Physical Science
Question 3
If weight is a measure of the force of gravity on an object, then can your weight change without changing your mass?
No, gravity is constant on Earth.
No, gravity is the same throughout the universe.
Yes, gravity is different on different objects in space.
3 points
Question 4
Which of the following is NOT considered a fluid?
gasoline
carbon dioxide
glass
3 points
Question 5
The universal force that is effective over long distances between very massive objects like planets is
inertia
gravity
universal acceleration
3 points
Question 6
The pressure of water in a river is greater at points where the river narrows than where the river is wider.
True
False
2 points
Question 7
According to Pascal’s principle, the pressure of a fluid at any depth is equal in all directions.
True
False
2 points
Question 8
Honey is not a fluid since it is so thick that it has a hard time flowing.
True
False
2 points
Question 9
A large truck has a mass of 2000 kg but is not moving. Its momentum is _____________ kg-m/s.
zero
2000
cannot be determined
3 points
Question 10
The momentum of an object is mass times speed; therefore the momentum of a 10 kg object moving at 15 m/s is 1.5 kg-m/s.
True
False
2 points
Question 11
Instantaneous speed is measured
at the beginning of a trip
over the duration of a trip
at any point in time during the trip
3 points
Question 12
Use the graph to answer the question.
Imported Asset
What is the average velocity of the object represented by the graph above?
5 km/s
6 km/s
30 km/s
3 points
Question 13
Which of the following occurs when the upward force from beneath is greater than the downward force above due to Bernoulli’s principle?
acceleration
lift
momentum
3 points
Question 14
Which principle states that an immersed object is buoyed up by a force equal to the weight of the fluid it displaces?
Archimedes’ principle
Bernoulli’s principle
Pascal’s principle
3 points
Question 15
Which of the following is an example of a force?
electrons moving toward a positive charge
a child kicking a soccer ball
air pushing against a falling object
all of the above
3 points
Question 16
A person is running; the force vector representing the gravitational force on the runner would be in the direction the runner is moving.
True
False
2 points
Question 17
The units for force are kg-m/s.
True
False
2 points
Question 18
Which of the following is an example of a balanced force?
pushing on a wall
kicking a soccer ball
both are examples of balanced forces
3 points
Question 19
Free falling objects accelerate at about 10 m/s, because the forces of friction and air resistance act on them.
True
False
2 points
Question 20
What is the average speed of a car traveling for 1000 miles in 6 hours?
16 mph
166 mph
6000 miles
3 points
Question 21
As the mass of an object increases, so does its gravitational force.
True
False
2 points
Question 22
As an asteroid approaches Earth the gravitational attraction between Earth and the asteroid decreases.
True
False
2 points
Question 23
When an astronaut is in space, her body is acted upon by an increased gravitational force from the Earth.
True
False
2 points
Question 24
A glass of orange juice sitting on a table has motion relative to
the table
the Earth
the Sun
3 points
Question 25
Which of the following best describes a normal force?
a person biking on a sidewalk
a book in contact with a table
a swimmer swimming through the water
all of the above
3 points
Question 26
When a pair of balanced forces acts on an object, the net force that result is
equal to zero
greater in size than one of the forces
equal in size to one of the forces
3 points
Question 27
Based on Newton’s first law of motion, which of the following is true?
Objects at rest stay at rest until acted upon by a force.
No forces are necessary to accelerate an object.
No forces are necessary to accelerate an object.
3 points
Question 28
A gas in a pneumatic system has pressure applied to it to drive the mechanism of a machine.
True
False
2 points
Question 29
A net force of 30 N leftward is applied on a box; this net force resulted from a 50 N force toward the right and a 20 N force toward the left.
True
False
2 points
Question 30
Viscosity is the tendency of a fluid to resist flow. Both gases and liquids can display viscosity.
True
False
2 points
Question 31
The slope of the line on a distance-time graph is the acceleration of an object.
True
False
2 points
Question 32
If the slope of a velocity-time graph is 6, then the speed of the object is 6 m/s at that point.
True
False
2 points
Question 33
All unbalanced forces create
acceleration
inertia
contact forces
speed
3 points
Question 34
The motion of an object may look different to observers in different frames of reference.
True
False
2 points
Question 35
The tendency for an object to sink or float has to do with the object’s density.
True
False
2 points
Question 36
Which of Newton’s laws explains the concept of gravity?
Newton’s 1st Law of Motion
Newton’s 2nd Law of Motion
The Universal Law of Gravitation
3 points
Question 37
Applied force is the force of support exerted by an object that holds up another object.
True
False
2 points
Question 38
The electrical, magnetic, and gravitational forces are the only examples of non-contact forces.
True
False
2 points
Question 39
An object that is accelerating may be slowing down, speeding up, or changing direction.
True
False
2 points
Question 40
Newton’s second law of motion states that an object with a heavier mass will have more acceleration than an object with a smaller mass if both objects are moving at the same speed.
True
False
2 points
Question 41
Suppose a box is sliding up a ramp; how many force vectors would the box have?
0
1
2
3
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