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### 35 True/False questions

1. If every force has an equal and opposite reaction, why don't all forces cancel out with each other?The action and reaction forces act on different objects.

2. Sir Isaac Newton was a student and professor at...Cambridge

3. Sir Isaac Newton is credited with inventing...Cambridge

4. Consider the motion of an object acted on by a net force. Which of the following describes a situation that is possible?
a) The net force is negative, the speed is negative, and the acceleration is zero.
b) The net force is negative, the speed is negative, and the acceleration is positive.
c) The net force is positive, and acceleration and speed are also positive.
d) The net force is positive, and the acceleration and speed are negative.
Mass

5. A wagon with a mass of 25 kg has a force of 50 N to the left and forces of 25 N and 10 N to the right. The acceleration of the wagon is...c) It takes more force to stop the 55 kilogram ball because the 55 kilogram ball has more inertia.

6. Three forces are acting on an object. The object is not moving. Two forces are 5 Newtons to the right and 21 Newtons to the left. The third force is...16 Newtons to the right

7. Isabella weighs 130 pounds; Ben weighs 80 kg; Olivia weighs 800 Newtons; and William weighs 118,000 grams. Who weighs the least?Isabella

8. A force of 10 pounds acts on a cart with a weight of 10 pounds. What is the acceleration of the cart?9.79 m/s^2

9. Which of the following MUST have a net force?
a) An object is moving with a constant speed of 4 m/s.
b) An object is at rest with zero speed.
c) An object accelerates from 1 m/s^2 to 2 m/s^2.
d) An object has a mass of 1 kilogram.
d) The speed of an object changes even though no forces are acting on the object.

10. A force of 1 N is the only force exerted on a block, and the acceleration of the block is measured. When the same force is the only force exerted on a second block, the acceleration is five times as large. What can you conclude about the masses of the two blocks?9.79 m/s^2

11. When the punter kicks the football, his foot feels the ball because...The ball exerts a force on his foot as a reaction to the force of his foot on the ball.

12. An experiment compares the time it takes to accelerate two carts from 1 m/s to 2 m/s. Different amounts of force are tested. (Refer to table on test) What conclusion is supported by the results of the experiment?Force must be applied to the object.

13. A 2.25 kilogram ball is observed to accelerate at 3,500 m/s^2 as it is hit with a bat. How much force is exerted on the bat by the ball?
a) 7,875 N
b) The same force the bat exerts on the ball
c) 7,875 kg X m/s^2
d) All of the above
d) All of the above

14. A ball with a mass of 55 kilograms is moving at the same speed as a ball with a mass of 35 kilograms. Which of the following statements correctly compares the force required to stop each of the two balls?
a) It takes more force to stop the 35 kilogram ball because the 35 kilogram ball has less inertia.
b) It takes more force to stop the 35 kilogram ball because the 35 kilogram ball has more inertia.
c) It takes more force to stop the 55 kilogram ball because the 55 kilogram ball has more inertia.
d) It takes the same force to stop both ball because they are moving at the same speed.
0.6 m/s^2 to the left

15. The units of force come from Newton's second law. In the metric system, the units for force are...Acceleration is directly proportional to net force and inversely proportional to mass.

16. How much force does it take to slow a car from 43 m/s to 17 m/s in 8 seconds? The mass of the car is 1,800 kg.1.82 m/s^2

17. The Newton is a unit of force that is defined by...Mass

18. Which of the following situations can never happen because it represents a violation of Newton's first law?
a) The acceleration of an object is zero even though gravity exerts a force on the object.
b) The speed of an object is zero, but the object feels a force and its acceleration is not zero.
c) The speed of an object remains the same even when several forces are acting on the object.
d) The speed of an object changes even though no forces are acting on the object.
d) The speed of an object changes even though no forces are acting on the object.

19. If no forces are acting on an object, its motion will...Continue in the same direction with the same speed.

20. Which of the following correctly describes the role of mass in Newton's second law?
a) Mass is a measure of the amount of matter in an object.
b) Mass is a measure of an object's resistance to acceleration.
c) Mass determines how much force an object feels from gravity.
d) Mass is measured in kilograms.
d) The speed of an object changes even though no forces are acting on the object.

21. The engine of a rocket accelerates fuel backward to push the rocket forward. The mass of the rocket is 14,000 kilograms. The rocket accelerates 17 kilograms of fuel backward at 1,500 m/s^2. The forward acceleration of the rocket is...1.82 m/s^2

22. Two objects have the same inertia if...Any action that could change the motion of an object.

23. The same engine is placed in a large truck and a small car. The engine produces the same amount of force between the vehicle and the road in both cases. The car...Has a greater acceleration than the truck because the car has a smaller mass.

24. The inertia of an object comes from its...Any action that could change the motion of an object.

25. What action must be taken to change the motion of an object?The same force causes the same acceleration in both objects.

26. An ice skater feels very little force as she moves in a straight line on her skates. According to Newton's first law, which of the following statements about her motion is TRUE?
a) Her mass decreases to maintain her constant-speed motion.
b) She will stop almost immediately from friction.
c) She will continue to move with exactly the same speed and direction.
d) She must apply force with her skates to turn or to stop.
The total force acting on the object is zero.

27. Which of the following is not true about an action-reaction pair of forces?
a) The action force is applied first and the reaction force appears later at time t.
b) The action force is equal in strength to the reaction force.
c) The action force is opposite in direction to the reaction force.
d) The action force and reaction forces act on different objects.
a) The action force is applied first and the reaction force appears later at time t.

28. Newton's second law states...Acceleration is directly proportional to net force and inversely proportional to mass.

29. "An object that is at rest will remain at rest or an object that is moving will continue to move in a straight line with constant speed, if and only if the net force acting on the object is zero." This statement is called...Newton's first law of motion

30. Force is best defined as...Acceleration is directly proportional to net force and inversely proportional to mass.

31. A volleyball player with a mass of 65 kilograms jumps upward by pushing against the floor with her feet with a force of 1,400 Newtons. Which is the best explanation for why the volleyball player moves upward?
a) The player's weight is reduced by the 1,400 Newton force.
b) The 1,400 Newton force is equal to the force of gravity holding the player down.
c) The floor pushes back upward on the player with a force of 1,400 Newtons, which lifts the player off the ground.
d) The player's feet are connected to the rest of her body and distribute the 1,400 Newton force over the whole body.
c) It takes more force to stop the 55 kilogram ball because the 55 kilogram ball has more inertia.

32. The graph on the board shows the motion of an object moving in a straight line. From the graph, you may conclude that...The total force acting on the object is zero.

33. John is on a skateboard and throws a ball. The skateboard moves in the opposite direction from the thrown ball because...Force must be applied to the object.

34. An object is observed to have an acceleration of 9 m/s^2 when a net force of 63 Newtons is applied. The mass of the object is...7 kg

35. Karate, meaning 'empty hand', was created in the 17th century as a means of self-defense because weapons were outlawed by Japanese rulers. Trained karateists can break a concrete block 3.8 cm thick by moving their hand at 11 m/s to create 3069 N of force. It is hard to believe that something as soft as a hand can really break something as hard as concrete, but in fact the bones in the human hand can withstand up to 40 times that amount of force. This is an example of...Newton's second law of motion