3. Am=12.0 kg object is placed on a bathroom scale in an elevator. a. Draw a free body diagram of the object. Label the forces. Determine the apparent weight (the weight that would show in the scale) of the object f. b. The elevator is at rest. c. The elevator is rising at a constant velocity. d. The elevator is accelerating upward at 1.5 m/s/s. e. The elevator is accelerating downward at 1.5 m/s/s.
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- 5. Two 20kg carts are attached to opposite ends of a cable. Each cart is on a different side of an incline as shown. Neglect the mass and friction of the cable and pulley. a. What is the acceleration of the carts? b. If the carts start at rest, and they do not run out of cable or incline, how far will they have traveled in 5 seconds? m₁ = 20 kg/ 12° 9 m₂ = 20 kg 20°The coefficient of kinetic friction is equal to the force of kinetic friction divided by a. the normal force b. the weight of the object c. the mass of the object d. the acceleration of the object Why is static friction more complex in analysis than kinetic friction? a .Because its magnitude and direction can vary b. Because it is invisible c. Because it does not depend on the normal force d. Because it depends on the kinetic friction1.
- 24. A pickup truck with mass 980 kg is initially at rest. The truck accelerates to a speed of 95 km/hr within a distance of 60 meters. What the direction and size of the force that acts on the truck? a. b. If the truck were carrying a load of 200 kg, what new force would be required to achieve the same acceleration?Explain Newton's second Law and solve related problems Given a block which is at rest on a perfectly flat smooth table. You push with your hand horizontally on the block with some force. If the mass of the block = 2.00 kg and the acceleration of the block = 5.00 m/s2 then what is the force on the block from your hand in SI units? a. 2.50 N b. 0.100 N c. 0.400 N d. 10.0 N e. zeroYou push a lawnmower (mass=15kg) across the lawn at constant speed. To do so, you must excert 200 N of force. The handle makes a 35° angle with the horizontal. A. Draw the force diagram B. What is the x-component of the force you apply? C. How does it compare to the frictional force which opposes your effort? Explain. D. If the frictional force is reduced to 100 N, determine the acceleration of the lawnmower.
- Two objects accelerate at 1 m/s2. How do the applied forces compare? A. They are different B. They are the same C. I can't tell without the mass For a given object, which force due to friction is typically larger? A. They are different B. Kinetic friction C. Static friction D. Now way to tell without knowing the massa. An object that is free-falling is acted upon by the force of gravity alone. b. A falling skydiver which has reached terminal velocity is considered to be in a state offree fall. c. A ball is thrown upwards and is rising towards its peak. As it rises upwards, it is NOT considered to be in a state offree fall d. An object in free fall experiences an acceleration which is independent of the mass of the object. e. A ball is thrown upwards, rises to its peak and eventually falls back to the original height. As the ball rises, its acceleration is upwards; as it falls, its acceleration is downwards. f. A ball is thrown upwards, rises to its peak and eventually falls back to the original height. The speed at which it is launched equals the speed at which it lands. (Assume negligible air resistance.) g. A very massive object will free fall at the same rate of acceleration as a less massive object.Three boxes in contact slide side-by-side on a smooth, friction-less, horizontal floor. Their masses are 5.0-kg, 3.0-kg, and 2.0-kg, with the 3.0-kg box in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes. A. Draw the free-body diagrams for each of the boxes. B. What magnitude force does the 3.0-kg box exert on the 5.0-kg box? C. What magnitude force does the 3.0-kg box exert on the 2.0-kg box?
- A restaurant manager pushes a box of melons horizontally with a force of magnitude 150 N. The box moves along the floor with a constant acceleration in the same direction as the applied force. Which statement is more precise regarding the magnitude of the kinetic friction force acting on the crate? a. It is greater than 150 N. b. It is equal to 150 N. c. The friction force must be zero. d. The kinetic friction force is constantly decreasing. e. It is less than 150N.A person pushes a box with a small constant force to move the box along the floor at a constant speed in a straight-line path. Which of the following statements is true? a. The net force on the box is zero. b. There are no other forces on the box (besides the person’s push.) c. The net force on the box must be greater than zero to keep the box moving. d. The box has an acceleration that is not zero. e. [Both (c) and (d) are true.]A 75 kg parent and a 22 kg child meet at the center of an ice rink. They place their hands together and push hard enough to slide apart. a. Is the force experienced by the child more than, less than, or the same force experienced by the parent? b. Is the acceleration of the child more than, less than, or the same acceleration as the parent? c. If the acceleration of the child is 2.3 m/s2 in magnitude, what is the magnitude of the force of the parent's push on the child?