physical quantities having magnitude but not direction
scalar
100
the acceleration of gravity at the surface of the earth is
9.81 m/s2
100
the actual mechanical advantage of a machine allowing a man to lift a 1000 N box with an output force of 250 N
4
100
Isaac Newton published the laws of motion and universal gravitation in this book
Principia
100
The resistance arising to an object's motion through a fluid or across a surface
friction
200
physical quantities having both magnitude AND direction
vector
200
the SI unit of power
watt
200
what is the average speed of a car that travels 500 km in 10 hr?
50 km/hr
200
For every action there is an equal and opposite reaction
Newton's third law of motion
200
The SI unit of force
newton
300
the vector representing the change in an object's position
displacement
300
the "center-seeking" force that causes objects to travel in a curved path rather than in a straight line
centripetal force
300
If a moving walkway is going west at 50 cm/s, what is the total velocity of a man on the walkway who walks east at 60 cm/s?
10 cm/s east
300
Any two objects attract each other with a force that depends on their masses and the distance between them
Law of universal gravitation
300
Under ideal conditions, a machine's work output is __________ its work output
A) less than B) equal to C) greater than D) unrelated to
equal to
400
The "quantity of motion" of an object, equal to the product of the object's mass and velocity
momentum
400
the gravitational force exerted on an object near the surface of the earth or any celestial body
gravity
400
Using the formula for work (W=Fd) calculate the following:
How much work does an elevator do in lifting a 600 N person 40. m?
W = 24,000 J or 24 kJ
400
The velocity of an object does not change unless the object is acted upon by an external force
Newton's first law of motion
400
Combination of fixed and movable pulleys
block and tackle
500
the distance traveled in a given time
speed
500
the velocity at which the force of air resistance on a falling object equals the object's weight
terminal velocity
500
Using the formula for average acceleration (a = Vf-Vi/t) calculate the following:
What is the average acceleration of a car that accelerates from 10. m/s forward to 20. m/s forward in 5.0 s?
2.0 m/s2 forward
500
States the relationship between the hypotenuse and the legs of a right triangle
Pythagorean theorem
500
Sloping surface that allows an object to be raised without lifting it straight up