 # SPH3U Exam Review. 1. The property of matter that causes an object to resist changes in its state of motion is called: A. friction B. inertia C. the normal.

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SPH3U Exam Review

1. The property of matter that causes an object to resist changes in its state of motion is called: A. friction B. inertia C. the normal force D. tension

1. The property of matter that causes an object to resist changes in its state of motion is called: A. friction *B. inertia C. the normal force D. tension

2. If the net force on an object is increased, the magnitude of its ______________ increases. A. acceleration B. velocity C. both A and B D. neither A nor B

2. If the net force on an object is increased, the magnitude of its ______________ increases. *A. acceleration B. velocity C. both A and B D. neither A nor B

3. The SI unit for weight is the: A. Joule B. kilogram C. Newton D. pound

3. The SI unit for weight is the: A. Joule B. kilogram *C. Newton D. pound

4. The jerking you feel when the vehicle in which you are riding is stopped suddenly is best explained using which of Newton's Laws? A. Newton's 1 st Law B. Newton's 2 nd Law C. Newton's 3 rd Law D. Universal Gravitation

4. The jerking you feel when the vehicle in which you are riding is stopped suddenly is best explained using which of Newton's Laws? *A. Newton's 1 st Law B. Newton's 2 nd Law C. Newton's 3 rd Law D. Universal Gravitation

5. An object of mass 4 kg is travelling at a constant velocity of 2 m/s [E]. What is the net force on the object? A. 0 N B. 2 N [E] C. 8 N [E] D. It cannot be determined.

5. An object of mass 4 kg is travelling at a constant velocity of 2 m/s [E]. What is the net force on the object? *A. 0 N B. 2 N [E] C. 8 N [E] D. It cannot be determined.

6. If the distance between two objects is halved the gravitational attraction between them is: A. the same B. doubled C. halved D. quadrupled

6. If the distance between two objects is halved the gravitational attraction between them is: A. the same B. doubled C. halved *D. quadrupled

7. Which of Newton's Laws of Motion applies to objects in outer space? A. Newton's 1 st Law B. Newton's 2 nd Law C. Newton's 3 rd Law D. all of the above

7. Which of Newton's Laws of Motion applies to objects in outer space? A. Newton's 1 st Law B. Newton's 2 nd Law C. Newton's 3 rd Law *D. all of the above

8. A magnet is sliding down a fridge door. What is the direction of the normal force acting on the magnet? A. up B. down C. into the door D. out of the door

8. A magnet is sliding down a fridge door. What is the direction of the normal force acting on the magnet? A. up B. down C. into the door *D. out of the door

9. A book of weight 20 N is resting on a table. If a horizontal force of 10 N [right] is applied to the book, the magnitude of the normal force acting on the book will be: A. 0 N B. 10 N C. 20 N D. 30 N

9. A book of weight 20 N is resting on a table. If a horizontal force of 10 N [right] is applied to the book, the magnitude of the normal force acting on the book will be: A. 0 N B. 10 N *C. 20 N D. 30 N

10. Object A of mass 2 kg is attached to Object B of mass 4 kg by a string suspended over a pulley. The tension in the part of the string attached to Object A is __________ the tension in the part of the string attached to Object B. A. the same as B. less than C. greater than D. It cannot be determined.

10. Object A of mass 2 kg is attached to Object B of mass 4 kg by a string suspended over a pulley. The tension in the part of the string attached to Object A is __________ the tension in the part of the string attached to Object B. *A. the same as B. less than C. greater than D. It cannot be determined.

11. An object of weight 40 N is being pushed at constant velocity across a surface with a force of 10 N [right]. What is the force of friction acting on the object? A. 10 N [down] B. 10 N [left] C. 50 N [down] D. 50 N [left]

11. An object of weight 40 N is being pushed at constant velocity across a surface with a force of 10 N [right]. What is the force of friction acting on the object? A. 10 N [down] *B. 10 N [left] C. 50 N [down] D. 50 N [left]

12. A book is resting on a table. The Earth is exerting a gravitational force of 8 N [down] on the book. Which of the following is the reaction force? A. 8 N [up] the table exerts on the book B. 8 N [down] the book exerts on the table C. 8 N [up] the book exerts on the Earth D. There is no reaction force.

12. A book is resting on a table. The Earth is exerting a gravitational force of 8 N [down] on the book. Which of the following is the reaction force? A. 8 N [up] the table exerts on the book B. 8 N [down] the book exerts on the table *C. 8 N [up] the book exerts on the Earth D. There is no reaction force.

13. A block of weight 4.0 N is suspended from the ceiling of an elevator by a piece of string. If the elevator is accelerating at 1.0 m/s 2 [down], the magnitude of the tension in the string is: A. zero B. less than 4.0 N C. 4.0 N D. greater than 4.0 N

13. A block of weight 4.0 N is suspended from the ceiling of an elevator by a piece of string. If the elevator is accelerating at 1.0 m/s 2 [down], the magnitude of the tension in the string is: A. zero *B. less than 4.0 N C. 4.0 N D. greater than 4.0 N

14. Fuzzy dice are hanging from the rear-view mirror of a car that is travelling backward at constant speed. The dice are: A. angled toward the back of the car B. angled toward the front of the car C. hanging straight down D. It cannot be determined.

14. Fuzzy dice are hanging from the rear-view mirror of a car that is travelling backward at constant speed. The dice are: A. angled toward the back of the car B. angled toward the front of the car *C. hanging straight down D. It cannot be determined.

15. Running shoes are designed to do what to the force of friction between the runner and the ground? A. increase B. decrease C. neither A nor B D. alternately A and B

15. Running shoes are designed to do what to the force of friction between the runner and the ground? *A. increase B. decrease C. neither A nor B D. alternately A and B

1. A sled is being pulled rightward across a surface by a horizontal rope tied to it. Draw the FBD for the sled. FAFA FgFg FNFN FfFf

2. If the rope is at an angle above the horizontal, how will the other forces on the sled be affected? Explain why.

Weight will not be affected. Normal force will be decreased because the applied force will have a vertical upward component. Friction will be decreased because the normal force will be decreased.

3. What is the net force acting on the sled? Explain why it is impossible to describe the motion of the sled without more information. The net force equal to the horizontal component of the applied force minus the frictional force (vertical forces cancel out). You don’t know if the sled is speeding up or slowing down because you don’t know which force is larger.

A 0.40-kg cart on a table is attached by a string to a suspended mass of 0.25-kg. A frictional force of 1.2 N opposes the motion of the cart. What is (a) the magnitude of the acceleration of the cart and (b) the tension in the string between the cart and the mass?

A 0.40-kg cart on a table is attached by a string to a suspended mass of 0.25-kg. A frictional force of 1.2 N opposes the motion of the cart. What is (a) the magnitude of the acceleration of the cart

and (b) the tension in the string between the cart and the mass?

A box of mass 15 kg slides across a floor and comes to a complete stop. Its initial speed was 4.2 m/s and  k = 0.30. Find (a) the acceleration of the box and (b) the distance travelled by the box before stopping.

A box of mass 15 kg slides across a floor and comes to a complete stop. Its initial speed was 4.2 m/s and  k = 0.30. Find (a) the acceleration of the box

and (b) the distance travelled by the box before stopping.

Two skaters are standing on ice facing each other. Skater 1 pushes on skater 2 with a force of 70.0 N [E]. The coefficient of friction between the skaters and the ice is 0.10. The mass of skater 1 is 50.0 kg and the mass of skater 2 is 70.0 kg. Calculate the acceleration of each skater.

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