Physics Ch.5 Test

26. A 1.5 kg hawk is flying near Earth. What is the hawk's weight? A. 1.5 N B. 6.53 N C. 14.7 N D. 19.4 N

C. 14.7 N. 1.5 kg * 9.8 (gravity) = 14.7 N

21. How much force is required to accelerate a 2 kg mass at 3 m/s^2 A. 1.5 N B. 0.67 N C. 6 N D. 9 N

C. 6 N

28. A boy sits on a sled that weighs 60 N total. If the coefficient of friction is .1, what is the force of friction? A. 600 N B. 0.0016 N C. 6 N D. 12 N

C. 6 N

40. The force of sliding friction is always more than the force of static friction.

True. Sliding friction is how much force is required to move an object.

23. What is the acceleration of a 10kg mass pushed by 5 N force? A. 0.5 m/s/s B. 5.88 m/s/s C. 0.73 m/s/s D. 0.17 m/s/s

A. 0.5 m/s/s. 5 N / 10 KG = 0.5 m/s/s

29. A piece of sandpaper has a coefficient of friction of 0.6. A block is pushed across the surface with a constant velocity by a force of 100 N. What is the mass of the block? A. 17 kg B. 6.1 kg C. 60 kg D. 166.7 kg

A. 17 kg

16. Which statement about the normal force on an object is FALSE? A. It is parallel to the surface upon which the object is resting. B. It is perpendicular to the surface upon which the object is resting. C. It is equal to the weight of the object. D. It is in the opposite direction as gravity.

A. It is parallel to the surface upon which the object is resting is false about normal force.

8. Newton's 2nd law states the acceleration of an object is inversely proportional to A. The mass of the object B. The inertia of the object C. Gravity D. The acceleration of the object

A. The mass of the object

9. Which of the following does NOT represent Newton's second law? A. a = m/F B. m = F/a C. F = ma D. a = F/m

A. a = m/f

22. Given a force of 100 N and an acceleration of 10m/s^2, what is the mass? A. 0.1 kg B. 10 kg C. 1 kg D. 1000 kg

B. 10 kg. 100/10ms^2 = 10.

27. What is them ass of an astronaut who weighs 175 N on the moon? (g = 1.6 m/s/s) A. 18 kg B. 109 kg C. 86 kg D. 280 kg

B. 109 kg. 175/1.6 = 109 kg

25. What is the net force on an object of mass 5.0 kg if its speed is changed from 20m/s to 60 m/s in 7.0 seconds? A. 1.14 N B. 28.57 N C. 34.65 N D. 45.21 N

B. 28.57 N. 40/7 = 5.7 * 5.0 KG = 28.57 N

13. Let's say your Physics book has a mass of 3 kg on the Earth. What would be the mass of your book on Jupiter where the acceleration of gravity is much higher than Earth's? A. Less than 3 kg B. 3 kg C. More than 3 kg D. 0 kg

B. Mass does not change, regardless of the strength or weakness of gravity.

2. The fundamental force that holds the nucleus of atoms together is called A. The Weak Nuclear force B. The Strong Nuclear force C. Electromagnetic Force D. Frictional Force

B. The fundamental force that holds the nucleus of atoms together is the STRONG NUCLEAR FORCE.

15. The normal force of (Fn) refers to A. the parallel contact force exerted by a surface on another object. B. the perpendicular force exerted by a surface on another object C. the tension exerted by a surface on a rope. D. the parallel acceleration of a body at terminal velocity

B. the perpendicular force exerted by a surface on another object

5. Which of the following is NOT an example of Newton's First Law of Motion? A. The need for seatbelts in cars B. An astronaut drifting in space C. A spacecraft slowing down and stopping in out space D. A hockey puck traveling the length of an ice rink

C. A spacecraft slowing down and stopping in space is not an example of Newton's first law.

1. Which one of the following is NOT one of the four fundamental forces? A. Gravity B. Strong Nuclear Force C. Friction D. Electromagnetic

C. Friction is not a fundamental force.

10. The example of why your hand hurts when you pound a desk is best explained by A. Newton's first law B. Newton's second law C. Newton's third law D. Fig Newton's law

C. Newton's third law

11. Which of Newton's laws of motion best explains the recoil or kickback of a gun when fired? A. Newton's first law B. Newton's second law C. Newton's third law D. Newton's fourth law

C. Newton's third law

7. Which of the following is NOT true? A. The force on an object is equal to the mass of the object multiplied by acceleration. B. The force exerted on an object is directly proportional to the acceleration of the object. C. An object moving at constant velocity always has a net force acting on it. D. An object moving with constant acceleration always has a net force acting on it.

C. Objects do not require a constant force to maintain a constant acceleration.

17. The static friction force is A. The force needed to keep an object moving at a constant velocity across a surface. B. The force needed to bring an object to rest. C. The minimum force required to overcome static friction and move an object. D. equal to the net force on an object.

C. The minimum force required to overcome static friction and move an object.

3. A Force is A. an object's inertia B. Usually measured in kg C. a push or pull D. usually measured in grams

C. a push or pull

19. Which of the following forces does NOT act on an object sliding down an inclined plane? A. force of gravity B. force of friction C. equilibrium force D. normal force

C. equilibrium force does NOT act on an object sliding down an inclined plane.

18. The coefficient of sliding friction is NOT A. constant for any given surface B. designated by the symbol mu. C. more than the coefficient of friction of static friction on the same surface. D. equal to the quotient of the friction of force and normal force (Ff/ Fn)

C. more than the coefficient of friction of static friction on the same surface. The friction of a surface does not change unless something changes about the surface.

30. A block has a mass of 500 kg. If a force of 500 N is necessary to slide the block with a constant velocity, what is the coefficient of friction between the 2 surfaces? A. 1.0 B. 0.4 C. 0.6 D. 0.1

D. 0.10. 500/500 = 1/10 = .10

12. The Weight of an object is A. equal to its mass added to gravity B. equal to its mass divided by gravity C. equal to its force due to friction D. equal to its force due to gravity

D. The weight of an object is equal to its force due to gravity

14. The Weight of an object A. is always equal to its mass B. is always more than its mass C. is always less than its mass D. can be more, less, or the same as its mass depending on the acceleration due to gravity

D. can be more, less, or the same as its mass depending on the acceleration due to gravity

4. Newton's 1st Law states an object at rest or in uniform straight line motion will A. continue unless acted upon by gravity B. continue unless acted upon by inertia C. continue and eventually come to rest D. continue unless acted upon by an unbalanced force

D. continue unless acted upon by an unbalanced force

20. When the drag force (air resistance) on an object falling through the air equals the force of gravity, the object has reached A. terminal force. B. terminal acceleration. C. terminal illness. D. terminal velocity.

D. terminal velocity

36. A Newton is the amount of force applied to a 10 g object that will cause it to have an acceleration of 1 m/s^2.

False.

34. Force is a scalar quantity.

False. Force is not a scalar quantity. A scalar quantity is a one dimensional unit, like temperature or weight.

31. Kinematics is the study of why objects move

False. Kinematics is the study of objects in motion.

39. Your weight always remains the same no "matter" where you are located.

False. Your weight is dependent on gravity.

32. The strongest of the four fundamental forces is gravity.

True.

33. All matter has inertia.

True.

35. Net force and acceleration always occur in the same direction.

True.

37. The net force on an object is the resultant, or sum, of all the force vectors acting on the object.

True.

38. Forces always occur in "action-reaction" pairs.

True.