# Phy Sc Ch 12 Review Part 2: Question Preview (ID: 18000)

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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) three times greater than its weight on Earth's surface
c) one third its weight on Earth's surface
d) the same as its weight on Earth's surface

Newton's third law of motion describes
a) action and reaction forces
b) balanced forces
c) centripetal forces
d) net force

In which of the following are action and reaction forces involved?
a) when a tennis racket strikes a tennis ball
b) when stepping from a curb
c) when rowing a boat
d) all of the above

The product of an object's mass and velocity is its
a) centripetal force
b) momentum
c) speed
d) velocity

What is conserved when two objects collide in a closed system?
a) acceleration
b) momentum
c) speed
d) velocity

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) 500 kg x m/s
c) 50 kg
d) 250 kg x m/s

What force is responsible for the repulsion between two positively-charged particles?
a) centripetal
b) electric
c) gravitational
d) nuclear

When opposite poles of two magnets are brought together, the poles
a) attract each other
b) repel each other
c) cancel each other
d) cause a net force of zero

Which universal force acts only on the protons and neutrons in a nucleus?
a) electric
b) gravitational
c) magnetic
d) strong nuclear

With which of the following is the weak nuclear force associated?
a) lightning
b) nuclear decay
c) ocean tides
d) static cling

Which of the following universal forces is the weakest?
a) electric
b) gravitational
c) magnetic
d) strong nuclear

As an astronaut travels far away from Earth, her weight
a) decreases because gravity decreases.
b) decreases because her mass decreases.
c) increases because gravity increases.
d) remains the same because her mass remains the same.

The gravitational force between two objects increases as mass
a) decreases or distance decreases
b) decreases or distance increases
c) increases or distance decreases
d) increases or distance increases

The force that keeps an object moving in a circle is called
a) centripetal force
b) fluid friction
c) inertia
d) momentum

The centripetal force acting on a satellite in orbit
a) acts as an unbalanced force on the satellite
b) changes the direction of the satellite
c) is a center-directed force
d) all of the above

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