Download Lesson 1.05 Self-Check Quiz.

Lesson 1.05 Newton’s Third Law
Self-Check Quiz
1. An object of 2 kg mass, acted upon by a net force of 20 N, will
experience what acceleration?
a. 5 m/s2
b. 10 m/s2
c. 7.5 m/s2
d. 12.4 m/s2
Answer: _____
2. A box rests on a level table. Let W be the weight of the box, and N
is the normal of the table on the box. In magnitude, W is opposite and
___ N, and the two forces ___ action-reaction pair.
a. equals, are
b. equals, are not
c. is greater than, are
d. is greater than, are not
Answer: _____
3. A 2.0-kg object is acted on by a force F. The object is moving with
acceleration of 10 m/s2. Find F.
a. 0.2 N
b. 5 N
c. 12 N
d. 20 N
e. none of them
Answer: _____
4. You jump off a truck and accelerate toward the surface of the Earth.
Does the Earth accelerate toward you?
a. Yes, but the acceleration of the Earth is very small
b. No, the acceleration of the Earth is zero
c. Yes, Newton's 3rd Law implies the accelerations are equal
d. cannot be determined
e. none of the above
Answer: _____
5. All objects tend to maintain their state of motion because they
have:
a. mass
b. weight
c. speed
d. acceleration
e. all of these
Answer: _____
6. If a 60-ton Patton tank collides with a little Honda Civic, which
vehicle will experience the greater impact force?
a. The tank
b. The Civic
c. Both the same
d. Neither feels a force
Answer: _____
7. If a net force is acting on an object, then _______________.
a. The object is at rest
b. The object is moving with constant velocity
c. The object is being accelerated
d. The object is losing mass
Answer: _____
8. In Newtonian mechanics, ____ is the cause and _____ the effect.
a. acceleration, velocity
b. force, acceleration
c. acceleration, force
d. force, velocity
e. none of the above
Answer: _____
9. A 1000-kg sports car of mass accelerates from rest to 20 m/s in 6.6
s. What is the force exerted by the road on the car?
a. 1500 N
b. 1750 N
c. 2750 N
d. 3000 N
Answer: _____
10. Two forces act on an object. A 10 N force is directed North and a 5
N force South. The object moves at constant acceleration of 2 m/s2. What
is the mass of the object?
a. 7.5 kg
b. 2.5 kg
c. 7.5 kg
d. 5 kg
e. none of the above
Answer: _____
11. Bill weighs 160 lb. He is standing on a scale inside an elevator.
What is the reading on the scale if the elevator is accelerating
downward?
a. 160 lb
b. less than 160 lb
c. greater than 160 lb
d. zero
Answer: _____
12. Two forces, 300 N and 500 N, act on an 80-kg particle. 300 N north
and 500 N east. Find the magnitude of the resultant acceleration if the
forces make a 900 angle with each other.
a. 5.45 m/s2
b. 6.24 m/s2
c. 6.85 m/s2
d. 7.29 m/s2
e. 8.09 m/s2
Answer: _____
13. Mike stands on a scale in an elevator. If the elevator is
accelerating upwards with 4.9 m/s2, the scale reading is ____ times
Mike's weight.
a. 1.15
b. 1.5
c. 1.55
d. 1.60
e. none of them
Answer: _____
14. A truck moving at 13.3 m/s hits a concrete wall. As a result of the
collision, a 6-kg wrench moves forwards and strikes the wall of the
tool compartment. If the wrench stops after being in contact with the
wall for 0.07 s, what is the average force exerted on the wrench by the
wall?
a. 78 N
b. 1140 N
c. 1300 N
d. 4800 N
e. 1.14 x 106 N
Answer: _____