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| SI unit for Work and Energy |
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| Joule (J) which equals (N/m) |
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| Give Prefix and abbreviation for powers of ten (9, 6, 3, -2, -3, -6, -9, -12) |
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| Giga (G or B), Mega (M), Kilo (K), Centi (c), Milli (m), Micro (u), Nano (n), Pico (p) |
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| Give Sin value for the following angles: 0, 30, 45, 60, 90, 180 |
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Definition
| 0, 1/2, !2/2=0.7, !3/2=0.87, 1, 0 |
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| Give Cos value for the following angles: 0, 30, 45, 60, 90, 180 |
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| 1, !3/2=0.87, !2/2=0.7, 1/2, 0, -1 |
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| What is the difference between a scalar quantity and a vector quantity? |
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| A scalar quantity has magnitude but no direction. A vector quantity has magnitude and direction. |
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| Vector or Scalar: distance, speed, displacement, mass, velocity, force, acceleration, energy Pressure, mass |
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| distance=s, speed-s, displacement=v, mass=v, velocity=v, force=v, acceleration=v, energy=s, Pressure=s, mass=s |
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| (T/F) The sum of two vectors is the resultant of the vectors |
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| A person walks 2 miles north then turns around and walks 3 miles south. Total time elapsed-1 hour. Find the distance, displacement, avg. velocity, avg. speed |
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Definition
distance=5 miles
displacement=1 mile south
avg. velocity=1mi/hr (S)
avg. speed=5 mi/hr |
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| Average acceleration (a)= |
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| change in velocity / change in time |
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| For a body under constant acceleration, v= |
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| v=initial velocity + (a)(t) |
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| Is weight a vector or scalar quantity? What is the formula for calculating weight? |
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| What is Newton's First Law? |
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| 1. Law of inertia; body in motion or at rest stay in motion or at rest unless a net force acts upon it. |
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| What is Newton's Second Law of Motion? |
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| What is Newton's third law of motion? |
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| To every force there is an equal and opposite force; Fb = =Fa |
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| What are the formulas for the initial horizontal and vertical velocities of a projectile launched with speed v at an angle of theta to the horizontal? |
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Definition
Horizontal velocity= v(cos theta)
Vertical velocity = V(sin theta) |
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| What does the total horizontal distance, x, traveled by a projectile equal? |
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| x = (initial horizontal velocity)(time in the air) |
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| What is the formula for gravitational force? F=? |
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| F = [(gravity)(mass of obj. 1)(mass of obj. 2)] / (distance between the two objects squared) |
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| If the distance between two objects is doubled, by how much is the force of gravity increased or decreased? |
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Definition
| It would decrease by a factor of 4 (2 squared) |
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| (T/F) A body in translational equilibrium has a net force moving it at a constant velocity. |
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Definition
| False, a body in translational equilibrium has no net force acting on it. |
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| If a lever arm is halved, by how much does the torque increase or decrease? |
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Definition
| Torque would decrease by half. |
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| Formula for calculating torque = |
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| torque = [(r, distance between force and axis of rotation)(F, force)(sin theta)] |
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| When calculating torque, which rotation direction is considered positive and which negative? |
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Definition
Counterclockwise=positive
Clockwise = negative |
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| (T/F) For rotational equilibrium to occur, the sum of all torques acting on a body must be zero. |
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| Define Translational motion. |
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| motion in which the position of the object's center of mass changes as a function of time |
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| Formula for the force of static friction = |
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| static friction = (coefficient of static friction)(Normal force, N) |
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| Formula for the force of kinetic friction = |
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| kinetic friction =(Coefficient of kinetic friction)(Normal force, N) |
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| What is the formula for centripetal acceleration for a body in uniform circular motion? |
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| a = (Velocity squared) / (radius, r) |
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| What is the formula for centripetal force for a body in uniform motion? |
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| F = ma = [(mass)(velocity squared)] / (radius) |
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| (T/F) For a planet orbiting a star, the centripetal force is equal to the gravitational force. |
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| What is the formula for Work? |
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Definition
| W = (Force)(distance)(cos theta) |
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| What is the unit of work? |
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Definition
| Joule (J) which is equal to a N/m |
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| What is the formula for power? |
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| What is the unit of power? |
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| Watt (W) which is equal to (1 Joule/sec) |
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| What is the formula for kinetic energy? |
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KE = (mv squared)/2
***mv is mass times velocity |
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| What are the units of Kinetic energy? |
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| What is the formula for gravitational potential energy? U = ? |
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| U = (mass)(gravity)(Height) |
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| What are the units of gravitational potential energy? |
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Definition
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| (T/F) The total mechanical energy of a body is the sum of its kinetic and potential energies. |
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| Is total mechanical energy a constant if the only forces that act on a body are conservative (E=K+U=constant)? |
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| If only conservative forces act on a body then change in E = 0. |
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| What is the formula for momentum? p=? |
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| What is the formula for impulse? J = ? |
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| J = (force)(time) = Ft=mv-(initial mv) =change in p |
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| Is kinetic energy conserved in a completely elastic collision? |
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| (T/F) Net external force must equal zero for conservation of momentum to occur |
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| What is the formula for the center of mass for two masses, m1 and m2, lying along the x-axis at points x1 and x2? X=? |
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| X = [(m1x1)+(m2x2)] / (m1 + m2) |
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| (T/F) Momentum is not conserved in an inelastic collision. |
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Definition
| False, momentum is conserved in both elastic and inelastic collisions. |
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