Physics Fall Semester Set 2: Chapters 5-9

Transcription

1 Chapter 5 and 6 1) Which of the following is considered to be a scalar quantity? a b. 2 cm south c. 32 nanometers to the left d. 5 liters 2) If an airplane flies in the same direction as the wind, is the following statement true or false? The velocity of the plane is the sum of the airplanes velocity and relative to to the air and the winds velocity relative to the ground. a. True b. False 3) Which of the following describes the relationship between the horizontal and vertical components of velocity for a projectile? a. Equal b. Opposite c. Independent d. Dependent 4) As a basketball and a ping pong ball are dropped at the same time at the same height (in the absence of air resistance) which ball will have the greater force acting on it? a. The basketball b. The ping pong ball c. They both have the same force acting on them 5) The path of the projectile with a constant horizontal motion and a downward acceleration due to gravity is a/an a. Gentle slope b. Constant slope c. A curved path d. Parabola

2 6) As Adam falls from a high-flying stationary helicopter (before he deploys his parachute), his velocity increases and his acceleration. a. Decreases b. Increases c. Remains the same 7) The horizontal component of velocity for a projectile varies with time, even with no air resistance. a. True b. False 8) The horizontal component of velocity for a projectile is a. Zero b. Positive c. Negative d. Constant 9) Which of the following would not be considered a projectile? a. A tennis ball thrown through the air b. A golf ball rolling down a golf course green c. A volley ball going straight up d. A soccer ball rolling off the table 10) Which of the following is not true concerning Newton s Second Law of Motion? a. Acceleration is directly proportional to the net force b. The direction of acceleration is the same as the net force c. Acceleration is inversely proportional to mass d. Net force and mass are always equal 11) A 100-N force is used to accelerate a large push cart across the floor. How much force is necessary to push the cart twice as fast? a. 50N b. 100N c. 150N d. 200N

3 12) An object accelerates when a net force is applied to it. Which of the following conditions would double the objects acceleration? a. Doubling the mass b. Dividing the force in two (1) Doubling the mass and dividing the force c. Dividing the mass in half 13) Wind velocity can be represented as a vector. a. True b. False 14) Which of the following is identified as a diagonal vector constructed from two other vectors acting as sides? a. Component b. Resultant c. Vector quantities d. Scalar numbers 15) An object that moves through the air or space with only air resistance, gravity and horizontal motion is referred to as.. a. Trajectory b. Free fall c. Projectile d. A rock 16) The path of a moving object in air is called a. Trajectory b. Free fall c. Projectile d. A rock

4 17) Which of the following forces causes acceleration? a. Balance b. Negligible c. Zero d. Unbalanced 18) The vertical component of velocity for a projectile varies with time, even with no air resistance. a. True b. False 19) The horizontal component of a projectile s velocity is independent of a. The vertical component of its velocity b. The range of the projectile c. Time elapsed 20) What is the vertical component of velocity for a projectile at the peak of its trajectory? a. Zero b. Positive c. Negative d. Constant with the value of gravity 21) What two things are required for a vector quantity? a. Force and time b. Direction and magnitude c. Temperature and time d. Direction and mass 22) Which of the following is true concerning acceleration? a. Balanced forces cause acceleration b. The forces acting on an object at rest are unbalanced c. A net force acting on an object causes acceleration d. Force is not required for an object to accelerate

5 23) A football is thrown into the air between 10 and 90 degrees. At the top of the ball s path, it s velocity is a. Entirely vertical b. Entirely horizontal c. Both horizontal and vertical d. There is not enough information given to determine the answer 24) A ball is dropped off the edge of a desk. Another ball rolls off the desk at the same time. Which of the following represents the relationship of the vertical components of both balls? a. Equal b. Zero c. Opposite d. Constant 25) The term used to describe the event when an object moves with only gravity impacting it a. Trajectory b. Free fall c. Projectile d. A weapon Chapter 7 and 8 26) On roller blades you horizontally toss a ball away from you. The mass of the ball is one tenth your mass. Compared with the speed you give to the ball, your recoil speed will ideally be a) one tenth as much. b) the same. c) ten times as much. d) 100 times as much.

6 27) When a falling object bounces, as it hits the ground its change in momentum and the impulse on it is a) less than for stopping. b) greater than for stopping. c) the same as it is for stopping. d) the same as it was when dropped. 28) The impulse-momentum relationship is a direct result of Newton s a) first law. b) second law. c) third law. d) law of gravity. 29) When the speed of an object is doubled, its momentum a) remains unchanged in accord with the conservation of momentum. b) doubles. c) quadruples. d) Decreases. 30) A force interaction requires at least a(n) a) single force. b) pair of forces. c) action force. d) reaction force. 31) Whenever one object exerts a force on a second object, the second object exerts a force on the first that is a) opposite in direction and equal in magnitude at the same time. b) in the same direction and equal in magnitude a moment later. c) opposite in direction and greater in magnitude at the same time. d) in the same direction and weaker in magnitude a moment later.

7 32) The force that directly propels a motor scooter along a highway is that provided by the a) engine. b) fuel. c) tires. d) road. 33) When you jump vertically upward, strictly speaking, you cause Earth to a) move downward. b) also move upward with you. c) remain stationary. d) move sideways a bit. 34) A system undergoes acceleration only when acted on by a(n) a) net force. b) pair of forces. c) action and reaction forces. d) internal interactions. 35) If a net force acts on a horse while it is pulling a wagon, the horse a) accelerates. b) is restrained. c) is pulled backward by an equal and opposite net force. d) cannot move. 36) At a pizza shop, the cook throws the pizza dough in the air. The amount of force the cook exerts on the dough depends on the a) mass of the dough. b) strength of the cook. c) weight of the dough. d) height of the cook.

8 True (A) or False (B) 37) Whenever one object exerts a force on a second object, the second object always exerts the same force amount of force back on the first object. 38) A rocket ship is pushed forward by gases that are forced out the back of the ship 39) In order to make a cart move forward, a horse must pull harder on the cart than the cart pulls on the horse. 40) If a bicycle and a parked car have a head-on collision, the force of impact is greater on the bicycle. 41) The Earth and Moon pull on each other with equal amounts of force. Multiple Choice 42) A high school student hits a nail with a hammer. During the collision, there is a force a) on the hammer but not on the nail. b) on the nail but not on the hammer c) on the hammer and the nail d) on the board only 43) A 500N woman sits on the floor. She exerts a force on the floor of a. 1000N b. 500N c. 250N d. 50N

9 44) Forces always occur a) when velocities are constant b) as single quantities c) in pairs d) in triplets Physics Fall Semester Set 2: Chapters ) An unfortunate bug splatters against the windshield of a moving car. Compared to the deceleration of the car, the deceleration of the bug is a) larger b) Smaller c) the same 46) A horse pulls on a wagon at rest; the wagon pulls back equally as much on the horse. Will the wagon be set in motion? a) No, because the factors cancel each other out! b) Yes, because there is a net force acting on the wagon c) Yes, because there is a time delay between action and reaction d) Yes, because the horse s pull on the wagon is larger than the wagon s pull on the horse. True (A) or False (B) 47) If the net external force acting on a system is zero, then the total momentum of the system is zero 48) Impulses are smaller when bouncing takes place 49) The padding of a cars dashboard lengthens the time of a passenger s impact during a collision 50) If a net force acts on a system, the system s momentum will change.

10 Multiple Choice 51) Which has more momentum, a large truck at 30mph or a small truck at 30mph? a) the large truck b) the small truck c) They both have the same momentum 52) Compared to a sports car moving at 30 mph, the same car moving at 60 mph has a) the same momentum b) twice as much momentum c) four times as much momentum d) no momentum 53) If the momentum of an object changes and the mass remains the same constant a) its velocity is changing b) it is accelerating c) it is decelerating d) all of the above are correct 54) If Superman is at rest in space throws an asteroid that has more mass than him, then which moves faster? a) the asteroid b) Superman c) they both move at the same speed