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Phy Sc Ch 12 Review Part 2
Test Description: Ch 12 Review Part 2
Instructions: Answer all questions to get your test result.
1) The acceleration due to gravity on the surface of Mars is about one third the acceleration due to gravity on Earth's surface. The weight of a space probe on the surface of Mars is about
A
nine times greater than its weight on Earth's surface
B
one third its weight on Earth's surface
C
the same as its weight on Earth's surface
D
three times greater than its weight on Earth's surface
2) Newton's third law of motion describes
A
net force
B
centripetal forces
C
action and reaction forces
D
balanced forces
3) In which of the following are action and reaction forces involved?
A
when rowing a boat
B
when a tennis racket strikes a tennis ball
C
all of the above
D
when stepping from a curb
4) The product of an object's mass and velocity is its
A
velocity
B
centripetal force
C
momentum
D
speed
5) What is conserved when two objects collide in a closed system?
A
speed
B
acceleration
C
momentum
D
velocity
6) What is the momentum of a 50-kilogram ice skater gliding across the ice at a speed of 5 m/s?
A
10 kg / (m/s)
B
50 kg
C
500 kg x m/s
D
250 kg x m/s
7) What force is responsible for the repulsion between two positively-charged particles?
A
electric
B
gravitational
C
centripetal
D
nuclear
8) When opposite poles of two magnets are brought together, the poles
A
repel each other
B
cancel each other
C
cause a net force of zero
D
attract each other
9) Which universal force acts only on the protons and neutrons in a nucleus?
A
magnetic
B
gravitational
C
electric
D
strong nuclear
10) With which of the following is the weak nuclear force associated?
A
nuclear decay
B
lightning
C
ocean tides
D
static cling
11) Which of the following universal forces is the weakest?
A
magnetic
B
gravitational
C
electric
D
strong nuclear
12) As an astronaut travels far away from Earth, her weight
A
increases because gravity increases.
B
decreases because gravity decreases.
C
decreases because her mass decreases.
D
remains the same because her mass remains the same.
13) The gravitational force between two objects increases as mass
A
increases or distance increases
B
decreases or distance increases
C
increases or distance decreases
D
decreases or distance decreases
14) The force that keeps an object moving in a circle is called
A
momentum
B
inertia
C
centripetal force
D
fluid friction
15) The centripetal force acting on a satellite in orbit
A
changes the direction of the satellite
B
all of the above
C
is a center-directed force
D
acts as an unbalanced force on the satellite
*select an answer for all questions
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