Exam Questions and CORRECT Answers
A music Console is pushed a distance of 2 m with a force of 20N. The work done on the console
is
1) 2 J
2) 10 J
3) 80 J
4) 20 J
5) 40 J - CORRECT ANSWER - 5) 40 J
A 4 kg ball has a momentum of 12kg*m/s. What is the ball's speed?
12 m/s
3 m/s
48 m/s
4 m/s
none of the above - CORRECT ANSWER - 3 m/s
Which has greater kinetic energy, Car 1 traveling at 30 km/h or Car 2 of half the mass traveling
at 60 m/h?
Car 1
Car 2
Both have the same kinetic energy - CORRECT ANSWER - Car 2
An object with kinetic energy must be
,at rest
moving
at an elevated position
falling
none of the above - CORRECT ANSWER - moving
An object lifted 10 m gains a certain amount of potential energy. If it is lifted 20 m, its gain in
potential energy is
four times as much
twice as much
the same
less
more than four times as much - CORRECT ANSWER - twice as much
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but
has twice as much mass, it momentum is
unchanged
zero
quadrupled
doubled - CORRECT ANSWER - doubled
When a non-hybrid car brakes to a stop, its kinetic energy transforms into
energy of rest
stopping energy
energy of motion
potential energy
, heat - CORRECT ANSWER - heat
A ball is moving at 4 m/s and has a momentum of 48 kg*m/s. What is the ball's mass?
12 kg
48 kg
192 kg
4 kg
none of the above - CORRECT ANSWER - 12 kg
When you push an object a certain distance while applying twice the force, you do
the same amount of work
four times as much work
twice as much work - CORRECT ANSWER - twice as much work
If a charging rhinoceros has momentum, it must also have
work
potential energy
kinetic energy
all of the above - CORRECT ANSWER - kinetic energy
A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that
is initially at rest. After the putty sticks to the ball, both move with a continued momentum of
1 unit
less than 1 unit