Transcript Physics Review Game: Midterm Ediçion

Physics Review Game:
Chapter 3
Mr. Vannucci’s Class
1. Which person has the greatest inertia?
a) A 110-kg wrestler resting on a mat.
b) A 90-kg man walking at 2 m/s.
c) A 70-kg man running at 5 m/s.
d) A 50-kg girl sprinting at 8 m/s.
2. Which person has the greatest kinetic
energy?
a) A 110-kg wrestler resting on a mat.
b) A 90-kg man walking at 2 m/s.
c) A 70-kg man running at 5 m/s.
d) A 50-kg girl sprinting at 8 m/s.
3. Which person has the greatest
momentum?
a) A 110-kg wrestler resting on a mat.
b) A 90-kg man walking at 2 m/s.
c) A 70-kg man running at 5 m/s.
d) A 50-kg girl sprinting at 8 m/s.
4. In a demonstration, a student throws a raw
egg at a bed sheet held by two other
students, and the egg does not break. The
best reason to explain why the egg does not
break is that
a) The sheet is made of soft cotton.
b) The student threw the egg at an angle so it
struck the sheet at a glancing blow.
c) The sheet stops the egg over a large
distance, leading to a small force.
d) The egg landed on its end, which is harder
to break.
5. A 1.0-kg cart traveling at a constant 2.0 m/s
across a level lab table 0.80 m above the floor
is stopped in a distance of 0.20 m. The
amount of work required to stop the cart is
a) 1 J.
b) 2 J.
c) 2.5 J.
d) 4 J.
6. If the car from problem 5 were to stop in
half the distance, the work required to do so
would be
a) the same
b) twice as much
c) half as much
d) four times as much
7. A constant net force of 20 N acts on an
object of mass 5 kg. As the mass of the object
is increased, the acceleration of the object
will
a) decrease.
b) increase.
c) remain the same.
d) increase until the mass equals the force.
8. In Section 4 we did rear-end collisions
where a clay dummy would tumble out of the
car upon collision. The physical principle that
best explains this is:
a) Newton’s first law.
b) Newton’s second law.
c) the law of action-reaction.
d) whiplash.
9. Describe why a wire seat belt would not be
effective even though the force exerted on
you would be identical to that of a cloth seat
belt
10. What velocity would a 1250 kg car need
in order to have the same momentum as a
3400 kg truck at 7.5 m/s?
11. A BLUE car of an unknown mass starts at
rest. It is hit by a RED cart with a mass of 250
g and a velocity of 3 m/s. The RED cart comes
to rest, and the BLUE cart recoils at 1.25 m/s.
What is the mass of the BLUE cart?
12. Two train cars of identical mass 1200 kg
are moving towards each other. Car 1 has a
velocity of +2 m/s and Car 2 a velocity of -3
m/s.
After colliding, they stick together. What is
their stuck together velocity?
13. A small Saturn with a mass of 900 kg and
starts at a velocity of +12 m/s. It collides with
a 1800 kg Cadillac that starts at rest.
After the collision, the Saturn recoils at a
speed of -0.5 m/s. What is the speed of the
Cadillac after the collision?