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A 10-kg block is connected to a 40-kg block as shown in the figure.The surface on that the blocks slide is frictionless.A force of 50 N pulls the blocks to the right. A 10-kg block is connected to a 40-kg block as shown in the figure.The surface on that the blocks slide is frictionless.A force of 50 N pulls the blocks to the right. -What is the magnitude of the tension in the rope that connects the two blocks? A) 0 N B) 10 N C) 20 N D) 40 N E) 50 N -What is the magnitude of the tension A 10-kg block is connected to a 40-kg block as shown in the figure.The surface on that the blocks slide is frictionless.A force of 50 N pulls the blocks to the right. -What is the magnitude of the tension in the rope that connects the two blocks? A) 0 N B) 10 N C) 20 N D) 40 N E) 50 N in the rope that connects the two blocks?


A) 0 N
B) 10 N
C) 20 N
D) 40 N
E) 50 N

Correct Answer

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Which one of the following actions will increase the frictional force on the block?


A) increasing the contact surface area
B) decreasing the contact surface area
C) increasing the weight of the block
D) decreasing the speed of the block
E) increasing the angle made by the rope

Correct Answer

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A rock is suspended from a string; and it accelerates upward.Which statement is true concerning the tension in the string?


A) The tension points downward.
B) The tension is less than the weight of the rock.
C) The tension is equal to the weight of the rock.
D) The tension is greater than the weight of the rock.
E) The tension is independent of the magnitude of the rock's acceleration.

Correct Answer

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Complete the following statement: The term net force most accurately describes


A) the mass of an object
B) the inertia of an object.
C) the quantity that causes a displacement.
D) the quantity that keeps an object moving.
E) the quantity that changes the velocity of an object.

Correct Answer

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A rock is suspended from a string and moves downward at constant speed.Which statement is true concerning the tension in the string if air resistance is ignored?


A) The tension is zero newtons.
B) The tension points downward.
C) The tension is equal to the weight of the rock.
D) The tension is less than the weight of the rock.
E) The tension is greater than the weight of the rock.

Correct Answer

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An astronaut orbits the earth in a space capsule whose height above the earth is equal to the earth's radius.How does the weight of the astronaut in the capsule compare to her weight on the earth?


A) Her weight is equal to zero newtons.
B) Her weight is approximately equal to one-fourth her weight on earth.
C) Her weight is approximately equal to one-half of her weight on earth.
D) Her weight is approximately equal to one-third of her weight on earth.
E) Her weight is approximately equal to one-sixteenth her weight on earth.

Correct Answer

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Two sleds are hooked together in tandem as shown in the figure.The front sled is twice as massive as the rear sled. The sleds are pulled along a frictionless surface by an applied force Two sleds are hooked together in tandem as shown in the figure.The front sled is twice as massive as the rear sled. The sleds are pulled along a frictionless surface by an applied force .The tension in the rope between the sleds is . Determine the ratio of the magnitudes of the two forces, . A) 0.25 B) 0.33 C) 0.50 D) 0.67 E) 2.0 .The tension in the rope between the sleds is Two sleds are hooked together in tandem as shown in the figure.The front sled is twice as massive as the rear sled. The sleds are pulled along a frictionless surface by an applied force .The tension in the rope between the sleds is . Determine the ratio of the magnitudes of the two forces, . A) 0.25 B) 0.33 C) 0.50 D) 0.67 E) 2.0 . Determine the ratio of the magnitudes of the two forces, Two sleds are hooked together in tandem as shown in the figure.The front sled is twice as massive as the rear sled. The sleds are pulled along a frictionless surface by an applied force .The tension in the rope between the sleds is . Determine the ratio of the magnitudes of the two forces, . A) 0.25 B) 0.33 C) 0.50 D) 0.67 E) 2.0 . Two sleds are hooked together in tandem as shown in the figure.The front sled is twice as massive as the rear sled. The sleds are pulled along a frictionless surface by an applied force .The tension in the rope between the sleds is . Determine the ratio of the magnitudes of the two forces, . A) 0.25 B) 0.33 C) 0.50 D) 0.67 E) 2.0


A) 0.25
B) 0.33
C) 0.50
D) 0.67
E) 2.0

Correct Answer

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Determine the magnitude of the acceleration of the rock down the inclined plane if the rope breaks?


A) zero m/s2
B) 4.9 m/s2
C) 5.7 m/s2
D) 8.5 m/s2
E) 9.8 m/s2

Correct Answer

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A 20-kg crate is suspended from a fixed, horizontal beam by two vertical ropes.What is the approximate tension in each rope?


A) 10 N
B) 40 N
C) 100 N
D) 200 N
E) 390 N

Correct Answer

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A 8-kg block is set moving with an initial speed of 6 m/s on a rough horizontal surface.If the force of friction is 12 N, approximately how far does the block travel before it stops?


A) 1.5 m
B) 3 m
C) 6 m
D) 9 m
E) 12 m

Correct Answer

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A 4-kg block is connected by means of a massless rope to a 2-kg block as shown in the figure.Complete the following statement: If the 4-kg block is to begin sliding, the coefficient of static friction between the 4-kg block and the surface must be A 4-kg block is connected by means of a massless rope to a 2-kg block as shown in the figure.Complete the following statement: If the 4-kg block is to begin sliding, the coefficient of static friction between the 4-kg block and the surface must be A) less than zero. B) greater than 2. C) greater than 1, but less than 2. D) greater than 0.5, but less than 1. E) less than 0.5, but greater than zero.


A) less than zero.
B) greater than 2.
C) greater than 1, but less than 2.
D) greater than 0.5, but less than 1.
E) less than 0.5, but greater than zero.

Correct Answer

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A 44-kg child steps onto a scale and the scale reads 430 N.What is the magnitude of the normal force acting on the child?


A) 44 N
B) 215 N
C) 430 N
D) 645 N
E) 860 N

Correct Answer

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Two blocks rest on a horizontal frictionless surface as shown.The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks.A 30-N force is applied to the bottom block as suggested in the figure. Two blocks rest on a horizontal frictionless surface as shown.The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks.A 30-N force is applied to the bottom block as suggested in the figure. -What is the acceleration of the two block system? A) 1 m/s<sup>2</sup> B) 2 m/s<sup>2</sup> C) 3 m/s<sup>2</sup> D) 6 m/s<sup>2</sup> E) 15 m/s<sup>2</sup> -What is the acceleration of the "two block" system?


A) 1 m/s2
B) 2 m/s2
C) 3 m/s2
D) 6 m/s2
E) 15 m/s2

Correct Answer

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What is the magnitude of What is the magnitude of , the normal force on the crate? A) 57 N B) 80 N C) 160 N D) 196 N E) 230 N , the normal force on the crate?


A) 57 N
B) 80 N
C) 160 N
D) 196 N
E) 230 N

Correct Answer

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An apple crate with a weight of 225 N accelerates along a frictionless surface as the crate is pulled with a force of 14.5 N as shown in the drawing. What is the horizontal acceleration of the crate? An apple crate with a weight of 225 N accelerates along a frictionless surface as the crate is pulled with a force of 14.5 N as shown in the drawing. What is the horizontal acceleration of the crate? A) 1.40 m/s<sup>2</sup> B) 0.427 m/s<sup>2</sup> C) 1.29 m/s<sup>2</sup> D) 0.597 m/s<sup>2</sup> E) 0.644 m/s<sup>2</sup>


A) 1.40 m/s2
B) 0.427 m/s2
C) 1.29 m/s2
D) 0.597 m/s2
E) 0.644 m/s2

Correct Answer

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When the net force that acts on a hockey puck is 12 N, the puck accelerates at a rate of 48 m/s2.Determine the mass of the puck.


A) 0.25 kg
B) 1.0 kg
C) 5.0 kg
D) 2.5 kg
E) 2.0 kg

Correct Answer

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With one exception, each of the following units can be used to express mass.What is the exception?


A) newton
B) slug
C) gram
D) N•s2/m
E) kilogram

Correct Answer

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A system of two cables supports a 150-N ball as shown. A system of two cables supports a 150-N ball as shown. -A woman stands on a bathroom scale in an elevator that is not moving.The scale reads 500 N.The elevator then moves downward at a constant velocity of 5 m/s.What does the scale read while the elevator descends with constant velocity? A) 100 N B) 250 N C) 500 N D) 600 N E) 750 N -A woman stands on a bathroom scale in an elevator that is not moving.The scale reads 500 N.The elevator then moves downward at a constant velocity of 5 m/s.What does the scale read while the elevator descends with constant velocity?


A) 100 N
B) 250 N
C) 500 N
D) 600 N
E) 750 N

Correct Answer

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Two blocks rest on a horizontal frictionless surface as shown.The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks.A 30-N force is applied to the bottom block as suggested in the figure. Two blocks rest on a horizontal frictionless surface as shown.The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks.A 30-N force is applied to the bottom block as suggested in the figure. -Note the following situations: In which case will the magnitude of the normal force on the block be equal to (Mg + F sin \theta ) ? A) case 1 only B) case 2 only C) both cases 1 and 2 D) both cases 2 and 3 E) cases 1, 2, and 3 -Note the following situations: Two blocks rest on a horizontal frictionless surface as shown.The surface between the top and bottom blocks is roughened so that there is no slipping between the two blocks.A 30-N force is applied to the bottom block as suggested in the figure. -Note the following situations: In which case will the magnitude of the normal force on the block be equal to (Mg + F sin \theta ) ? A) case 1 only B) case 2 only C) both cases 1 and 2 D) both cases 2 and 3 E) cases 1, 2, and 3 In which case will the magnitude of the normal force on the block be equal to (Mg + F sin θ\theta ) ?


A) case 1 only
B) case 2 only
C) both cases 1 and 2
D) both cases 2 and 3
E) cases 1, 2, and 3

Correct Answer

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Two forces act on a 4.5-kg block resting on a frictionless surface as shown.What is the magnitude of the horizontal acceleration of the block? Two forces act on a 4.5-kg block resting on a frictionless surface as shown.What is the magnitude of the horizontal acceleration of the block? A) 1.8 m/s<sup>2</sup> B) 1.2 m/s<sup>2</sup> C) 0.82 m/s<sup>2</sup> D) 3.2 m/s<sup>2</sup> E) 8.9 m/s<sup>2</sup>


A) 1.8 m/s2
B) 1.2 m/s2
C) 0.82 m/s2
D) 3.2 m/s2
E) 8.9 m/s2

Correct Answer

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