Lesson 2 Impulse Questions
(name)
1. An average net force of 17.0 N east acts on an object for 2.5 x 10 s. What is the impulse?
2
2. An average net force of 11.2 N west acts on an object, producing an impulse of 7.00 N•s west.
How long does the force act on the object?
3. An average net force of 25.0 N north acts on an object for 7.20 x 10-1 s. What is the change in
the object’s momentum?
4. A 5.00 kg object uniformly accelerates from rest to a velocity of 15.0 m/s east. What is the
impulse on the object?
5. An average net force causes an 11.0 kg object to accelerate uniformly from rest. If this object
travels 26.3 m west in 3.20 s, what is the change in the object’s momentum?
6. A 1.0 kg ball hits the floor with a velocity of 2.0 m/s. If this ball bounces upward off the floor
with a velocity of 1.6 m/s, what is the ball’s change in momentum?
7. A 9.5 x 103 kg rocket is launched upward from rest by an average net force of 1.5 x 105 N up.
After 15 s, the rocket runs out of fuel. What is the velocity of the rocket once it runs out of fuel?
8. Padding inside a hockey helmet not only makes it more comfortable to wear, but acts as a
safety feature by _________, __________, and __________. (Fill in the blanks by selecting the
correct statements.)
i. increasing the stopping time of the helmet during impact
ii. decreasing the stopping time of the helmet during impact
iii. increasing the stopping distance of the helmet during impact
iv. decreasing the stopping distance of the helmet during impact
v. increasing the area of the skull over which the force is exerted
vi. decreasing the area of the skull over which the force is exerted
a.
b.
c.
d.
i, iii, vi
i, iii, v
ii, iii, vi
i, iv, v
10. Which of the following correctly identifies momentum and impulse as scalar or vector
quantities?
MOMENTUM
IMPULSE
A.
scalar
scalar
B.
scalar
vector
C.
vector
scalar
D.
vector
vector
Numeric Response
1. Momentum is a ________ quantity that is the ________ of the mass of a/an ______ and its
________. Fill in the blanks by selecting the correct words in the proper order from the list
below.
1. scalar
2. product
3. speed
4. object
9. direction
5. sum
6. vector
7. velocity
8. quotient
(Record all four digits of your answer on the answer sheet.)
11. Which of the following statements are true about impulse?
A. Impulse is a force.
B. Impulse is a vector quantity.
C. An object which is traveling east would experience a westward directed impulse in a collision.
D. Objects involved in collisions encounter impulses.
E. The Newton is the unit for impulse.
F. The kg•m/s is equivalent to the units on impulse.
G. An object which experiences a net impulse will definitely experience a momentum change.
H. In a collision, the net impulse experienced by an object is equal to its momentum change.
I. A force of 100 N acting for 0.1 seconds would provide an equivalent impulse as a force of 5 N
acting for 2.0 seconds.