Introduction to mechanical engineering lecture notes
... The instantaneous velocity of a particle in linear motion may be found by differentiating the position x with respect to the time variable t: v = dx/dt. The acceleration may be found by differentiating the velocity: a = dv/dt. By the fundamental theorem of calculus the converse is also true: to find ...
... The instantaneous velocity of a particle in linear motion may be found by differentiating the position x with respect to the time variable t: v = dx/dt. The acceleration may be found by differentiating the velocity: a = dv/dt. By the fundamental theorem of calculus the converse is also true: to find ...
1. Work & Friction H.Science9
... Warm-Up Questions 3. If a 20 N was pulled 100 meters, how much work was done? 4. You exert a vertical force of 72 Newtons to lift a box to a height of 1.0 meters in a time of 2.0 seconds. How much power is used to lift the box? 5. You lift a book from the floor to a bookshelf 1.0 meter above the gr ...
... Warm-Up Questions 3. If a 20 N was pulled 100 meters, how much work was done? 4. You exert a vertical force of 72 Newtons to lift a box to a height of 1.0 meters in a time of 2.0 seconds. How much power is used to lift the box? 5. You lift a book from the floor to a bookshelf 1.0 meter above the gr ...
Newton`s Laws - Ccphysics.us
... ____ 23. An elevator weighing 20 000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2? (g = 9.80 m/s2) a. 13 900 N c. 20 000 N b. 23 100 N d. 26 100 N ____ 24. A boxcar of mass 200 tons at rest becomes uncoupled on ...
... ____ 23. An elevator weighing 20 000 N is supported by a steel cable. What is the tension in the cable when the elevator is being accelerated upward at a rate of 3.00 m/s2? (g = 9.80 m/s2) a. 13 900 N c. 20 000 N b. 23 100 N d. 26 100 N ____ 24. A boxcar of mass 200 tons at rest becomes uncoupled on ...
Title - StairMaster Support
... Perform Tach test by entering diagnostics. If there is no Tach signal sensed on console o Check for .6 to .7 volts AC at the W-4 (Tach) terminal of the alternator. o If no voltage, remove the blue Tach wire from the alternator, while staircase is moving. Touch the Tach wire to the Field terminal. ...
... Perform Tach test by entering diagnostics. If there is no Tach signal sensed on console o Check for .6 to .7 volts AC at the W-4 (Tach) terminal of the alternator. o If no voltage, remove the blue Tach wire from the alternator, while staircase is moving. Touch the Tach wire to the Field terminal. ...
Part II
... Spring is compressed yA = - 0.12 m, below relaxed level, yB = 0. Ball gets to a max height yC = 20.0 m above relaxed end of spring. (A) If no friction, find spring constant k. (B) Find speed of ball at point B. Ball starts from rest. Speeds up as spring pushes against it. As it leaves gun, gravity s ...
... Spring is compressed yA = - 0.12 m, below relaxed level, yB = 0. Ball gets to a max height yC = 20.0 m above relaxed end of spring. (A) If no friction, find spring constant k. (B) Find speed of ball at point B. Ball starts from rest. Speeds up as spring pushes against it. As it leaves gun, gravity s ...
Lect-18
... counterclockwise, the torque will be positive If the turning tendency is clockwise, the torque will ...
... counterclockwise, the torque will be positive If the turning tendency is clockwise, the torque will ...
Final Exam Review
... This is a problem with constant acceleration, so we can use the constant acceleration formulas. A: True B: False False: As they get closer, the force of gravity increases and so does the acceleration 13. An unhappy student works out his aggression by attempting to knock down a large wooden bowling p ...
... This is a problem with constant acceleration, so we can use the constant acceleration formulas. A: True B: False False: As they get closer, the force of gravity increases and so does the acceleration 13. An unhappy student works out his aggression by attempting to knock down a large wooden bowling p ...
Levers
... In biomechanics we are interested in levers within the human body (bones) and extended levers which we use in sport (bats, clubs, sticks, racquets) ...
... In biomechanics we are interested in levers within the human body (bones) and extended levers which we use in sport (bats, clubs, sticks, racquets) ...
AP Physics I Dynamics
... Multi-Correct: Students will need to select all the correct answers to the question below in order to earn credit. 4. Which of the following is an inertial reference frame (i.e. a non-accelerating? A. Amusement Park Carousel (merry-go-round) B. Automobile traveling at a constant velocity C. Automobi ...
... Multi-Correct: Students will need to select all the correct answers to the question below in order to earn credit. 4. Which of the following is an inertial reference frame (i.e. a non-accelerating? A. Amusement Park Carousel (merry-go-round) B. Automobile traveling at a constant velocity C. Automobi ...
Concept Questions
... Answer 3. Energy is not conserved because there are energy losses due to kinetic friction. Angular momentum about the center of mass is not constant because the friction exerts a torque about the center of mass. Angular momentum about a fixed point on the ground is constant because the sum of the to ...
... Answer 3. Energy is not conserved because there are energy losses due to kinetic friction. Angular momentum about the center of mass is not constant because the friction exerts a torque about the center of mass. Angular momentum about a fixed point on the ground is constant because the sum of the to ...
Rolling resistance
Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation (or movement) of the wheel, roadbed, etc. is recovered when the pressure is removed. Two forms of this are hysteresis losses (see below), and permanent (plastic) deformation of the object or the surface (e.g. soil). Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy. Note that only the last of these effects involves friction, therefore the name ""rolling friction"" is to an extent a misnomer.In analogy with sliding friction, rolling resistance is often expressed as a coefficient times the normal force. This coefficient of rolling resistance is generally much smaller than the coefficient of sliding friction.Any coasting wheeled vehicle will gradually slow down due to rolling resistance including that of the bearings, but a train car with steel wheels running on steel rails will roll farther than a bus of the same mass with rubber tires running on tarmac. Factors that contribute to rolling resistance are the (amount of) deformation of the wheels, the deformation of the roadbed surface, and movement below the surface. Additional contributing factors include wheel diameter, speed, load on wheel, surface adhesion, sliding, and relative micro-sliding between the surfaces of contact. The losses due to hysteresis also depend strongly on the material properties of the wheel or tire and the surface. For example, a rubber tire will have higher rolling resistance on a paved road than a steel railroad wheel on a steel rail. Also, sand on the ground will give more rolling resistance than concrete.