Physics%20Quiz

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Physics Quiz

• Kinematics
• 6-2-2004

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• Find the momentum of
• A 3-kg melon falling from a building at 5 m/s.

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• Find the momentum of
• A 3-kg melon falling from a building at 5 m/s.

Since momentum is mass times velocity,
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Find the momentum of A 700-kg car parked in
the garage 30 meters above the street.
If the car is parked, then the velocity is zero.
Since momentum is mass times velocity, the
momentum is also zero.
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How much work was done on the car to get it to
the parking spot? A 700-kg car parked in the
garage 30 meters above the street.
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OK!
That was fun, now lets get to work. The next
bunch of questions is on your own. The questions
are timed, so youll need to pay attention and
stay on task. Write the letter of the answer.
There may be more than one correct answer for
some questions.
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• A ____________ is a quantity divided by time.
• vector
• rate
• speed
• quotient

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• 2. The units that are not used for speed are
• m/s
• m/s2
• miles per hour
• cm/min

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3. A cat chases a mouse for 30 meters. It takes 6
seconds to catch the mouse. The cats speed
isa. 180 miles per hourb. 180 m/sc. 0.2
m/sd. 5 m/se. 36 m/s
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• 4. Velocity is
• the same as speed
• the same as acceleration
• acceleration and direction
• speed and direction
• distance times time

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• 5. Quantities with a direction associated with
  them are called
• velocities
• speeds
• vectors
• weights
• compass points

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• 6. Velocity is changing if either_______
  ________________ is changing.
• speed or acceleration
• acceleration or direction
• acceleration or momentum
• direction or momentum
• direction or speed

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• 7. Acceleration is the rate of change of
• direction
• speed
• time
• velocity
• both a and c
• both b and c

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• 8. A marble rolling 5 m/s takes ______
• to roll 35 meters.
• 7 seconds
• 40 m/s
• 40 seconds
• 175 seconds
• 7 meters

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• 9. Which is moving faster, a red car that goes 3
  miles in 15 minutes, or a silver car that goes 27
  miles in 80 minutes?
• The red car
• The silver car
• Both are the same speed

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• 10. What is the velocity of a truck which
  accelerates at 9 m/s2 for 7 seconds?
• 16 m/s
• 16 m/s2
• 63 m/s
• 63 m/s2
• 0.777 m/s

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• 11. An object in free fall is accelerating,
  except at the top of the flight path.
• True
• False

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• 12. _____________ is the force on an object due
  to gravity.
• Push
• Pull
• Weight
• Momentum
• Potential energy

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• 13. A hammer falls from the top of a building at
  a construction site, 54 meters up. How fast is it
  moving after 1.5 seconds?
• 14.7 m/s
• 81 m/s
• 36 m/s
• 529.2 m/s

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• 14. Johnny pushes a refrigerator from the left
  with a force of 9 N, while Susie pushes from the
  right with 19 N. The net force on the
  refrigerator is
• zero, because they cant move it.
• 28 N, because they are both pushing
• 10 N, because they push in different directions

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• 15. Which of the following indicate velocity?
• 10 miles per hour
• 5 m/s upward
• 9.8 m/s2 downward
• 6 miles per hour east
• 8 m/s towards me.

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• 16. Which vector best represents the resultant of
  these two vectors?
• b.
• c. d.

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• 17. An airplane flies at 55 m/s into the wind,
  which is blowing 10 m/s. What speed does the
  airplane have relative to an observer on the
  ground?
• 65 m/s
• 5.5 m/s
• 550 m/s
• 45 m/s

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• 18. A cannonball has horizontal and vertical
  velocities as shown. Which set of vectors best
  represents its velocity at the top of its flight?
• b.
• c. d.

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• 19. A projectile that is moving so fast that it
  falls around the earth instead of into the earth
  is called a
• space shuttle
• moon
• really fast cannonball
• satellite

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• 20. A projectile with a horizontal component of
  velocity of 3 m/s and a vertical component of 4
  m/s has an actual velocity of
• 12 m/s
• 7 m/s
• 5 m/s
• 1 m/s

4 m/s
?
3 m/s
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Check your answers. Count how many
correct. 1 b 2 b 3 d 4 d 5 c 6 e
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7 d 8 a 9 b 10 c 11 b 12 c 13 a
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14 c 15 b, d, and e 16 a 17 d 18 a 19 d 20
c