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The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it. What is the acceleration at points A and B? The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it. What is the acceleration at points A and B?

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A: 16 M/S2,...

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A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point down the ramp.


A) True
B) False

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A ball is tossed vertically upward. When it reaches its highest point (before falling back downward)


A) the velocity is zero, the acceleration is directed downward, and the force of gravity acting on the ball is directed downward.
B) the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is zero.
C) the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is directed downward.
D) the velocity and acceleration reverse direction, but the force of gravity on the ball remains downward.
E) the velocity, acceleration, and the force of gravity on the ball all reverse direction.

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The figure shows two forces, each of magnitude 4.6 N, acting on an object. The angle between these forces is 40°, and they make equal angles above and below the horizontal. What third force will cause the object to be in equilibrium (acceleration equals zero) ? The figure shows two forces, each of magnitude 4.6 N, acting on an object. The angle between these forces is 40°, and they make equal angles above and below the horizontal. What third force will cause the object to be in equilibrium (acceleration equals zero) ? A) 8.6 N pointing to the right B) 7.0 N pointing to the right C) 4.3 N pointing to the right D) 3.5 N pointing to the right


A) 8.6 N pointing to the right
B) 7.0 N pointing to the right
C) 4.3 N pointing to the right
D) 3.5 N pointing to the right

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Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? <sub>f</sub> is the force of the floor on the person and <sub>g</sub> is the force of gravity on the person. A) B) C) D) E) f is the force of the floor on the person and Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? <sub>f</sub> is the force of the floor on the person and <sub>g</sub> is the force of gravity on the person. A) B) C) D) E) g is the force of gravity on the person.


A) Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? <sub>f</sub> is the force of the floor on the person and <sub>g</sub> is the force of gravity on the person. A) B) C) D) E)
B) Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? <sub>f</sub> is the force of the floor on the person and <sub>g</sub> is the force of gravity on the person. A) B) C) D) E)
C) Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? <sub>f</sub> is the force of the floor on the person and <sub>g</sub> is the force of gravity on the person. A) B) C) D) E)
D) Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? <sub>f</sub> is the force of the floor on the person and <sub>g</sub> is the force of gravity on the person. A) B) C) D) E)
E) Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? <sub>f</sub> is the force of the floor on the person and <sub>g</sub> is the force of gravity on the person. A) B) C) D) E)

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The graph in the figure shows the x component of the acceleration of a 2.4-kg object as a function of time (in ms). The graph in the figure shows the x component of the acceleration of a 2.4-kg object as a function of time (in ms). (a) At what time(s) does the x component of the net force on the object reach its maximum magnitude, and what is that maximum magnitude? (b) What is the x component of the net force on the object at time t = 0.0 ms and at t = 4.0 ms? (a) At what time(s) does the x component of the net force on the object reach its maximum magnitude, and what is that maximum magnitude? (b) What is the x component of the net force on the object at time t = 0.0 ms and at t = 4.0 ms?

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(a) At 3.0...

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You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. The force acting on you that causes you to fall forward is


A) the force of gravity.
B) the normal force due to your contact with the floor of the bus.
C) the force due to static friction between you and the floor of the bus.
D) the force due to kinetic friction between you and the floor of the bus.
E) No forces were acting on you to cause you to fall.

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The figure shows two forces acting at right angles on an object. They have magnitudes The figure shows two forces acting at right angles on an object. They have magnitudes = 6.3 N and = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ? A) 6.6 N at 162° counterclockwise from <sub>1</sub> B) 6.6 N at 108° counterclockwise from <sub>1</sub> C) 4.2 N at 162° counterclockwise from <sub>1</sub> D) 4.2 N at 108° counterclockwise from <sub>1</sub> = 6.3 N and The figure shows two forces acting at right angles on an object. They have magnitudes = 6.3 N and = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ? A) 6.6 N at 162° counterclockwise from <sub>1</sub> B) 6.6 N at 108° counterclockwise from <sub>1</sub> C) 4.2 N at 162° counterclockwise from <sub>1</sub> D) 4.2 N at 108° counterclockwise from <sub>1</sub> = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ? The figure shows two forces acting at right angles on an object. They have magnitudes = 6.3 N and = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ? A) 6.6 N at 162° counterclockwise from <sub>1</sub> B) 6.6 N at 108° counterclockwise from <sub>1</sub> C) 4.2 N at 162° counterclockwise from <sub>1</sub> D) 4.2 N at 108° counterclockwise from <sub>1</sub>


A) 6.6 N at 162° counterclockwise from The figure shows two forces acting at right angles on an object. They have magnitudes = 6.3 N and = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ? A) 6.6 N at 162° counterclockwise from <sub>1</sub> B) 6.6 N at 108° counterclockwise from <sub>1</sub> C) 4.2 N at 162° counterclockwise from <sub>1</sub> D) 4.2 N at 108° counterclockwise from <sub>1</sub> 1
B) 6.6 N at 108° counterclockwise from The figure shows two forces acting at right angles on an object. They have magnitudes = 6.3 N and = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ? A) 6.6 N at 162° counterclockwise from <sub>1</sub> B) 6.6 N at 108° counterclockwise from <sub>1</sub> C) 4.2 N at 162° counterclockwise from <sub>1</sub> D) 4.2 N at 108° counterclockwise from <sub>1</sub> 1
C) 4.2 N at 162° counterclockwise from The figure shows two forces acting at right angles on an object. They have magnitudes = 6.3 N and = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ? A) 6.6 N at 162° counterclockwise from <sub>1</sub> B) 6.6 N at 108° counterclockwise from <sub>1</sub> C) 4.2 N at 162° counterclockwise from <sub>1</sub> D) 4.2 N at 108° counterclockwise from <sub>1</sub> 1
D) 4.2 N at 108° counterclockwise from The figure shows two forces acting at right angles on an object. They have magnitudes = 6.3 N and = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ? A) 6.6 N at 162° counterclockwise from <sub>1</sub> B) 6.6 N at 108° counterclockwise from <sub>1</sub> C) 4.2 N at 162° counterclockwise from <sub>1</sub> D) 4.2 N at 108° counterclockwise from <sub>1</sub> 1

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Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero? Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero? A) B) C) D) E)


A) Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero? A) B) C) D) E)
B) Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero? A) B) C) D) E)
C) Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero? A) B) C) D) E)
D) Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero? A) B) C) D) E)
E) Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero? A) B) C) D) E)

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A 615 N student standing on a scale in an elevator notices that the scale reads 645 N. From this information, the student knows that the elevator must be moving


A) downward.
B) upward.
C) You cannot tell if it is moving upward or downward.

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