Exam 3 Quiz 2

10 Questions | By Amoverby | Last updated: Oct 31, 2014 | Total Attempts: 192

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1.

An action exerted on an object which may change the object’s state of rest or motion defines
- A.
  
  Acceleration
- B.
  
  Force
- C.
  
  Mass
- D.
  
  Velocity
2.

Which of the following statements are true about the concept of field forces?I. Field forces can be exerted by objects that are in physical contact.II. Field forces can be exerted by objects that are not in contact.III. There are four fundamental field forces.
- A.
  
  I only
- B.
  
  II only
- C.
  
  II and III
- D.
  
  I, II, and III
3.

Two pumpkins are sitting next to each other on Ms. Overby’s front porch. The force due to gravity on the first pumpkin is 9 N and on the second is 13 N. The gravitational force on the porch itself is 125 N. The ground supports the porch with an upward force of 147 N. In a free-body diagram of the porch, how many contact forces and how many field forces should be represented?
- A.
  
  1, 2
- B.
  
  1, 3
- C.
  
  2, 2
- D.
  
  3, 1
4.

Which of the following situations describes inertia?
- A.
  
  A stationary object tends to resist being moved.
- B.
  
  A moving object tends to resist a change in speed.
- C.
  
  A moving object tends to resist a change in direction.
- D.
  
  All of the above
5.

Which of the following is true of inertia?
- A.
  
  It is described in Newton’s first law of motion.
- B.
  
  It is a property of motion.
- C.
  
  It is measured by weight.
- D.
  
  All of the above
6.

An object is at rest on an incline. The component of gravity acting downward below the incline on the object is described as Fg= 8.0 N. Which axis is pointing up along the incline?
- A.
  
  + x-axis
- B.
  
  + y-axis
- C.
  
  - x-axis
- D.
  
  - y-axis
7.

Which of the following statements describe an object in equilibrium?I. The object is at rest.II. The object is moving at constant velocity.III. The net external force on the object is zero.
- A.
  
  I and II
- B.
  
  I and III
- C.
  
  II and III
- D.
  
  I, II, and III
8.

A rigid rod holds a Witch’s broom shop sign horizontally from the side of a building. The force due to gravity acting on the sign is 165 N with the angle between the sign and the rod being 50.0. Ignoring the weight of the rod, what is the magnitude of the tension in the rod?
- A.
  
  215 N
- B.
  
  165 N
- C.
  
  126 N
- D.
  
  257 N
9.

A goblin is holding a skull above his head with a mass of 353 kg. The goblin’s mass is 193 kg. Draw a free-body diagram showing the various forces in the problem. Calculate the normal force exerted on each of the goblin’s feet during the time he was holding the skull.
- A.
  
  5356 N
- B.
  
  5460 N
- C.
  
  2678 N
- D.
  
  2730 N
10.

The net force exerted by a bat’s wing when it flies can be as large as 7.90 N, assuming that the bat has a mass of 60.0 g. Assume that two different muscles pull the bat’s wing forward and downward, exerting a net force of 7.90 N. If the forces exerted by the muscles are at right angles to each other and the muscle that pulls the bat’s wing downward exerts a force of 1.30 N, what is the magnitude of the force exerted by the other muscle? Draw a free-body diagram showing the forces acting on the bat’s wing.
- A.
  
  60.7 N
- B.
  
  7.8 N
- C.
  
  8.0 N
- D.
  
  64.1 N