# Exam 3 Quiz #1

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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

B. Force
Explanation
Force is defined as an action exerted on an object that has the potential to change the object's state of rest or motion. It is a push or pull that can cause an object to accelerate or decelerate. Force is a vector quantity, meaning it has both magnitude and direction. It is measured in units of Newtons (N) and is a fundamental concept in physics.

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• 2.

### 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

D. All of the above
Explanation
The correct answer is "all of the above". Inertia is the tendency of an object to resist changes in its state of motion. This includes resisting being moved when stationary, resisting a change in speed when already in motion, and resisting a change in direction when already moving. Therefore, all of the given situations accurately describe inertia.

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• 3.

### Two forces act on an object. The magnitude of the net force acting on the object

• A.

Equals the sum of the magnitudes of the two forces.

• B.

Equals the difference in the magnitudes of the two forces.

• C.

Equals the average of the two forces.

• D.

Cannot be determined from the given information.

A. Equals the sum of the magnitudes of the two forces.
Explanation
When two forces act on an object, the net force is the vector sum of the two forces. The magnitude of a vector sum is found by adding the magnitudes of the individual vectors. Therefore, the magnitude of the net force acting on the object equals the sum of the magnitudes of the two forces.

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• 4.

### The normal force

• A.

Equals Fg in magnitude.

• B.

Points vertically upward.

• C.

Is a scalar quantity.

• D.

Acts perpendicular to a surface.

D. Acts perpendicular to a surface.
Explanation
The normal force is the force exerted by a surface to support the weight of an object resting on it. It acts perpendicular to the surface, meaning it is directed at a 90-degree angle away from the surface. This is because the normal force is responsible for counteracting the force of gravity pulling the object downward. Therefore, the correct answer is that the normal force acts perpendicular to a surface.

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• 5.

### Two dogs are tugging on a toy. One dog pulls with a horizontal force of 14 N due north. The other is pulling due east with a horizontal force of 14 N. What is the direction of the net external horizontal force on the toy?

• A.

North

• B.

Northeast

• C.

West

• D.

Northwest

B. Northeast
Explanation
The net external horizontal force on the toy is in the northeast direction because the two dogs are pulling in perpendicular directions. The force due north and the force due east combine to create a resultant force that is in the direction between north and east, which is northeast.

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• 6.

### A single force acting on an object is represented in a free-body diagram of the object by the following force vector:up . Which of the following force vectors represents a single force acting on the object that will bring the object into equilibrium?

• A.

Up

• B.

Right

• C.

Down

• D.

Left

C. Down
Explanation
The force vector "down" represents a single force acting on the object that will bring it into equilibrium. In order for an object to be in equilibrium, the net force acting on it must be zero. Since the initial force vector is "up," which is opposite to the force of gravity, the force vector "down" will cancel out the upward force and bring the object into equilibrium.

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• 7.

### In which situation is the net force acting on a car zero?

• A.

The car increases speed and changes direction.

• B.

The car increases speed but does not change direction.

• C.

The car maintains its speed but changes direction.

• D.

The car maintains both its speed and direction.

D. The car maintains both its speed and direction.
Explanation
When the net force acting on a car is zero, it means that the forces pushing or pulling the car in different directions are balanced. In this situation, the car will continue to move at a constant speed in the same direction without any changes. There is no acceleration or change in velocity, indicating that both the speed and direction of the car are maintained.

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• 8.

• A.

Option 1

• B.

Option 2

• C.

Option 3

• D.

Option 4

B. Option 2
• 9.

### A draft horse exerts a horizontal force of 600 N dragging a log, on which the force of friction is 500 N. The force due to gravity on the log is 700 N and the ground exerts an upward force of 700 N on it.b.Determine the sum of the forces in the x-direction

• A.

1100 N

• B.

100 N

• C.

1400 N

• D.

0 N

B. 100 N
Explanation
The sum of the forces in the x-direction can be determined by subtracting the force of friction from the horizontal force exerted by the draft horse. In this case, the horizontal force exerted by the horse is 600 N and the force of friction is 500 N. Therefore, the sum of the forces in the x-direction is 600 N - 500 N = 100 N.

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• 10.

### A draft horse exerts a horizontal force of 600 N dragging a log, on which the force of friction is 500 N. The force due to gravity on the log is 700 N and the ground exerts an upward force of 700 N on it.c.Determine the sum of the forces in the y-direction

• A.

100 N

• B.

700 N

• C.

0 N

• D.

1400 N

C. 0 N
Explanation
The sum of the forces in the y-direction is 0 N because the force due to gravity on the log (700 N) is balanced by the upward force exerted by the ground (700 N). This means that the log is not accelerating vertically and there is no net force acting on it in the y-direction.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Oct 23, 2014
Quiz Created by
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