Chapter 5: Q1 P (page 139)
A woman weighs 120 lb. Determine (a) her weight in newtons and (b) her mass in kilograms.
(a) The weight of woman in newton is .
(b) The weight of woman in kilogram is .
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Question: If an object is in equilibrium, which of the following statements is not true? (a) The speed of the object remains constant. (b) The acceleration of the object is zero. (c) The net force acting on the object is zero. (d) The object must be at rest. (e) There are at least two forces acting on the object.
Question:A toy rocket engine is securely fastened to a large puck that can glide with negligible friction over a horizontal surface, taken as the xy plane. The puck has a velocity of at one instant. Eight seconds later, its velocity is . Assuming the rocket engine exerts a constant horizontal force, find (a) the components of the force and (b) its magnitude.
An athlete grips a light rope that passes over a low friction pulley attached to the ceiling of a gym. A sack of sand precisely equal in weight to the athlete is tied to the other end of the rope. Both the sand and the athlete are initially at rest. The athlete climbs the rope, sometimes speeding up and showing down as he does so. What happens to the sack of sand? Explain.
A car is moving forward slowly and is spending up. A student claims that “the car’s engine exerts a force on itself” or that “the car’s engine exerts a force on the car.”
(a) Argue that this idea cannot be accurate and that friction exerted by the road is the propulsive force on the car. Make your evidence and reasoning as persuasive as possible.
(b) Is it static or kinetic friction?
Suggestion: Consider light gravel. Consider a sharp print of the tire tread on an asphalt road, obtained by coating the thread with dust.
Question: A large crate of mass m is place on the flatbed of a truck but not tied down. As the truck accelerates forward with acceleration a, the crate remains at rest relative to the truck. What force causes the crate to accelerate? (a) the normal force (b) the gravitational force (c) the friction force (d) the ma force exerted by the crate (e) No force is required.
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