Download PHYSICS CHAPTER 6 SECTION 3 Worksheet 1

PHYSICS CHAPTER 6 SECTION 3 Worksheet 1
Name
1.
2.
Block
A 500 kilograms is at rest and is free to move. At a certain time, 25.0 seconds after a force acts on it, the mass has a velocity
in the direction of the force of 150 m/s. Determine the magnitude of the force. (Answer 3000N)
A bullet, mass of 60 grams, is fired from a gun that is suspended by wires and is free to move. The mass of the gun is 5.00
kg. The speed of the bullet is 615 m/s. Determine the speed of the recoil of the gun.
(Answer -7.38 m/s)
BEFORE
Velocity Initial = 0 m/s
3.
AFTER
mass gun = 5 kg
Vel Final =? m/s
mass bullet = 60 g
Vel Final =615 m/s
A 1.5 kilogram ball whose velocity is 8.0 m/s southward collides with a 2.0 kilogram ball traveling along the same path with
a velocity of 3.00 m/s southward. If the velocity of the 2.00-kilogram ball is 4.5 m/s southward after impact, what is the
velocity of the 1.5 kilogram ball? (Answer 6 m/s southward)
Before
1.5 kg
8 m/s
2 kg
3 m/s
After
1.5 kg
? m/s
2 kg
4.5 m/s
-27
6
4.
A proton (mass = 1.67 X 10 kg) moves with a velocity of 6.00 X 10 m/s. Upon colliding with a stationary particle of
6
unknown mass, the proton rebounds on its own path with a velocity of 4.0 X 10 m/s. The collision sends the unknown
6
-27
particle forward with a velocity of 2.5 X 10 m/s. What is the mass of the unknown particle?
(Answer 6.68 X 10 kg)
5.
A freight car with a mass of 3.0 X 10 kilogram travels at a velocity of 2.5 m/s. It collides with a stationary car having a
5
mass of 1.5 X 10 kilograms on a horizontal track. The cars connect and roll together after impact. Determine the velocity
of the connected cars.
(Answer V = 1.67 m/s)
6.
Benjamin Franklin once said that light could not consist of particles because if a particle would travel as such tremendous
8
speeds 3 X 10 m/s, it would have the impact of a 10- kilogram cannon ball fired from a cannon with a velocity of 100 m/s.
According to this comparison, what is the mass of Franklin’s particle of light?
-6
(Answer m = 3.3 X 10 kg)
7.
A person is skiing down a hill. The person’s mass, including skis, is 65 kilograms. When the person reaches the bottom of
the hill the speed is 15 m/s. The person hits a snowdrift and stops in .3 seconds with uniform deceleration. A) How far does
the person penetrate the snowdrift? B) With what average force does the person hit the snowdrift? (Answer 2.25 m, 3.25 X
3
10 N)
5
PHYSICS CHAPTER 6 SECTION 3 Worksheet 1
8.
Two balls collide head-on with equal velocity. One ball has three times the mass of the other. After the elastic collision,
the more massive ball stops and the less massive one moves back along its original path with twice its original velocity.
Show that momentum is conserved in the collision.
(Answer -2m2Vi2 = -2m2Vi2)
9.
In a crash test, an automobile of mass 1625-kg collides with a wall. The initial velocity of the automobile was negative 18
m/s and the velocity after the crash was +1.46 m/s (movement in the opposite direction). If the collision lasts for 0.02
seconds find the impulse using the fact that I = ΔP. Also find the average force exerted on the automobile.
4
5
(Answer 2.64 X 10 kg m/s, 1.76 X 10 N)
10.
In a ballistic test, a 10-gram bullet is stopped in a block of wood of mass 7 kg. The speed of the bullet-wood combination
immediately after the collision is .75 m/s. Find the initial speed of the bullet. If the bullet stops in .05 seconds with uniform
deceleration determine the penetration of the bullet and the force the bullet imparts on the block of wood.
(Answer 525.75 m/s, 13.14m, 105.15N)