- #1
rickkwa
- 3
- 0
I'm studying for a test tomorrow, I found these multiple choice questions but no answers to them. If you can help me out so I know which one is correct so I can study properly, that would be much appreciated :D
1. A 24-kg traffic light is suspended from the midpoint of a cable suspended between 2 poles. The angle between the cable and the pole is 80 degrees at both poles. The net force acting on the traffic light has a value of:
a. zero // this one maybe?
b. 47 N
c. 82 N
d. 2.4 x 10^2 N
e. 4.6 x 10^2 N
2. Is this an example of inertia?
A person is largely unaware of a car's motion when his eyes are closed.
// I want to say no..
3. With respect to Newton's third law, the action and reaction forces:
a. being equal, imply a "balanced" force situation
b. act on different objects
c. are equal provided the object is at rest
d. are equal provided the object is moving with uniform motion
e. are equal provided the object is NOT at rest or moving with uniform motion
4. A 4-kg object, A, and a 2-kg object, B, are connected with a rope. A force is applied to another rope attached to the 2-kg object that pulls both A and B along a horizontal surface. Which of the following statements is true?
a. The force that B exerts on A is greater than the force that A exerts on B
b. The force that A exerts on B is greater than the force that A exerts on B
c. The force that B exerts on A is equal to the force that A exerts on B provided that the system slides with uniform motion
d. The force that B exerts on A is equal to the force that A exerts on B regardless of the motion of the system
e. The sum of the applied force and the force that B exerts on A is equal to the force that A exerts on B
5. An object is pushed horizontally at a constant velocity. What can correctly be said about the forces acting on the object?
a. The force(s) acting forward is/are greater than the force(s) acting backward
b. The sum of all the forces has a value directed forward
c. The sum of all forces is zero
d. The forces acting on the object can be said to be "unbalanced"
e. Newton's second law best summarizes the effect of the forces acting on the object
6. An elevator is moving upward at a constant velocity. What is the relationship between the gravitational force (Fg) acting on the elevator and the tension (Ft) in the cable that supports the elevator?
a. Fg = Ft
b. Fg > Ft
c. Fg < Ft
d. Fg >= Ft
e. Fg <= Ft
7. Three identical masses are suspended vertically. There are strings between the masses to hold them together. There is also a string to hold the topmost mass. The system is accelerating upward. What is the relationship among the forces of tension? Ft1, Ft2, Ft3 are the tensions. Ft1 being on top.
a. Ft1 = Ft2 = Ft3
b. Ft1 > Ft2 > Ft3 // I am thinking its probably this one
c. Ft1 < Ft2 < Ft3
d. Ft1 > Ft2 < Ft3
e. Ft1 > Ft3 < Ft2
8. An object sits at rest on a ramp. As the angle of inclination of the ramp increases, the object suddenly begins to slide. Which of the following explanations best accounts for the object's movement?
a. The coefficient of static friction has decreased sufficiently
b. The force of gravity acting on the object has increased sufficiently
c. The component of gravity along the ramp has increased sufficiently // This is my best bet
d. The friction has decreased sufficiently while the normal force has remained unchanged
e. The formal force has increased sufficiently
1. A 24-kg traffic light is suspended from the midpoint of a cable suspended between 2 poles. The angle between the cable and the pole is 80 degrees at both poles. The net force acting on the traffic light has a value of:
a. zero // this one maybe?
b. 47 N
c. 82 N
d. 2.4 x 10^2 N
e. 4.6 x 10^2 N
2. Is this an example of inertia?
A person is largely unaware of a car's motion when his eyes are closed.
// I want to say no..
3. With respect to Newton's third law, the action and reaction forces:
a. being equal, imply a "balanced" force situation
b. act on different objects
c. are equal provided the object is at rest
d. are equal provided the object is moving with uniform motion
e. are equal provided the object is NOT at rest or moving with uniform motion
4. A 4-kg object, A, and a 2-kg object, B, are connected with a rope. A force is applied to another rope attached to the 2-kg object that pulls both A and B along a horizontal surface. Which of the following statements is true?
a. The force that B exerts on A is greater than the force that A exerts on B
b. The force that A exerts on B is greater than the force that A exerts on B
c. The force that B exerts on A is equal to the force that A exerts on B provided that the system slides with uniform motion
d. The force that B exerts on A is equal to the force that A exerts on B regardless of the motion of the system
e. The sum of the applied force and the force that B exerts on A is equal to the force that A exerts on B
5. An object is pushed horizontally at a constant velocity. What can correctly be said about the forces acting on the object?
a. The force(s) acting forward is/are greater than the force(s) acting backward
b. The sum of all the forces has a value directed forward
c. The sum of all forces is zero
d. The forces acting on the object can be said to be "unbalanced"
e. Newton's second law best summarizes the effect of the forces acting on the object
6. An elevator is moving upward at a constant velocity. What is the relationship between the gravitational force (Fg) acting on the elevator and the tension (Ft) in the cable that supports the elevator?
a. Fg = Ft
b. Fg > Ft
c. Fg < Ft
d. Fg >= Ft
e. Fg <= Ft
7. Three identical masses are suspended vertically. There are strings between the masses to hold them together. There is also a string to hold the topmost mass. The system is accelerating upward. What is the relationship among the forces of tension? Ft1, Ft2, Ft3 are the tensions. Ft1 being on top.
a. Ft1 = Ft2 = Ft3
b. Ft1 > Ft2 > Ft3 // I am thinking its probably this one
c. Ft1 < Ft2 < Ft3
d. Ft1 > Ft2 < Ft3
e. Ft1 > Ft3 < Ft2
8. An object sits at rest on a ramp. As the angle of inclination of the ramp increases, the object suddenly begins to slide. Which of the following explanations best accounts for the object's movement?
a. The coefficient of static friction has decreased sufficiently
b. The force of gravity acting on the object has increased sufficiently
c. The component of gravity along the ramp has increased sufficiently // This is my best bet
d. The friction has decreased sufficiently while the normal force has remained unchanged
e. The formal force has increased sufficiently