Force & Motion The First Law: Force and Inertia Object remains at rest will remain at rest unless acted upon by unbalanced force. Object in motion will continue at constant speed and motion unless acted upon by unbalanced force. Force is an action that can change motion. A force is what we call a push or a pull, or any action that has the ability to change an object’s motion. Forces can be used to increase the speed of an object, decrease the speed of an object, or change the direction
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thermodynamics? 3. A laboratory room keeps a vacuum of 0.1 psi. What net force does that put on the door of size 6ft by 3ft? 4. What is the normal temperature of human body in degrees Celsius? Convert this temperature into F, R and K? 5. The “standard” acceleration (at sea level and 45° latitude) due to gravity is 9.80665 m/s2. What is the force needed to hold a mass of 2 kg at rest in this gravitational field? How much mass can a force of 1 N support? 6. A gasoline line is connected to a pressure
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Which formula is about the Newton’s Second Law? A. v= s/t B. G= mg C. F= μFN D. F= ma 4. A cellphone is on the table (the cellphone is motionless). Which of the following is correct? A. The cellphone has inertia. B. There is no force acting on the table. C. There is no force acting
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Unit 8 Assignment 1 20. Because the magnetic force which deflects the electrons is defined by F = q * v x B (v x B is the cross product of the 2 vectors), so: The force vector would always be perpendicular to both the v and B vectors. Since the force is perpendicular to the electron's velocity vector, and thus the path of the electrons, the work done by the field on the electrons is 0, because W = F*d*cos(theta), and theta=90 degrees, therefore cos(theta)=0, and W=0 If W = 0 then
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cancelled by the normal reaction force from the ground. The only other force existed is the friction between the car and the surface therefore it will be equal to the net force 2. According to the formula Fr = μN, the amount of the friction depends on two factors: the friction coefficient and the normal reaction force, both of which are fixed. Therefore the amount of friction is constant throughout the motion 3. According to Newton’s Second Law F = ma, a constant net force will result in a uniform acceleration
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Four fundamental forces: Strong nuclear (strength: 10^38) (Range: less than 10^-15) -Force that holds protons and neutrons together in a nucleus of an atom Electromagnetic (strength: 10^36) (Range: infinity) -Force caused by electric charges Weak nuclear (strength: 10^25) (Range: less than 10^-18) -force responsible for interactions involving elementary particles such as protons and neutrons Gravitational (strength: 1) (Range: infinity) -force of attraction between all objects *All of them
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m] 3. A soccer player kicks the ball toward a goal that is 16.8 m in front of him. The ball leaves his foot at a speed of 16.0 m/s and an angle of 28.0° above the ground. Find the speed of the ball when the goalie catches it in front of the net. [14.7 m/s] 4. The best leaper in the animal kingdom is the puma, which can jump to a height of 3.7 m when leaving the ground at an angle of 45°. With what speed must the animal leave the ground to reach that height? [12 m/s] 5. A fireman
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Force Diatra Farasha In physics, a force is any influence that causes an object to undergo a certain change, either concerning its movement, direction, or geometrical construction. It is measured with the SI unit of newtons and represented by the symbol F. In other words, a force is that which can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Force can also be described
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at rest will remain at rest unless acted upon by an outside force. Either way the object will not have an acceleration and since F=ma, and a=0 there must not be any forces acting on that object either with means the forces are in equilibrium. If an ice skater is moving forward at constant speed, the gravity force and normal force will equal each other in the y direction, and since the skater is moving at constant velocity there is no force in any other direction. On a smooth floor, why will girls
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has links to Greek philosopher Aristotle's concept of potentiality. Potential energy is associated with a set of forces that act on a body in a way that depends only on the body's position in space. This allows the set of forces to be considered as having a specified vector at every point in space forming what is known as a vector field of forces, or a force field. If the work of forces of this type acting on a body that moves from a start to an end position is defined only by these two positions
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