accelerated with the observer (such as the accelerated reference frame of an accelerating rocket, or a frame fixed upon objects in a centrifuge), then g-forces and corresponding proper accelerations felt by observers in these coordinate systems are caused by the mechanical forces which resist their weight in such systems. This weight, in turn, is produced by fictitious forces or ""inertial forces"" which appear in all such accelerated coordinate systems, in a manner somewhat like the weight produced by the ""force of gravity"" in systems where objects are fixed in space with regard to the gravitating body (as on the surface of the Earth).The total (mechanical) force which is calculated to induce the proper acceleration on a mass at rest in a coordinate system that has a proper acceleration, via Newton's law F = m a, is called the proper force. As seen above, the proper force is equal to the opposing reaction force that is measured as an object's ""operational weight"" (i.e., its weight as measured by a device like a spring scale, in vacuum, in the object's coordinate system). Thus, the proper force on an object is always equal and opposite to its measured weight.