Review Sheet
... did not cover all parts of all chapters. The important vocabulary is listed for each chapter. You should make flash cards of the vocabulary to help you study. A set of questions follows the vocabulary in each chapter. Look for the answers to these questions in your book and in your notes. These ques ...
... did not cover all parts of all chapters. The important vocabulary is listed for each chapter. You should make flash cards of the vocabulary to help you study. A set of questions follows the vocabulary in each chapter. Look for the answers to these questions in your book and in your notes. These ques ...
2012 DSE Phy 1A
... A bomber aircraft is 1 km above the ground and is flying horizontally at a speed of 200 m s1. The aircraft is going to release a bomb to destroy a target on the ground. How long before flying over the target should the bomb be released ? Assume that the bomber aircraft and the target are in the sam ...
... A bomber aircraft is 1 km above the ground and is flying horizontally at a speed of 200 m s1. The aircraft is going to release a bomb to destroy a target on the ground. How long before flying over the target should the bomb be released ? Assume that the bomber aircraft and the target are in the sam ...
PracticeQuiz F&E
... a) Draw a vector representing the Force on q1 by q2 and label it F1. (1 pt) b) Draw a vector representing the Force on q2 by q1 and label it F2. (1 pt) c) Find the magnitude of F1. (Don’t forget units!) (3 pts) ...
... a) Draw a vector representing the Force on q1 by q2 and label it F1. (1 pt) b) Draw a vector representing the Force on q2 by q1 and label it F2. (1 pt) c) Find the magnitude of F1. (Don’t forget units!) (3 pts) ...
Weightlessness
Weightlessness, or an absence of 'weight', is an absence of stress and strain resulting from externally applied mechanical contact-forces, typically normal forces from floors, seats, beds, scales, and the like. Counterintuitively, a uniform gravitational field does not by itself cause stress or strain, and a body in free fall in such an environment experiences no g-force acceleration and feels weightless. This is also termed ""zero-g"" where the term is more correctly understood as meaning ""zero g-force.""When bodies are acted upon by non-gravitational forces, as in a centrifuge, a rotating space station, or within a space ship with rockets firing, a sensation of weight is produced, as the contact forces from the moving structure act to overcome the body's inertia. In such cases, a sensation of weight, in the sense of a state of stress can occur, even if the gravitational field was zero. In such cases, g-forces are felt, and bodies are not weightless.When the gravitational field is non-uniform, a body in free fall suffers tidal effects and is not stress-free. Near a black hole, such tidal effects can be very strong. In the case of the Earth, the effects are minor, especially on objects of relatively small dimension (such as the human body or a spacecraft) and the overall sensation of weightlessness in these cases is preserved. This condition is known as microgravity and it prevails in orbiting spacecraft.