# Exam 3 Quiz 4

10 Questions | Attempts: 200  Settings  • 1.
A newton is equivalent to which of the following quantities?
• A.

Kg

• B.

Kg•m/s^2

• C.

Kg•m/s

• D.

Kg•(m/s)^2

• 2.
Which statement about the acceleration of an object is correct?
• A.

The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the mass of the object.

• B.

The acceleration of an object is directly proportional to the net external force acting on the object and directly proportional to the mass of the object.

• C.

The acceleration of an object is inversely proportional to the net external force acting on the object and inversely proportional to the mass of the object.

• D.

The acceleration of an object is inversely proportional to the net external force acting on the object and directly proportional to the mass of the object.

• 3.
A truck and a car uniformly accelerate from rest to a velocity of 3.0 m/s in equal time intervals. The truck is ten times as massive as the car. Which of the following statements is correct?
• A.

The acceleration of the truck is 1/10 that of the car.

• B.

The truck travels 1/10 the distance of the car.

• C.

The force on the truck is 10 times the force on the car.

• D.

All of the above

• 4.
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.

• 5.
Which are simultaneous equal but opposite forces resulting from the interaction of two objects?
• A.

Net external forces

• B.

Gravitational forces

• C.

Field forces

• D.

Action-reaction pairs

• 6.
Newton’s third law of motion involves the interactions of
• A.

One object and one force

• B.

Two objects and one force.

• C.

One object and two forces

• D.

Two objects and two forces.

• 7.
A hammer drives a nail into a piece of wood. Identify an action-reaction pair in this situation.
• A.

The nail exerts a force on the hammer; the hammer exerts a force on the wood.

• B.

The hammer exerts a force on the nail; the wood exerts a force on the nail.

• C.

The hammer exerts a force on the nail; the nail exerts a force on the hammer.

• D.

The hammer exerts a force on the nail; the hammer exerts a force on the wood.

• 8.
A batter strikes a baseball with a bat. Identify an action-reaction pair and describe the forces exerted by each.
• A.

The batter exerts a force on the bat; the ball exerts a force on the bat

• B.

The batter exerts a force on the bat; the bat exerts a force on the batter.

• C.

The bat exerts a force on the batter; the bat exerts a force on the ball.

• D.

The ball exerts a force on the bat; the bat exerts a force on the batter.

• 9.
Two students reach for a jar of mustard at the same time. One student pulls to the left with a force of 13.2 N, while the other student pulls to the right with a force of 12.9 N. If the jar has a net acceleration of 0.44 m/s2 to the left, what is the mass of the jar?
• A.

0.13 kg

• B.

11.48 kg

• C.

0.68 kg

• D.

59.32 kg

• 10.
A certain cable of an elevator is designed to exert a force of 4.5 ´ 104 N. If the maximum acceleration that a loaded car can withstand is 3.5 m/s2 (the current fastest elevators in the world undergo an acceleration of less than 3.2 m/s2), what is the combined mass of the car and its contents?
• A.

12,857 kg

• B.

14,063 kg

• C.

157,500 kg

• D.

144,000 kg

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