BILLY SCIENCE TEST 7 - LESSON 101 QUESTIONS
ANSWERED AND GRADED
What is the actual mechanical advantage of a machine that allows a man to lift a 1000 N box
with an input force of 250 N? - Correct Answer 4
Isaac Newton published the laws of motion and universal gravitation in his book - Correct
Answer Principia
Physical quantities having both magnitude and direction are ___ quantities - Correct Answer
vector
Physical quantities having magnitude but NOT direction are ___ quantities - Correct Answer
scalar
In physics, any change in speed, direction, or both is __________________ - Correct Answer
acceleration
____ is NOT a form of assistance provided by a simple machine - Correct Answer increasing the
work done.
The acceleration of gravity at the surface of the earth is? - Correct Answer 9.81 m/s2
What is the average speed of a car that travels 500 km in 10 hrs? - Correct Answer 50 km/hr
The vector representing the change in an object's position is - Correct Answer displacement
A 1 kg brick and a 100 kg safe were both dropped from the top of a tall building at the same
time. If air resistance is ignored, which of the following statements is true?
, a) the brick hit the ground first
b) the safe hit the ground first
c) both hit the ground at the same time
d) the order in which they hit the ground is random. - Correct Answer C
The velocity at which the force of air resistance on a falling object equals the object's weight is
the ___ velocity. - Correct Answer terminal
A "center-seeking" force that causes an object to travel in a curved path rather than in a straight
line is ____ force. - Correct Answer centripetal
The SI unit of power is the - Correct Answer watt
____ does not affect the force of friction? - Correct Answer area in contact
Under ideal conditions, a machine's work output is _____ its work input. - Correct Answer
equal to
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 (relative to the walkway) - Correct Answer 10 cm/s east
The "quantity of motion" of an object, equal to the product of the object's mass and velocity, is
____ - Correct Answer momentum
For every action there is an equal and opposite reaction - Correct Answer 3rd law of motion.
states the relationship between the hypotenuse and legs of a right triangle - Correct Answer
Pythagorean theorem
ANSWERED AND GRADED
What is the actual mechanical advantage of a machine that allows a man to lift a 1000 N box
with an input force of 250 N? - Correct Answer 4
Isaac Newton published the laws of motion and universal gravitation in his book - Correct
Answer Principia
Physical quantities having both magnitude and direction are ___ quantities - Correct Answer
vector
Physical quantities having magnitude but NOT direction are ___ quantities - Correct Answer
scalar
In physics, any change in speed, direction, or both is __________________ - Correct Answer
acceleration
____ is NOT a form of assistance provided by a simple machine - Correct Answer increasing the
work done.
The acceleration of gravity at the surface of the earth is? - Correct Answer 9.81 m/s2
What is the average speed of a car that travels 500 km in 10 hrs? - Correct Answer 50 km/hr
The vector representing the change in an object's position is - Correct Answer displacement
A 1 kg brick and a 100 kg safe were both dropped from the top of a tall building at the same
time. If air resistance is ignored, which of the following statements is true?
, a) the brick hit the ground first
b) the safe hit the ground first
c) both hit the ground at the same time
d) the order in which they hit the ground is random. - Correct Answer C
The velocity at which the force of air resistance on a falling object equals the object's weight is
the ___ velocity. - Correct Answer terminal
A "center-seeking" force that causes an object to travel in a curved path rather than in a straight
line is ____ force. - Correct Answer centripetal
The SI unit of power is the - Correct Answer watt
____ does not affect the force of friction? - Correct Answer area in contact
Under ideal conditions, a machine's work output is _____ its work input. - Correct Answer
equal to
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 (relative to the walkway) - Correct Answer 10 cm/s east
The "quantity of motion" of an object, equal to the product of the object's mass and velocity, is
____ - Correct Answer momentum
For every action there is an equal and opposite reaction - Correct Answer 3rd law of motion.
states the relationship between the hypotenuse and legs of a right triangle - Correct Answer
Pythagorean theorem
