Newton's Laws 2

Two horizontal forces, one 180.0 N and the other 200.0 N, are exerted in opposite directions on a boat on a lake. What is the magnitude of the net horizontal force on the boat?

• A    380.0 N

• B    200.0 N

• C     180.0 N

• D     20.0 N

Two dogs play tug-of-war with a rope toy that has a mass of 0.50 kg. If one dog pulls on the toy with a force of 140.0 N, and the other dog pulls in the opposite direction with a force of 138.0 N, what is the magnitude of the horizontal acceleration of the toy?

• A     9.8 m/s²

• B     8.0 m/s²

• C     4.9 m/s²

• D     4.0 m/s²

What is the magnitude of the force of gravity on a person who has a mass of 80.0 kg?

• A     176 N

• B     686 N

• C     784 N

• D     801 N

A 60.0-kg boy rides in an elevator that accelerates upward at 1.80 m/s². What is the magnitude of the net force exerted on the boy?

• A     9.8 N

• B     108 N

• C     480 N

• D     588 N

The free-body diagrams below show four ways that two different forces could be exerted on an object.

• A     Diagram 1

• B     Diagram 2

• C     Diagram 3

• D     Diagram 4

Two teams, the Fifes and the Drums, are playing tug-of-war. Each team has 3 members. Both teams exert a force of 2002 N on the rope. The rope is not accelerating. What is the net force on the rope?

• A    0 N

• B    333 N

• C    2002 N

• D    4004 N

Two people are paddling together in a canoe. Each exerts a horizontal force of 238 N toward the back of the canoe. What is the net horizontal force on the canoe?

• A    119 N

• B    238 N

• C    476 N

• D    952 N

Refer to item 7 above. If the combined weight of the canoe and the two paddlers is 190 kg, what is the acceleration of the canoe?

• A    0.63 m/s²

• B    1.3 m/s²

• C    2.5 m/s²

• D    5.0 m/s²

The figure shows a bucket hanging motionless from a rope. Assume that the rope has no mass. What is the net force on the bucket?

• A    0.0 N

• B    2.0 N

• C    9.8 N

• D    2.0´10¹ N

What is the tension on the rope?

• A     9.8 N

• B    1.0x10¹ N

• C    14.2 N

• D    2.0x10¹ N