Physics - Wegglab

What type of acceleration does an object moving with constant speed in a circular path experience? A) free fall. B) terminal acceleration. C) constant acceleration. D) linear acceleration. E) centripetal acceleration.When an object experiences uniform circular motion, the direction of the net force is A) in the same direction as the motion of the object. B) in the opposite direction of the motion of the object. C) is directed toward the center of the circular path. D) is directed away from the center of the circular path. E) is dependent on the speed of the object.Consider a particle moving with constant speed such that its acceleration of constant magnitude is always perpendicular to its velocity. A) It is moving in a straight line. B) It is moving in a circle. C) It is moving in a parabola. D) It is moving in a hyperbola. E) None of the above is definitely true all of the time.For an object that travels at a fixed speed along a circular path, the acceleration of the object is A) larger in magnitude the smaller the radius of the circle. B) in the same direction as the velocity of the object. C) smaller in magnitude the smaller the radius of the circle. D) in the opposite direction of the velocity of the object. E) zero.

A 16-kg fish is weighed with two spring scales, each of negligible weight, as shown in Figure 6-4. What will be the readings on the scales? A) The bottom scale will read 16 kg, and the top scale will read zero. B) The sum of the two readings will be 32 kg. C) The top scale will read 16 kg, and the bottom scale will read zero. D) Each scale will show a reading greater than zero and less than 16 kg, but the sum of the two readings will be 16 kg. E) Each scale will read 8 kg.Two masses, m1 and m2, are connected to each other as shown in Figure 6-5. Mass m1 slides without friction on the table surface. Both masses have acceleration of magnitude a as shown. How does the tension in the string compare to the weight, m2 g, of mass m2? A) The tension is equal to m2 g. B) The tension is larger than m2 g. C) The tension is smaller than m2 g. D) It depends on m1 being smaller than m2. E) It depends on m1 being larger than m2.Two identical masses are attached by a light string that passes over a small pulley, as shown in Figure 6-6. The table and the pulley are frictionless. The masses are moving A) with an acceleration less than g. B) at constant speed. C) with an acceleration greater than g. D) with an acceleration equal to g. E) with an acceleration that cannot be determined without additional information.When an object experiences uniform circular motion, the direction of the acceleration is A) in the same direction as the velocity vector. B) in the opposite direction of the velocity vector. C) is directed toward the center of the circular path. D) is directed away from the center of the circular path. E) depends on the speed of the object.

When a car goes around a curve, it has a tendency to skid outwards. Is the frictional force between the tires and the ground that keeps the car from skidding kinetic or static? A) kinetic B) static.A flatbed truck is carrying a crate along a level road. The coefficient of static friction between the load and the bed is 0.40. The truck accelerates forward and the crate stays in its place on the truck bed. In what direction is the force that the bed exerts on the crate? A) forward B) backward C) toward the center of the road D) There is no frictional force because the crate does not move with respect to the bed. E) There is not enough information to answer this question.As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is A) static friction. B) kinetic friction. C) a combination of static and kinetic friction. D) neither static nor kinetic friction, but some other type of friction. E) It is impossible to tell what type of friction acts in this situation.

Two objects have masses m and 5m, respectively. They both are placed side by side on a frictionless inclined plane and allowed to slide down from rest. A) It takes the lighter object 5 times longer to reach the bottom of the incline than the heavier. B) It takes the lighter object 10 times longer to reach the bottom of the incline than the heavier. C) It takes the heavier object 5 times longer to reach the bottom of the incline than the lighter. D) It takes the heavier object 10 times longer to reach the bottom of the incline than the lighter. E) The two objects reach the bottom of the incline at the same time.Its more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity, because A) The normal force is greater when the carton is at rest. B) μs < μk. C) Initially, the normal force is not perpendicular to the applied force. D) μk < μs. E) μs = μk.A packing crate slides down an inclined ramp at constant velocity. Thus we can deduce that A) a frictional force is acting on it. B) a net downward force is acting on it. C) a net upward force is acting on it. D) it is not acted on by appreciable normal force. E) it is not acted on by appreciable gravitational force.If a car slows down with the wheels rolling, is the frictional force between the tires and the ground kinetic or static? A) kinetic B) static

A block of mass M slides down a frictionless plane inclined at an angle θ with the horizontal. The normal reaction force exerted by the plane on the block is A) Mg. B) Mg sin θ. C) Mg cos θ. D) Mg tan θ. E) zero, since the plane is frictionless.A block of mass M slides down a frictionless plane inclined at an angle θ with the horizontal. The normal reaction force exerted by the plane on the block is directed A) parallel to the plane in the same direction as the movement of the block. B) parallel to the plane in the opposite direction as the movement of the block C) perpendicular to the plane. D) toward the center of the Earth. E) toward the center of mass of the block.A block of mass M slides down a frictionless plane inclined at an angle θ with the horizontal. The gravitational force is directed A) parallel to the plane in the same direction as the movement of the block. B) parallel to the plane in the opposite direction as the movement of the block C) perpendicular to the plane. D) toward the center of the Earth. E) toward the center of mass of the block.An object rests on an inclined surface. If the inclination of the surface is made steeper, what does the normal force on the object do? A) increase B) decrease C) stays the same D) The normal force is zero N. E) Cannot be determined without additional information.

A person is lowering a bucket into a well with a constant speed. The force exerted by the rope on the bucket is A) equal to the bucket’s weight. B) greater than the bucket’s weight. C) less than the bucket’s weight, but not zero N. D) zero N. E) Cannot be determined without additional information.You ride on an elevator that is moving downward with constant speed while standing on a bathroom scale. The reading on the scale is A) equal to your true weight, mg. B) more than your true weight, mg. C) less than your true weight, mg. D) could be more or less than your true weight, mg, depending on the value of the speed.You ride on an elevator that is moving with constant downward acceleration while standing on a bathroom scale. The reading on the scale is A) equal to your true weight, mg. B) less than your true weight, mg. C) more than your true weight, mg. D) could be more or less than your true weight, mg, depending on the magnitude of the.What does the word “normal” mean in the phrase “normal force”? A) the force that is usually exerted by a surface B) the total force exerted by a surface C) the component of the force exerted by a surface parallel to the surface D) the component of the force exerted by a surface perpendicular to the surface E) the force is due to contact between two objects.

A locomotive is pulling a number of identical wagons along a level track and accelerating. Friction is negligible. Starting from the last wagon, the ratio of the forces between adjacent wagons is A) 1:2:3:4 . . . B) 1:2:4:8 . . . C) 1:3:5:7 . . . D) 1:1/2:1/3:1/4 . E) 1:1:1:1 . . .A student uses a plumb bob to verify that the doorjamb in a car is vertical. As the car pulls away from a stop, the student observes that the string now makes an angle θ with the doorjamb. What is the acceleration of the car? A) g sin θ B) g cos θ C) g tan θ D) g θ E) θA ball is thrown up into the air. Ignore air resistance. When it is rising and reaches half of its maximum height, the net force acting on it is A) equal to its weight. B) greater than its weight. C) less than its weight, but not zero N. D) zero N. E) Cannot be determined without additional information.A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictional force that the pole exerts on the fireman. When this force equals the weight of the fireman, what happens? A) The fireman comes to a stop. B) The fireman descends with slower and slower speed. C) The fireman descends with a smaller acceleration. D) The fireman continues to descend, but with constant speed. E) Cannot be determined without additional information

golf club hits a golf ball with a force of 2400 N. The golf ball hits the club with a force A) slightly less than 2400 N. B) exactly 2400 N. C) slightly more than 2400 N. D) close to 0 N. E) Cannot be determined without additional information.A horse pulls a cart with force F. As a result of this force the cart accelerates with constant acceleration. What is the magnitude of the force that the cart exerts on the horse? A) zero Newtons B) equal to the magnitude of F C) less than the magnitude of F D) more than the magnitude of F E) cannot be determined without additional information

Imagine that the metal head of a hammer is loose. In order to get the hammerhead tight again you should A) drop the hammer on its side from some given height. B) drop the hammer with the handle end down. C) drop the hammer with the head end down. D) It makes no difference how you drop the hammer, the head will be tightened. E) It makes no difference how you drop the hammer, the head will not be tightened.You apply the same force to two objects. Object 1 has mass M and object 2 has mass 5M. The acceleration of object 2 is A) ten times that of object 1. B) five times that of object 1. C) the same as that of object 1. D) one-fifth as that of object 1. E) has no relation to that of object 1.A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the car A) the force on the truck is greater then the force on the car. B) the force on the truck is equal to the force on the car. C) the force on the truck is smaller than the force on the car. D) the truck did not slow down during the collision. E) the car did not slow down during the collision.A truck is towing a car whose mass is one quarter that of the truck. The force exerted by the truck on the car is 6000 N. The force exerted by the car on the truck is A) 1500 N. B) 24000 N. C) 3000 N. D) 6000 N. E) 12000 N.

In the absence of an external force, a moving object will A) stop immediately. B) slow down and eventually come to a stop. C) move faster and faster. D) move with constant velocity for a while and then slow to a stop. E) move with constant velocity.An object is moving with constant velocity. Which of the following statements is true? A) A constant force is being applied in the direction of motion. B) A constant force is being applied in the direction opposite of motion. C) There are no forces acting on the object. D) The net force on the object is zero. E) There is no frictional force acting on the object.When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal velocity. This means that A) the acceleration is equal to g. B) the force of air resistance is equal to zero. C) the effect of gravity has died down. D) the effect of gravity increases as he becomes closer to the ground. E) the force of air resistance is equal to the weight of the parachutist.A constant net force acts on an object. Describe the motion of the object. A) constant non-zero velocity. B) constant non-zero acceleration. C) increasing acceleration. D) decreasing acceleration. E) zero acceleration.