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A car rounds a 75-m radius curve at a constant speed of 18 m/s.A ball is suspended by a string from the ceiling the car and moves with the car.The angle between the string and the vertical is:


A) 0°
B) 1.4°
C) 24°
D) 90°
E) cannot be found without knowing the mass of the ball

Correct Answer

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A crate resting on a rough horizontal floor is to be moved horizontally.The coefficient of static friction is 0.40.To start the crate moving with the weakest possible applied force, in what direction should the force be applied?


A) Horizontal
B) 24° below the horizontal
C) 22° above the horizontal
D) 24° above the horizontal
E) 66° below the horizontal

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Block A, with a mass of 10 kg, rests on a 30°incline.The coefficient of kinetic friction is 0.20.The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top.Block B, with a mass of 8.0 kg, is attached to the dangling end of the string.The acceleration of B is: Block A, with a mass of 10 kg, rests on a 30°incline.The coefficient of kinetic friction is 0.20.The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top.Block B, with a mass of 8.0 kg, is attached to the dangling end of the string.The acceleration of B is: A) 0.69 m/s<sup>2</sup>, up B) 0.69 m/s<sup>2</sup>, down C) 2.6 m/s<sup>2</sup>, up D) 2.6 m/s<sup>2</sup>, down E) 0 m/s<sup>2</sup>


A) 0.69 m/s2, up
B) 0.69 m/s2, down
C) 2.6 m/s2, up
D) 2.6 m/s2, down
E) 0 m/s2

Correct Answer

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A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal surface.If the coefficients of friction are A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal surface.If the coefficients of friction are = 0.5 and = 0.4, the magnitude of the frictional force on the block is: A) 12 N B) 16 N C) 20 N D) 24 N E) 40 N = 0.5 and A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal surface.If the coefficients of friction are = 0.5 and = 0.4, the magnitude of the frictional force on the block is: A) 12 N B) 16 N C) 20 N D) 24 N E) 40 N = 0.4, the magnitude of the frictional force on the block is:


A) 12 N
B) 16 N
C) 20 N
D) 24 N
E) 40 N

Correct Answer

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A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a force A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a force as shown.In the diagram f is the magnitude of the force of friction, N is the magnitude of the normal force, and F<sub>g</sub><sub> </sub>is the magnitude of the force of gravity.Which of the following must be true? A) P = f and N = F<sub>g</sub> B) P = f and N > F<sub>g</sub> C) P > f and N < F<sub>g</sub><sub> </sub> D) P > f and N = F<sub>g</sub><sub> </sub> E) none of these as shown.In the diagram f is the magnitude of the force of friction, N is the magnitude of the normal force, and Fg is the magnitude of the force of gravity.Which of the following must be true? A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a force as shown.In the diagram f is the magnitude of the force of friction, N is the magnitude of the normal force, and F<sub>g</sub><sub> </sub>is the magnitude of the force of gravity.Which of the following must be true? A) P = f and N = F<sub>g</sub> B) P = f and N > F<sub>g</sub> C) P > f and N < F<sub>g</sub><sub> </sub> D) P > f and N = F<sub>g</sub><sub> </sub> E) none of these


A) P = f and N = Fg
B) P = f and N > Fg
C) P > f and N < Fg
D) P > f and N = Fg
E) none of these

Correct Answer

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A horizontal force of 5.0 N pushes a 0.50-kg block against a vertical wall.The block is initially at rest.If A horizontal force of 5.0 N pushes a 0.50-kg block against a vertical wall.The block is initially at rest.If = 0.60 and = 0.50, the acceleration of the block is: A) 0 m/s<sup>2</sup> B) 3.8 m/s<sup>2</sup> C) 4.8 m/s<sup>2</sup> D) 8.0 m/s<sup>2</sup> E) 9.8 m/s<sup>2</sup> = 0.60 and A horizontal force of 5.0 N pushes a 0.50-kg block against a vertical wall.The block is initially at rest.If = 0.60 and = 0.50, the acceleration of the block is: A) 0 m/s<sup>2</sup> B) 3.8 m/s<sup>2</sup> C) 4.8 m/s<sup>2</sup> D) 8.0 m/s<sup>2</sup> E) 9.8 m/s<sup>2</sup> = 0.50, the acceleration of the block is:


A) 0 m/s2
B) 3.8 m/s2
C) 4.8 m/s2
D) 8.0 m/s2
E) 9.8 m/s2

Correct Answer

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The magnitude of the force required to cause an 0.04-kg object to move at 0.6 m/s in a circle of radius 1.0 m is:


A) 2.4 * 10-2 N
B) 1.4 *10-2 N
C) 1.4* 10-2 N
D) 2.4*2 *10-2 N
E) 3.13 N

Correct Answer

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A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a force A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a force as shown.In the diagram f is the magnitude of the force of friction, N is the magnitude of the normal force, and F<sub>g</sub> is the magnitude of the force of gravity.Which of the following must be true? A) P = f and N = F<sub>g</sub><sub> </sub> B) P = f and N > F<sub>g</sub><sub> </sub> C) P > f and N < F<sub>g</sub> D) P > f and N = F<sub>g</sub> E) none of these as shown.In the diagram f is the magnitude of the force of friction, N is the magnitude of the normal force, and Fg is the magnitude of the force of gravity.Which of the following must be true? A boy pulls a wooden box along a rough horizontal floor at constant speed by means of a force as shown.In the diagram f is the magnitude of the force of friction, N is the magnitude of the normal force, and F<sub>g</sub> is the magnitude of the force of gravity.Which of the following must be true? A) P = f and N = F<sub>g</sub><sub> </sub> B) P = f and N > F<sub>g</sub><sub> </sub> C) P > f and N < F<sub>g</sub> D) P > f and N = F<sub>g</sub> E) none of these


A) P = f and N = Fg
B) P = f and N > Fg
C) P > f and N < Fg
D) P > f and N = Fg
E) none of these

Correct Answer

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A block of mass m is pulled at constant velocity along a rough horizontal floor by an applied force A block of mass m is pulled at constant velocity along a rough horizontal floor by an applied force as shown.The magnitude of frictional force is: A) T cos \theta B) T sin \theta C) 0 D) mg E) mg cos \theta as shown.The magnitude of frictional force is: A block of mass m is pulled at constant velocity along a rough horizontal floor by an applied force as shown.The magnitude of frictional force is: A) T cos \theta B) T sin \theta C) 0 D) mg E) mg cos \theta


A) T cos θ\theta
B) T sin θ\theta
C) 0
D) mg
E) mg cos θ\theta

Correct Answer

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A block is first placed on its long side and then on its short side on the same inclined plane.The block slides down the plane on its short side but remains at rest on its long side.A possible explanation is: A block is first placed on its long side and then on its short side on the same inclined plane.The block slides down the plane on its short side but remains at rest on its long side.A possible explanation is: A) the short side is smoother B) the frictional force is less because the contact area is less C) the center of gravity is higher in the second case D) the normal force is less in the second case E) the force of gravity is more nearly down the plane in the second case


A) the short side is smoother
B) the frictional force is less because the contact area is less
C) the center of gravity is higher in the second case
D) the normal force is less in the second case
E) the force of gravity is more nearly down the plane in the second case

Correct Answer

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A ball of mass m is thrown downward from the edge of a cliff with an initial speed that is three times the terminal speed.Initially the drag force on it is


A) upward and greater than mg
B) upward and less than mg
C) downward and greater than mg
D) downward and less than mg
E) downward and equal to mg

Correct Answer

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A block of mass m is pulled along a rough horizontal floor by an applied force A block of mass m is pulled along a rough horizontal floor by an applied force as shown.The vertical component of the force exerted on the block by the floor is: A) mg B) mg - T cos \theta C) mg + T cos \theta D) mg - T sin \theta E) mg + T sin \theta as shown.The vertical component of the force exerted on the block by the floor is: A block of mass m is pulled along a rough horizontal floor by an applied force as shown.The vertical component of the force exerted on the block by the floor is: A) mg B) mg - T cos \theta C) mg + T cos \theta D) mg - T sin \theta E) mg + T sin \theta


A) mg
B) mg - T cos θ\theta
C) mg + T cos θ\theta
D) mg - T sin θ\theta
E) mg + T sin θ\theta

Correct Answer

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A box with a weight of 50 N rests on a horizontal surface.A person pulls horizontally on it with a force of 15 N and it does not move.To start it moving, a second person pulls vertically upward on the box.If the coefficient of static friction is 0.4, what is the smallest vertical force for which the box moves? A box with a weight of 50 N rests on a horizontal surface.A person pulls horizontally on it with a force of 15 N and it does not move.To start it moving, a second person pulls vertically upward on the box.If the coefficient of static friction is 0.4, what is the smallest vertical force for which the box moves? A) 5 N B) 12 N C) 20 N D) 25 N E) 35 N


A) 5 N
B) 12 N
C) 20 N
D) 25 N
E) 35 N

Correct Answer

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Block A, with a mass of 10 kg, rests on a 30°incline.The coefficient of kinetic friction is 0.20.The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top.Block B, with a mass of 3.0 kg, is attached to the dangling end of the string.The acceleration of B is: Block A, with a mass of 10 kg, rests on a 30°incline.The coefficient of kinetic friction is 0.20.The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top.Block B, with a mass of 3.0 kg, is attached to the dangling end of the string.The acceleration of B is: A) 0.20 m/s<sup>2</sup>, up B) 0.20 m/s<sup>2</sup>, down C) 2.8 m/s<sup>2</sup>, up D) 2.8 m/s<sup>2</sup>, down E) 0 m/s<sup>2</sup>


A) 0.20 m/s2, up
B) 0.20 m/s2, down
C) 2.8 m/s2, up
D) 2.8 m/s2, down
E) 0 m/s2

Correct Answer

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The coefficient of kinetic friction:


A) is in the direction of the frictional force
B) is in the direction of the normal force
C) is the ratio of force to area
D) can have units of newtons
E) none of the above

Correct Answer

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A 5.0-kg crate is on an incline that makes an angle 30° with the horizontal.If the coefficient of static friction is 0.5, the maximum force that can be applied parallel to the plane without moving the crate is:


A) 0 N
B) 3.3 N
C) 21 N
D) 46 N
E) 55 N

Correct Answer

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A brick slides on a horizontal surface.Which of the following will increase the frictional force on it?


A) Putting a second brick on top
B) Decreasing the surface area of contact
C) Increasing the surface area of contact
D) Decreasing the mass of the brick
E) None of the above

Correct Answer

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In uniform circular motion,


A) the acceleration always points away from the center of the circle.
B) the velocity always points towards the center of the circle.
C) the acceleration and the velocity are always parallel.
D) the acceleration and the velocity are always perpendicular.
E) there is no fixed relationship between the direction of the acceleration and the direction of the velocity.

Correct Answer

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A 50-N force is applied to a crate on a horizontal rough floor, causing it to move horizontally.If the coefficient of kinetic friction is 0.50, in what direction should the force be applied to obtain the greatest acceleration?


A) Horizontal
B) 60°above the horizontal
C) 30° above the horizontal
D) 27° above the horizontal
E) 30° below the horizontal

Correct Answer

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A horizontal shove of at least 200-N is required to start moving an 800-N crate initially at rest on a horizontal floor.The coefficient of static friction is:


A) 0.125
B) 0.25
C) 0.50
D) 4.00
E) none of these

Correct Answer

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