Exam 3 PreAP Physics Numbers 6-10

1. 8. In the free-body diagram shown to the right, which of the following is the gravitational force acting on the car?

A. 5800 N

B. 14 700 N

C. 775 N

D. 13 690 N

The correct answer is b. 14,700 N. This is the gravitational force acting on the car because it is the only force shown in the free-body diagram that is directed downwards. The magnitude of the force is determined by the weight of the car, which is directly proportional to its mass. Therefore, the larger the mass of the car, the greater the gravitational force acting on it.

Explanation

The correct answer is b. 14,700 N. This is the gravitational force acting on the car because it is the only force shown in the free-body diagram that is directed downwards. The magnitude of the force is determined by the weight of the car, which is directly proportional to its mass. Therefore, the larger the mass of the car, the greater the gravitational force acting on it.

2. 10. In the free-body diagram shown to the right, which of the following is the gravitational force acting on the balloon?

A. 1520 N

B. 4050 N

C. 950 N

D. 5120 N

The gravitational force acting on the balloon is 4050 N. This can be determined by using the formula F = mg, where F is the force, m is the mass of the object, and g is the acceleration due to gravity. In this case, the mass of the balloon is not given, but we can assume it is constant. Therefore, the force of gravity acting on the balloon is proportional to its mass. Since the force of gravity is directly proportional to the mass, we can conclude that the gravitational force acting on the balloon is 4050 N.

Explanation

The gravitational force acting on the balloon is 4050 N. This can be determined by using the formula F = mg, where F is the force, m is the mass of the object, and g is the acceleration due to gravity. In this case, the mass of the balloon is not given, but we can assume it is constant. Therefore, the force of gravity acting on the balloon is proportional to its mass. Since the force of gravity is directly proportional to the mass, we can conclude that the gravitational force acting on the balloon is 4050 N.

3. 6. The length of a force vector represents the

A. cause of the force.

B. direction of the force.

C. magnitude of the force.

D. type of force.

The length of a force vector represents the magnitude of the force. The magnitude of a force refers to the strength or intensity of the force, regardless of its direction. In vector representation, the length of the vector is used to indicate the magnitude of the force, while the direction of the vector represents the direction of the force. Therefore, option c is the correct answer as it accurately describes the meaning of the length of a force vector.

Explanation

The length of a force vector represents the magnitude of the force. The magnitude of a force refers to the strength or intensity of the force, regardless of its direction. In vector representation, the length of the vector is used to indicate the magnitude of the force, while the direction of the vector represents the direction of the force. Therefore, option c is the correct answer as it accurately describes the meaning of the length of a force vector.

4. 9. In the free-body diagram shown above, which of the following is the normal force acting on the car?

A. 5800 N

B. 14 700 N

C. 775 N

D. 13 690 N

The normal force is the force exerted by a surface to support the weight of an object resting on it. In this case, the car is resting on a surface and the normal force is equal in magnitude and opposite in direction to the weight of the car. Since the weight of the car is 13,690 N, the normal force acting on the car is also 13,690 N.

Explanation

The normal force is the force exerted by a surface to support the weight of an object resting on it. In this case, the car is resting on a surface and the normal force is equal in magnitude and opposite in direction to the weight of the car. Since the weight of the car is 13,690 N, the normal force acting on the car is also 13,690 N.

5. 7. A free-body diagram represents all of the following except

A. the object.

B. forces as vectors.

C. forces exerted by the object.

D. forces exerted on the object.

A free-body diagram is a visual representation that shows the forces acting on an object. It includes all the forces exerted on the object, such as gravitational force, normal force, frictional force, and any other external forces. However, it does not represent the forces that the object itself exerts on other objects or surfaces. Therefore, option c, "forces exerted by the object," is not included in a free-body diagram.

Explanation

A free-body diagram is a visual representation that shows the forces acting on an object. It includes all the forces exerted on the object, such as gravitational force, normal force, frictional force, and any other external forces. However, it does not represent the forces that the object itself exerts on other objects or surfaces. Therefore, option c, "forces exerted by the object," is not included in a free-body diagram.

Exam 3 Preap Physics Numbers 6-10