Question

9 You stand on a scale in your bathroom, which says your weight is 800 N. What is the Newton's 3rd Law pair to your weight? A) The force of the scale pushing you up with 800 N of force B) The force of the scale pushing you up with 800 kg of force C) The force of gravity you exert on the Earth, pulling it up with 800 N of force D) The force of you pushing down on the scale with 800 N of force E) The force of gravity the Earth exerts on you, pulling you down with 800 N of force 10 A ball is released from rest above the ground and allowed to fall vertically downwards. While falling, which pair of responses correctly describes the ball's vertical speed and vertical net force? Vertical Speed Vertical Net Force A) Constant Balanced B) Increases Balanced C) Constant Unbalanced D) Increases Unbalanced 11 A marble and a bowling ball are dropped from rest from the same height above the ground. If air resistance can be ignored, which one reaches the ground first? A) The marble, because it has less mass B) The marble, because it has less weight C) Both reach the ground at the same time D) The bowling ball, because it has more mass E) The bowling ball, because it has more weight 12 A 3-kg ball is thrown vertically upwards with a speed of 12 m/s. At the top of its path, what is the magnitude of the net force acting on the ball? A) 7.2 N B) 30 N C) 21.6 N D) 10 N E) 36 N 13 A book is at rest atop a horizontal tabletop. You begin pushing the book with a constant force, causing the book to move horizontally with constant velocity. Which statement is true? A) There must be friction acting on the book, and it must be weaker than your push force B) There must not be friction acting on the book, because the book isn't slowing down C) There must be friction acting on the book, and it must be equal to your push force D) There must not be friction acting on the book, because the book isn't speeding up E) There must be friction acting on the book, and it must be stronger than your push force 14 A bus breaks down on the highway. A car gets behind the bus and slowly pushes the bus, accelerating it down the road. During the acceleration, the force the car exerts on the bus is: A) greater than the force the bus exerts on the car, and in the same direction B) less than the force the bus exerts on the car, and in the opposite direction C) exactly the same as the force the bus exerts on the car, and in the same direction D) greater than the force the bus exerts on the car, but in the opposite direction E) exactly the same as the force the bus exerts on the car, but in the opposite direction 15 Suppose an object is at rest at a particular instant in time. Is it possible for the forces acting on the object to be unbalanced at that instant? A) No, unbalanced forces always produce motion according to Newton's 1st Law B) No, unbalanced forces always produce motion according to Newton's 2nd Law C) No, unbalanced forces always produce motion according to Newton's 3rd Law D) Yes, if the object is changing direction E) Yes, if the object has constant velocity 16 When you stand on a scale, what does the scale reading actually show? A) Your mass B) Your weight C) The force you're exerting on the scale D) The force gravity exerts on the scale E) Your acceleration

          9 You stand on a scale in your bathroom, which says your weight is 800 N. What is the Newton's 3rd Law pair to your weight?
A) The force of the scale pushing you up with 800 N of force
B) The force of the scale pushing you up with 800 kg of force
C) The force of gravity you exert on the Earth, pulling it up with 800 N of force
D) The force of you pushing down on the scale with 800 N of force
E) The force of gravity the Earth exerts on you, pulling you down with 800 N of force

10 A ball is released from rest above the ground and allowed to fall vertically downwards. While falling, which pair of responses correctly describes the ball's vertical speed and vertical net force?
Vertical Speed Vertical Net Force
A) Constant Balanced
B) Increases Balanced
C) Constant Unbalanced
D) Increases Unbalanced

11 A marble and a bowling ball are dropped from rest from the same height above the ground. If air resistance can be ignored, which one reaches the ground first?
A) The marble, because it has less mass
B) The marble, because it has less weight
C) Both reach the ground at the same time
D) The bowling ball, because it has more mass
E) The bowling ball, because it has more weight

12 A 3-kg ball is thrown vertically upwards with a speed of 12 m/s. At the top of its path, what is the magnitude of the net force acting on the ball?
A) 7.2 N
B) 30 N
C) 21.6 N
D) 10 N
E) 36 N

13 A book is at rest atop a horizontal tabletop. You begin pushing the book with a constant force, causing the book to move horizontally with constant velocity. Which statement is true?
A) There must be friction acting on the book, and it must be weaker than your push force
B) There must not be friction acting on the book, because the book isn't slowing down
C) There must be friction acting on the book, and it must be equal to your push force
D) There must not be friction acting on the book, because the book isn't speeding up
E) There must be friction acting on the book, and it must be stronger than your push force

14 A bus breaks down on the highway. A car gets behind the bus and slowly pushes the bus, accelerating it down the road. During the acceleration, the force the car exerts on the bus is:
A) greater than the force the bus exerts on the car, and in the same direction
B) less than the force the bus exerts on the car, and in the opposite direction
C) exactly the same as the force the bus exerts on the car, and in the same direction
D) greater than the force the bus exerts on the car, but in the opposite direction
E) exactly the same as the force the bus exerts on the car, but in the opposite direction

15 Suppose an object is at rest at a particular instant in time. Is it possible for the forces acting on the object to be unbalanced at that instant?
A) No, unbalanced forces always produce motion according to Newton's 1st Law
B) No, unbalanced forces always produce motion according to Newton's 2nd Law
C) No, unbalanced forces always produce motion according to Newton's 3rd Law
D) Yes, if the object is changing direction
E) Yes, if the object has constant velocity

16 When you stand on a scale, what does the scale reading actually show?
A) Your mass
B) Your weight
C) The force you're exerting on the scale
D) The force gravity exerts on the scale
E) Your acceleration

9 You stand on a scale in your bathroom, which says your weight is 800 N. What is the Newton's 3rd Law pair to your weight?
A) The force of the scale pushing you up with 800 N of force
B) The force of the scale pushing you up with 800 kg of force
C) The force of gravity you exert on the Earth, pulling it up with 800 N of force
D) The force of you pushing down on the scale with 800 N of force
E) The force of gravity the Earth exerts on you, pulling you down with 800 N of force

10 A ball is released from rest above the ground and allowed to fall vertically downwards. While falling, which pair of responses correctly describes the ball's vertical speed and vertical net force?
Vertical Speed Vertical Net Force
A) Constant Balanced
B) Increases Balanced
C) Constant Unbalanced
D) Increases Unbalanced

11 A marble and a bowling ball are dropped from rest from the same height above the ground. If air resistance can be ignored, which one reaches the ground first?
A) The marble, because it has less mass
B) The marble, because it has less weight
C) Both reach the ground at the same time
D) The bowling ball, because it has more mass
E) The bowling ball, because it has more weight

12 A 3-kg ball is thrown vertically upwards with a speed of 12 m/s. At the top of its path, what is the magnitude of the net force acting on the ball?
A) 7.2 N
B) 30 N
C) 21.6 N
D) 10 N
E) 36 N

13 A book is at rest atop a horizontal tabletop. You begin pushing the book with a constant force, causing the book to move horizontally with constant velocity. Which statement is true?
A) There must be friction acting on the book, and it must be weaker than your push force
B) There must not be friction acting on the book, because the book isn't slowing down
C) There must be friction acting on the book, and it must be equal to your push force
D) There must not be friction acting on the book, because the book isn't speeding up
E) There must be friction acting on the book, and it must be stronger than your push force

14 A bus breaks down on the highway. A car gets behind the bus and slowly pushes the bus, accelerating it down the road. During the acceleration, the force the car exerts on the bus is:
A) greater than the force the bus exerts on the car, and in the same direction
B) less than the force the bus exerts on the car, and in the opposite direction
C) exactly the same as the force the bus exerts on the car, and in the same direction
D) greater than the force the bus exerts on the car, but in the opposite direction
E) exactly the same as the force the bus exerts on the car, but in the opposite direction

15 Suppose an object is at rest at a particular instant in time. Is it possible for the forces acting on the object to be unbalanced at that instant?
A) No, unbalanced forces always produce motion according to Newton's 1st Law
B) No, unbalanced forces always produce motion according to Newton's 2nd Law
C) No, unbalanced forces always produce motion according to Newton's 3rd Law
D) Yes, if the object is changing direction
E) Yes, if the object has constant velocity

16 When you stand on a scale, what does the scale reading actually show?
A) Your mass
B) Your weight
C) The force you're exerting on the scale
D) The force gravity exerts on the scale
E) Your acceleration

Added by Thomas B.

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