| A | B |
|---|
| What force is necessary to give a 0.80-kg air track glider a horizontal acceleration of 1.5 m/s^2? | 1.2 N |
| A prospector pushes a 2030-kg cart with a constant horizontal force of 700 N for 5 s. If the cart starts from rest, how far will it go during the 5 s that the force is applied? | 4.31 m |
| A body of mass m resting on a frictionless surface is given a horizontal acceleration of 4.5 m/s^2 by a force of 8.7 N. What is the mass of the body? What is the weight of the body? | 1.93 kg; 18.95 N |
| A 4.0-kg object is moving across a frictionless surface with a constant velocity of 2 m/s. What horizontal force is necessary to maintain this state of motion? | 0 N |
| An object is accelerating at 2 m/s^2. If the net force is tripled and the mass is doubled, then what is the new acceleration? | 3 m/s^2 |
| Three vectors are acting on a 3.0-kg object. If the forces are 4 N at 53˚ north of east, 6 N at 45˚ north of west, and 2 N at 60˚ south of west, determine the magnitude and direction of the object's rate of acceleration. | 2.13 m/s^2 at 63.56 degrees N of W |
| An 80-kg man stands in an elevator. What force does he exert under the following conditions? a) The elevator remains stationary. b) The elevator accelerates upward at 2 m/s^2. c) The elevator rises with a constant velocity of 4 m/s. d) While going up, the elevator decelerates at 1.5 m/s^2. e) The elevator goes down with constant velocity of 7 m/s. | 784 N; 944 N; 784 N; 664 N; 784 N |
| A 10-kg lead brick rests on a wooden table. If a force of 46 N is required to slide the brick across the table at constant speed, find the coefficient of friction between the table and the lead brick. | 0.47 |
| A force of 40 N accelerates a 5-kg block at 6 m/s^2 along a horizontal surface. Find the frictional force and coefficient of friction. | 10 N; 0.20 |
| A baseball is accelerated upward at a rate of 2.8 m/s^2. Find the upward force acting on the ball if the weight of the ball is 34.3 N. | 44.1 N |
| An elevator of mass 450 kg is accelerated upward. If the tension in the cable that supports the elevator is 6200 N, determine the maximum acceleration of the elevator. | ??? |
| A child of mass 75 kg is climbing upward on a rope. If the rope can support a maximum tension of 900 N, determine the the maximum acceleration with which the child can climb the rope. | ??? |
| A car, mass 1225 kg, traveling at 105 km/h, slows to a stop in 53 m. What is the size of the force that acted on the car? | ??? |
| You're riding a skateboard when all of a sudden you hit a curb. According to Newton's first law of motion, what will happen to you? | ??? |
| A bullet of mass 20 g strikes a fixed block of wood at a speed of 320 m/s. The bullet embeds itself in the block of wood, penetrating to a depth of 6.0 cm. Calculate the average net force acting on the bullet while it is being brought to rest. | ??? |
| According a simplified model of a mammalian heart, at each pulse, approximately 20 g of blood is accelerated from 0.25 m/s to 0.35 m/s during a period of 0.10 s. What is the magnitude of the force exerted by the heart muscle? | ??? |
| Consider the following examples. The action force is stated; determine the reaction force. a) An athlete pushes a weightlifting bar upwards. b) A balloon wall pushes compressed air inwards. | ??? |
| A 75-kg petty thief wants to escape from a third-story jail window. Unfortunately, a makeshift rope made of sheets tied together can support a mass of only 58 kg. Find the acceleration the thief must have in order to safely make it down the rope. | ??? |
| An elevator (mass 4850 kg) is to be designed so that the maximum acceleration is 0.0600 g's. What is the maximum force the motor should exert on the supporting cable? | ??? |
| A high jumper, falling at 4.0 m/s, lands on a foam pit and comes to rest, compressing the pit 0.4 m. If the pit is able to exert an average force of 1200 N on the high jumper in breaking the fall, what is the jumper's mass? | ??? |
| On planet X, a 50-kg barbell can be lifted by exerting a force of only 180 N. What is the acceleration of gravity on Planet X? If the same barbell is lifted on Earth, what minimal force is needed? | ??? |
| What type of relationship exists between the force of gravity on an object and its mass? | ??? |
| A horizontal force of 5 N accelerates a 4-kg mass from rest at a rate of 0.5 m/s^2 in the positive direction. What frictional force acts on the 4-kg mass? | ??? |
| On planet Gamma, a 4-kg mass experiences a gravitational force of 24 N. What is the acceleration due to gravity on planet Gamma? | ??? |
| Two forces, one a frictional force of 5 N and the other an applied force of 10 N, act on a 2-kg object. What is the acceleration of the object? | ??? |
| What type of relationship exists between the acceleration of an object and its mass if the force is held constant? | ??? |
