Physical Science Chapter 1 & 2
The mass of a 100 N sack of seed is closest to
10 kg
A 250 g ball travels at a velocity of 40 m/s. Its momentum is
10 kg m/s
The weight of a 50 kg box is closest to
500 N
A controlled experiment has all variables held constant. True False
False
A theory is a hypothesis that has been shown to be correct by many experiments. True False
False
Imagine an experiment in which a 8 lb bowling ball and a 10 lb bowling ball are dropped from the fifth floor at the same time. The heavier ball will reach the ground first. True False
False
Newton's second law states that if an unbalanced force acts on an object, it will move at constant velocity. True False
False
The force of gravity near the surface of Earth is 9.8 m/s2. True False
False
The mass of 1000 cm3 of water is a kilogram. True False
False
The property of mass is a measure of how heavy an object is. True False
False
The symbol "∆" is used to refer to an object's density. True False
False
When you roll a ball across the floor, it comes to a stop because you are no longer exerting a force on it. True False
False
An object accelerates when it slows or its direction of movement changes. True False
True
Measurement information used to describe something is called data. True False
True
The momentum of an object remains the same unless an unbalanced force acts on it. True False
True
Gravity is an attractive force between
all objects everywhere
Equations are used to
all of the above
A heavy object and a light object are dropped from rest at the same time in a vacuum. The heavier object will reach the ground
at the same time as the lighter object
If you consider the total distance and total time for a trip, you are calculating a(an)
average speed
An experimental situation used as the basis of comparison is the
control group
From the equation w = mg, it is apparent that weight is a(an)
force
The newton is a unit of
force
Everything that happens in the universe can be traced to interactions of
four fundamental forces
Suppose that a rock is swinging in a circle when some string is let out so that the length doubled as the same speed is maintained. The force now exerted on the string is
half as great
The property of volume is a measure of
how much space the object occupies
A tentative scientific explanation which may or may not be rejected upon further experimentation is called a
hypothesis
The tendency of a moving object to remain in unchanging motion in the absence of an unbalanced force is called
inertia
Ignoring air resistance, the velocity of a falling object
is constantly increasing
If an unbalanced force applied to an object doubles, then
its acceleration doubles
A block of iron is transported to the Moon. Which of the following is true?
mass remains the same, but the weight decreases
When something cannot be directly observed, it can be represented by a
model
A cannon ball and a bowling ball were dropped at the same time from the top of a building. At the instant before the balls hit the sidewalk, the cannon ball has greater
momentum
The pound is an English unit of measure; its SI counterpart is the
newton
In the equation A = πr2, π (pi) is a
numerical constant
The English unit of volume closest in size to a liter is
quart
A statement describing a relationship that is observed in nature to occur consistently time after time is a(an)
scientific law
If you double the mass of an object while an unbalanced force remains constant,
the acceleration of the object is halved
A boy on a skateboard pushes off the ground with his foot. He and the skateboard accelerate down the sidewalk due to the force
the ground exerts against his foot
hich of the following is not a SI unit of the property it measures?
volume - liter
