Question 1

You push on box G that is next to box H, causing both boxes to slide along the floor, as shown in the figure. The reaction force to your push is

Accepted Answer

A) the push of box G on box H. 
B) the push of box H on box G. 
C) the push of box G against you. 
D) the upward force of the floor n box G. 
E) the acceleration of box G. 
A) the push of box G on box H. 
B) the push of box H on box G. 
C) the push of box G against you. 
D) the upward force of the floor n box G. 
E) the acceleration of box G. C

Question 2

The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

Accepted Answer

A) Mass is less, weight is the same. 
B) Mass is the same, weight is less. 
C) Both mass and weight are less. 
D) Both mass and weight are the same. 
A) Mass is less, weight is the same. 
B) Mass is the same, weight is less. 
C) Both mass and weight are less. 
D) Both mass and weight are the same. B

Question 3

If the rockets of a spaceship in outer space (far from all gravity)suddenly lose power and go off, the spaceship will gradually slow to a stop.

Accepted Answer

A) True 
 B)False  False

Question 4

A certain aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is a constant 445,000 N, what is the speed of the airplane 10.0 s later?

Accepted Answer

A) 10.0 m/s 
B) 12.2 m/s 
C) 14.0 m/s 
D) 18.0 m/s 
E) 20.0 m/s 
A) 10.0 m/s 
B) 12.2 m/s 
C) 14.0 m/s 
D) 18.0 m/s 
E) 20.0 m/s

Question 5

A truck is using a hook to tow a car whose mass is one quarter that of the truck. If the force exerted by the truck on the car is 6000 N, then the force exerted by the car on the truck is

Accepted Answer

A) 1500 N. 
B) 24000 N. 
C) 6000 N. 
D) 12000 N. 
E) We need to know if the car is accelerating to answer this question. 
A) 1500 N. 
B) 24000 N. 
C) 6000 N. 
D) 12000 N. 
E) We need to know if the car is accelerating to answer this question.

Question 6

If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet, what is the acceleration due to gravity on that planet?

Accepted Answer

A) 70.4 m/s2 
B) 51.4 m/s2 
C) 61.2 m/s2 
D) 81.0 m/s2 
A) 70.4 m/s2 
B) 51.4 m/s2 
C) 61.2 m/s2 
D) 81.0 m/s2

Question 7

A flatbed truck is carrying an 800-kg load of timber that is not tied down. The maximum friction force between the truck bed and the load is 2400 N. What is the greatest acceleration that the truck can have without losing its load?

Accepted Answer

The answer of A flatbed truck is carrying an 800-kg...

Question 8

A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true?

Accepted Answer

A) During the collision, the force on the truck is greater then the force on the car. 
B) During the collision, the force on the truck is equal to the force on the car. 
C) During the collision, the force on the truck is smaller than the force on the car. 
D) The truck did not slow down during the collision, but the car did. 
E) The car did not slow down during the collision, but the truck did. 
A) During the collision, the force on the truck is greater then the force on the car. 
B) During the collision, the force on the truck is equal to the force on the car. 
C) During the collision, the force on the truck is smaller than the force on the car. 
D) The truck did not slow down during the collision, but the car did. 
E) The car did not slow down during the collision, but the truck did.

Question 9

What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?

Accepted Answer

A) 69.9 kg 
B) 68.5 kg 
C) 71.3 kg 
D) 72.7 kg 
A) 69.9 kg 
B) 68.5 kg 
C) 71.3 kg 
D) 72.7 kg

Question 10

A small car and a large SUV are at a stoplight. The car has a mass equal to half that of the SUV, and the SUV can produce a maximum accelerating force equal to twice that of the car. When the light turns green, both drivers push their accelerators to the floor at the same time. Which vehicle pulls ahead of the other vehicle after a few seconds?

Accepted Answer

A) The car pulls ahead. 
B) The SUV pulls ahead. 
C) It is a tie. 
A) The car pulls ahead. 
B) The SUV pulls ahead. 
C) It is a tie.

Question 11

An object of weight W is in freefall close to the surface of Earth. The magnitude of the force that the object exerts on Earth is

Accepted Answer

A) greater than W. 
B) less than W. 
C) equal to W. 
D) zero. 
E) cannot be determined without knowing the relative masses of the object and the earth. 
A) greater than W. 
B) less than W. 
C) equal to W. 
D) zero. 
E) cannot be determined without knowing the relative masses of the object and the earth.

Question 12

A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope.
(a)What is the magnitude of the force exerted by the rope on the crate?
(b)What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s2?

Accepted Answer

Question 13

A 10-kg object is hanging by a very light wire in an elevator that is traveling upward. The tension in the rope is measured to be 75 N. What are the magnitude and direction of the acceleration of the elevator?

Accepted Answer

The answer of A 10-kg object is hanging by a...

Question 14

A 958-N rocket is coming in for a vertical landing. It starts with a downward speed of 25 m/s and must reduce its speed to 0 m/s in 8.0 s for the final landing.
(a)During this landing maneuver, what must be the thrust due to the rocket's engines?
(b)What must be the direction of the engine thrust force?

Accepted Answer

The answer of A 958-N rocket is coming in for...

Question 15

In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.

Accepted Answer

A) True 
 B)False

Question 16

A bucket is being lowered by a very light rope with a constant downward velocity. The tension in the rope must be

Accepted Answer

A) equal to the weight of the bucket. 
B) greater than the weight of the bucket. 
C) less than the weight of the bucket. 
A) equal to the weight of the bucket. 
B) greater than the weight of the bucket. 
C) less than the weight of the bucket.

Question 17

The figure shows an object's acceleration-versus-force graph. What is the mass of this object?

Accepted Answer

A) 2.5 g 
B) 1.6 g 
C) 630 g 
D) 400,000 g 
A) 2.5 g 
B) 1.6 g 
C) 630 g 
D) 400,000 g

Question 18

A 590-kg rocket is at rest on the launch pad. What upward thrust force is needed to accelerate the rocket uniformly to an upward speed of 28 m/s in 3.3 s?

Accepted Answer

The answer of A 590-kg rocket is at rest on...

Question 19

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is

Accepted Answer

A) speeding up. 
B) slowing down. 
C) changing direction. 
D) speeding up and changing direction. 
E) slowing down and changing direction. 
A) speeding up. 
B) slowing down. 
C) changing direction. 
D) speeding up and changing direction. 
E) slowing down and changing direction.

Question 20

Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling. The wire makes an angle θ with the ceiling, as shown in the figure. Which one of the following conditions must be true about the tension T in the wire?

Accepted Answer

A) T sin θ = W 
B) T cos θ = W 
C) T tan θ = W 
D) T = W 
E) T = ma 
A) T sin θ = W 
B) T cos θ = W 
C) T tan θ = W 
D) T = W 
E) T = ma

Exam 4: Forces and Newtons Laws of Motion

You push on box G that is next to box H, causing both boxes to slide along the floor, as shown in the figure. The reaction force to your push is

The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth?

If the rockets of a spaceship in outer space (far from all gravity)suddenly lose power and go off, the spaceship will gradually slow to a stop.

A certain aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is a constant 445,000 N, what is the speed of the airplane 10.0 s later?

A truck is using a hook to tow a car whose mass is one quarter that of the truck. If the force exerted by the truck on the car is 6000 N, then the force exerted by the car on the truck is

If I weigh 741 N on Earth at a place where g = 9.80 m/s2 and 5320 N on the surface of another planet, what is the acceleration due to gravity on that planet?

A flatbed truck is carrying an 800-kg load of timber that is not tied down. The maximum friction force between the truck bed and the load is 2400 N. What is the greatest acceleration that the truck can have without losing its load?

A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true?

What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g = 9.80 m/s2?

An object of weight W is in freefall close to the surface of Earth. The magnitude of the force that the object exerts on Earth is

A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s2 by means of a rope. (a)What is the magnitude of the force exerted by the rope on the crate? (b)What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s2?

A 10-kg object is hanging by a very light wire in an elevator that is traveling upward. The tension in the rope is measured to be 75 N. What are the magnitude and direction of the acceleration of the elevator?

In a collision between a huge SUV and a small hybrid car, the SUV exerts a larger force on the hybrid than the hybrid exerts on the SUV.

A bucket is being lowered by a very light rope with a constant downward velocity. The tension in the rope must be

The figure shows an object's acceleration-versus-force graph. What is the mass of this object?

A 590-kg rocket is at rest on the launch pad. What upward thrust force is needed to accelerate the rocket uniformly to an upward speed of 28 m/s in 3.3 s?

You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front of the train. From this observation, you can conclude that this train is

Inside of a train a ball of weight W is hanging by a light wire at rest from the ceiling. The wire makes an angle θ with the ceiling, as shown in the figure. Which one of the following conditions must be true about the tension T in the wire?

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If I weigh 741 N on Earth at a place where g = 9.80 m/s² and 5320 N on the surface of another planet, what is the acceleration due to gravity on that planet?

What is the mass of an object that experiences a gravitational force of 685 N near Earth's surface where g = 9.80 m/s²?

A 40-kg crate is being lowered with a downward acceleration is 2.0 m/s² by means of a rope. (a)What is the magnitude of the force exerted by the rope on the crate? (b)What would be the magnitude of the force exerted by the rope if the crate were being raised with an acceleration of 2.0 m/s²?