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Midterm Practice Quiz 2Instructions: Read each questions and circle the correct answer.1) If no external forces act on a moving object, it willA) continue moving at the same speed.B) move slower and slower until it finally stops.C) come to an abrupt halt.D) none of the above2) A hockey puck sliding across the ice finally comes to rest becauseA) it seeks its proper and natural state.B) of friction.C) that's just the way it is.3) A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity isA) equal to its weight.B) equal to its weight divided by its mass.C) equal to its mass times its weight.D) none of the above4) While you are standing in the aisle of a bus, the driver suddenly makes a left turn. You lurch to the right due toA) an unbalanced force.B) your tendency to keep moving forward.C) an equilibrium challenge.5) A force is a vector quantity because it has bothA) magnitude and direction.B) mass and velocity.C) action and reaction counterparts.D) speed and direction.6) A block pulled to the left with 15 N and to the right with 5 N at the same time experiences a net force of A) 5 N.B) 10 N.C) 15 N.D) 20 N.7) The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity isA) more than 10 N.B) less than 10 N.C) 10 N.8) The speedometer of an automobile readsA) average speed.B) instantaneous speed.C) accelerated speed.9) When you walk at an average speed of 4 m/s, in 5 s you'll cover a distance ofA) 2 m.B) 10 m.C) 15 m.D) 20 m.10) A vehicle undergoes acceleration when itA) gains speed.B) loses speed.C) changes its direction.D) all of the above11) The average speed of a horse that gallops 10 kilometers in 30 minutes isA) 15 km/h.B) 20 km/h.C) 30 km/h.D) 40 km/h.12) If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration isA) 3 m/s2.B) 6 m/s2.C) 60 m/s2.D) 600 m/s2.13) A cart maintains a constant velocity of 100 m/s for 10 seconds. During this interval its acceleration isA) zero.B) 1 m/s2.C) 10 m/s2.D) none of the above14) A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration isA) zero.B) 1 m/s2.C) 10 m/s2.D) none of the above15) A rock dropped from a 5-m height accelerates at 10 m/s2 and strikes the ground 1 s later. If the rock is dropped from a height of 2.5 m, its acceleration of fall is A) half.B) the same.C) twice.D) four times as much.16) A car's speed 3 seconds after accelerating from rest at 2 m/s2 isA) 2 m/s.B) 3 m/s.C) 4 m/s.D) 6 m/s.17) The time it takes a car to attain a speed of 30 m/s when accelerating from rest at 2 m/s2 isA) 2 s.B) 15 s.C) 30 s.D) 60 s.E) none of the above18) What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed of 20 m/s?A) 1 m/s2B) 2 m/s2C) 3 m/s2D) 4 m/s2E) 5 m/s219) Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration? A) 0.25 m/s2B) 2.8 m/s2C) 4.0 m/s2D) 10 m/s2E) 40 m/s220) A freely-falling watermelon falls with constantA) velocity.B) speed.C) acceleration.D) distances each successive second.21) If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will beA) 50 m/s.B) 500 m/s.C) 3000 m/s.D) 3600 m/s.22) An apple falls from a tree and hits the ground 5 meters below with a speed of aboutA) 5 m/s.B) 10 m/s.C) 15 m/s.D) 20 m/s.23) If a stone falls to the bottom of a mineshaft in 6 seconds, then the depth of the shaft is aboutA) 60 m.B) 120 m.C) 180 m.D) more than 200 m.24) If a freely falling object were equipped with a speedometer, its speed reading would increase each second by aboutA) 5 m/s.B) 10 m/s.C) 15 m/s.D) a variable amount.E) depends on its initial speed25) If a freely falling object were equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second byA) 10 m/s.B) 20 m/s.C) 30 m/s.D) 40 m/s.E) depends on its initial speed26) An object falls freely from rest on a planet where the acceleration due to gravity is 20 m/s2. After 5 seconds, the object will have a speed ofA) 5 m/s.B) 10 m/s.C) 20 m/s.D) 50 m/s.E) 100 m/s.27) An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as on Earth. In the first 5 seconds it falls a distance ofA) 100 m.B) 150 m.C) 250 m.D) 500 m.E) none of the above28) The time it takes a projectile fired straight up at 10 m/s to reach the top of its path is aboutA) 1 s.B) 2 s.C) 10 s.D) not enough information 29) A pot that falls from a ledge and hits the ground 45 m below hits the ground atA) 30 m/s.B) 60 m/s.C) 120 m/s.D) more than 120 m/s.30) Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, one second later the rock's speed isA) zero.B) 5 m/s.C) 10 m/s.D) 15 m/s.E) none of the above31) If you double the net force on an object, you'll double itsA) acceleration.B) speed.C) velocity.D) all the above32) A 10-N falling object encounters 4 N of air resistance. The net force on the object isA) 0 N.B) 4 N.C) 6 N.D) 10 N.E) none of the above33) A 1-kg mass at the Earth's surface weighsA) 1 N.B) 5 N.C) 10 N.D) 12 N.E) none of the above34) The mass of a lamb that weights 110 N is aboutA) 1 kg.B) 11 kg.C) 110 kg.D) 1100 kg.E) none of the above35) A bag of groceries that has a mass of 10 kilograms weighs aboutA) 1 N.B) 10 N.C) 100 N.D) 1000 N.E) greater than 1000 N.36) Which has zero acceleration? An objectA) at rest.B) moving at constant velocity.C) in mechanical equilibrium.D) all of the aboveE) none of the above37) A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?A) 500 NB) 1000 NC) 1500 ND) 2000 NE) none of these38) A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is the mass of the car?A) 500 kgB) 1000 kgC) 1500 kgD) 3000 kgE) none of these39) Nellie pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration?A) 0.3 m/s2B) 3.0 m/s2C) 10 m/s2D) 30 m/s2E) 300 m/s240) A rock is thrown vertically into the air. At the top of its path the net force on it isA) less than mg.B) mg.C) more than mg.41) A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000 N. What is the jet's acceleration when taking off?A) 0.25 m/s2B) 1 m/s2C) 2 m/s2D) 4 m/s2E) none of the above42) If more horizontal force is applied to a sliding object than is needed to maintain a constant velocity, the objectA) accelerates in the direction of the applied force.B) accelerates opposite the direction of the applied force.C) experiences greater friction.D) none of the above43) An object released from rest on another planet requires one second to fall a distance of 6 meters. What is the acceleration due to gravity on this planet?A) 3 m/s2B) 6 m/s2C) 12 m/s2D) 15 m/s2E) none of the above44) A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration of the car?A) 110 m/s2B) 220 m/s2C) 800 m/s2D) 880 m/s2E) need more information45) A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block isA) 1 m/s2.B) 2 m/s2.C) 5 m/s2.D) 10 m/s2.E) none of the above46) A 1000-kg automobile enters a freeway on-ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds. How far does the automobile travel during that time?A) 100 mB) 200 mC) 300 mD) 400 mE) none of the above47) A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. The speed of the car just before the brakes were applied wasA) 1.2 m/s.B) 15 m/s.C) 30 m/s.D) 45 m/s.E) none of the above48) Suzie Skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on Suzie is thenA) 90 N.B) 250 N.C) 410 N.D) 500 N.E) none of the above49) When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by theA) ball.B) floor.C) need more information50) The winner in a tug-of-war exerts the greatest force onA) the opponent.B) his or her end of the rope.C) the ground.51) When you walk, you push on the floor to the left and the floorA) also pushes on you to the left.B) pushes you to the right.C) both of these simultaneously.D) can only wish it could push on you.E) none of the above52) For every action force, there must be a reaction force thatA) acts in the same direction.B) is slightly smaller in magnitude than the action force.C) is slightly larger in magnitude than the action force.D) is equal in magnitude.53) When a karate chop breaks a board with a 3000-N blow, the amount of force that acts on the hand isA) zero.B) 1500 N.C) 3000 N.D) 6000 N.54) When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat isA) less than 1000 N.B) more than 1000 N.C) 1000 N.D) need more information55) An automobile and a golf cart traveling at the same speed collide head-on. The impact force isA) greater on the automobile.B) greater on the golf cart.C) the same for both.56) A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be theA) Volkswagen.B) Mack truck.C) same for both.57) A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact isA) greater on the bug.B) greater on the car.C) the same for both.58) Joshua is attracted toward Earth by a 500-N gravitational force. The Earth is attracted toward Joshua with a force ofA) zero.B) 250 N.C) 500 N.D) 1000 N.59) The force that propels a cannonball when fired from a cannon isA) huge compared to the recoil force on the cannon.B) equal and opposite to the force the ball exerts on the cannon.C) in some cases, equal and opposite to the force the ball exerts on the cannon.60) When a cannonball is fired from a cannon, which undergoes the greater acceleration?A) the cannonballB) the recoiling cannonC) both the same61) A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum isA) zero.B) twice.C) four times as much.D) unchanged.62) The speed of a 4-kg ball with a momentum of 12 kg m/s isA) 3 m/s.B) 4 m/s.C) 12 m/s.D) 48 m/s.E) none of the above63) The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s isA) 4 kg.B) 12 kg.C) 16 kg.D) 144 kg.E) none of these64) It is correct to say that impulse is equal toA) momentum.B) a corresponding change in momentum.C) force multiplied by the distance it acts.D) velocity multiplied by time.65) Compared with falling on a stone floor, a wine glass may not break when it falls on a carpeted floor because theA) carpeted floor provides a smaller impulse.B) stopping time is shorter on the carpet.C) stopping time is longer on the carpet.D) carpet provides a smaller impulse and a longer time.66) To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because theA) force of contact is reduced.B) relative velocity is less.C) time of contact is increased.D) time of contact is decreased.E) none of the above67) The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s isA) 1000 N.B) 2000 N.C) 3000 N.D) 4000 N.E) 5000 N.68) A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum ofA) 0 kg m/s.B) 1 kg m/s.C) 2 kg m/s.D) 5 kg m/s.E) more than 5 kg m/s.69) A 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil velocity of the rifle is aboutA) 0.001 m/s.B) 0.01 m/s.C) 0.1 m/s.D) 1 m/s.E) none of these70) A 5000-kg freight car moving at 2 m/s collides with a 10,000-kg freight car at rest. They couple upon collision and move away atA) 2 m/s.B) 1 m/s.C) 2/3 m/s.D) 1/3 m/s.71) According to Newton, the greater the masses of interacting objects, theA) less the gravitational force between them.B) greater the gravitational force between them.C) greater the force between them by the square of the masses.72) According to Newton, when the distance between two interacting objects doubles, the gravitational force isA) half.B) one-quarter.C) the same.D) twice as much.E) four times as much.73) If Earth's radius somehow increased with no change in mass, your weight wouldA) increase also.B) decrease.C) stay the same.74) If the Sun were twice as massiveA) its pull on Earth would double.B) the pull of Earth on the Sun would double.C) both of theseD) neither of these75) Two objects move toward each other due to gravity. As the objects get closer and closer, the force between themA) increases.B) decreases.C) remains constant.ABDBABCBDDBBABBDBDCCCBCBBECAABACCBCDDCBBCACBACCDBCBDCCCACCBABBCBCCBCDCBBBCA ................
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