Practice Quiz- Chapters 1 and 2
Mr. Hark's dog, Precious, is sitting perfectly still on a board supported at each end by concrete blocks. One block pushes up on one end of the Precious.board combo with a force of 200 N. The other block at the other end pushes up with 225 N. Under these conditions, the weight of the Precious/board combo is _______ N. If Precious' weight is 380 N, the board's weight is _______ N
425 and 45
Early Greeks knew (to a fair approximation) A) the size of the moon B) the size of the earth C) the earth-moon distance D) all of these E) none of these
D
A hockey puck is set in motion across a flat horizontal frozen pond by a hockey stick. Assume that ice friction and air resistance are negligible and can be ignored. After losing contact with the hockey stick, the force required to keep the puck sliding at a constant speed in an unchanging direction is A) zero newtons B) equal to the weight of the puck C) the weight of the puck divided by the force on the puck D) the mass of the puck multiplied by a physical constant E) none of these
A
An empty truck is moving at a constant velocity. Inside the closed storage compartment of this moving truck, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor A) exactly below the midpoint of the ceiling B) ahead of the midpoint of the ceiling C) behind the midpoint of the ceiling D) at a location we cannot determine without more information
A
Aristotle asserted that an object stops moving because the state of rest is the proper state for any object. Galileo opposed this idea by inferring that a moving object A) encounters opposing forces (e.g; friction of surfaces across which it moves) B) runs out of force to keep it moving (e.g; force stored inside the object is eventually lost) C) rarely, if ever, gives 100% D) simply gets tired of moving, so it stops
A
Of the sciences known as physics, chemistry, and biology, the most basic is A) physics B) chemistry C) biology D) the one that is least acidic
A
Science is a body of knowledge that dates back to A) humankind's beginnings B) Greece in the 7th century BC C) Italy in the 16th century AD D) the time of Galileo E) the future
A
This (800 N, motionless man) results in a net force on the man of A) 0 N B) 200 N C) 400 N D) 800 N
A
Which of the following is a scientific statement? A) the moon is made of green cheese B) there are things we will never know about C) matter is filled with undetectable particles D) There are parts of the universe that will never be found by human beings
A
1 pound of force is equivalent to how many Newtons of force? A) 2.2 B) 4.45 C) 9.8 D) 39.37
B
An object following a straight line path at a constant speed A) has a net force acting upon it in the direction of motion B) has no net force acting on it C) must be moving in a vacuum or in the absence of air resistance D) has no forces acting on it
B
If an 800 N man hangs motionless from 4 vertical strands of rope, then the tension in each strand of rope is A) 0 N B) 200 N C) 400 N D) 800 N
B
The number of meters in one kilometer (or the number of grams in one kilogram) is A) 100 B) 1000 C) 10,000 D) 1 brazillion
B
When a hypothesis has been tested over and over again and has not been contradicted, it may become known as a(n) A) law or principle B) theory C) fact D) observation E) lot of trouble
B
The force of friction on a sliding object is 10 newtons (assume no air resistance for this question). For this object to maintain a constant speed in an unchanging direction, you would have to apply a constant force that has a magnitude of A) more than 10 N B) less than 10 N C) 10 N
C
When do you have no change in your state of motion? A) when you are at rest B) when you are moving at a constant speed in an unchanging direction C) both situations described in A & B D) neither situation described in A & B
C
_______ is the sluggishness or reluctance of any object to change its state of motion or state of rest
Inertia
If an object is in dynamic equilibrium, its speed in a specific direction is _______(specific vocabulary word). If the same object is in static equilibrium, its speed in a specific direction is _______ (numerical value)
constant and zero
The 3 fundamental quantities of physics are _______, _______, and _______
mass, duration, time
The technical name for the upward force a surface applies to an object is called the _______ force. It means "perpendicular to" and does NOT start with an "s"
normal
The Greek symbol, ∑, means _______ ____ (two words, first word starts with an "s" and the second word starts with "o"
sum of
The name of the force a rope or string exerts on an object attached to it is called _______. This force is a stretching or pulling force.
tension
The bottoms of the bridges are subjected to a force arrangement called _______, while the tops of bridges are subjected to a force arrangement called _______
tension and compression
Your bridge was subjected to three different force situations. One of those was a pulling apart force arrangement called _______. Another was a pushing inward force arrangement called _______
tension and compression
