Under Oregon Law, all passengers in a moving vehicle must wear a seatbelt. Using Newton's First Law, explain why a seatbelt is necessary to protect passengers in the event of a car crash.
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- A physics major is cooking breakfast when he notices that the frictional force between his steel spatula and his Teflon frying pan is only 0.200 N. Knowing the coefficient of kinetic friction between the two materials, he quickly calculates the normal force. What is it?A friend has given a special gift, a box of mass 10.0 Kg with a mystery surprise inside. The box is resting on the smooth (frictionless) horizontal surface of a table. a-)determine the weight of the box and the normal force exerted on it by the table. b-)now your friend pushes down on the box with a force of 40.0N, determine the normal force. c-)If your friend pulls upward on the box with a force of 40.0N, what now is the normal force?Returning from a rainy hike in the woods, you find that your car is now stuck in mud. Youdecide to free your car using your knowledge of physics and tie a rope to the car and then to a tree trunk about 20.0 meters from the car. You stand in the middle of the rope and push as hard as you can (exerting a force of 1,500. Newtons) on the rope in the direction perpendicular to the rope. This causes the rope to displace by 50.0 centimeters in the direction of your push. How hard is the rope pulling on your car?
- A) Your(660N) physics teacher skis down an incline of 12 degrees to the right. The coefficient of kinetic friction between the skis and the snow is 0.01. Draw a free-body diagram of your physics teacher. B) Draw a free-body diagram with all forces parallel to an axis. Use the axis y' pointing up perpendicular to the slope and x' pointing down the slope. You may have to break up force vectors into their components to accomplish this. C) What is the normal force? (Magnitude and Direction) D) What is the friction force? (Magnitude and Direction) E) What is the net force? (Magnitude and Direction) F) What is their acceleration? (Magnitude and Direction) G) If she starts from rest, how far does she go in 10.0 seconds?Hannah and Andreas housemates, David and Stephanie, disagree with the move and want to prevent the relocation. Their combined force FDs must be equal and opposite to that of FHA. What is the magnitude in newtons of the force FDS that will prevent the relocation?A women holds a book by placing it placing it between her hands such that she that she presses at right angles to the front and back covers. This book has a mass of m = 0.55 kg and the coefficient of static friction between her hand and the book is 0.67 What is the minimum force she must apply with each of her hands, F min in Newton’s to keep the book from falling ?
- Consider Figure P2-10 on P. 37 of your textbook showing two forces applied to a truss. Assume the 400 N acts along the + x-axis. a) Find the magnitude of the resultant force acting at point B. b) What is the angle © between the resultant force and the + x-axis?Using focused laser light, optical tweezers can apply a force of about 10 pN to a 1.0 micrometer diameter polystyrene bead, which has a density about equal to that of water: a volume of 1.0 cm3 has a mass of about 1.0 g. Estimate the bead’s acceleration in g’s.A small car collides with a large truck. (a) Isthe magnitude of the force experienced by the car greater than, lessthan, or equal to the magnitude of the force experienced by thetruck? (b) Choose the best explanation from among the following:I. Action-reaction forces always have equal magnitude.II. The truck has more mass, and hence the force exerted on itis greater.III. The massive truck exerts a greater force on the lightweight car.
- Fy m +x P On the left a mass, 17.9 kg, is at rest. Force Pis acting on the mass in the (Fx) direction as shown. The coefficient of static friction between the mass and the surface is μ = 0.855. The coefficient of kinetic friction between the mass and the surface is µ = 0.565. What is the greatest force P that can be applied and the mass will remain at rest?In a TV commercial pickup truck B of mass mB lifts large crate A of mass mA toawrd the top of a cliff by means of a cable and a frictionless pulley. The truck uses constant thrust force F to do the job and accerates forward starting from rest, There are no friction forces except the thrust force F. a) Determine a symbolic formula for the magnitude of the acceration experienced by the crate. The final formula should not include the unknown tension force. b) explain whether the cable tension must be greater than, equal to, or less than the crate weight. c) for mass mA= 1500 kg, mb=2800 kg, and F=18,000N, how far will the crate rise in the first 3.5 s of motion?A 15.0-lb block rests on the floor. Answer the ff. questions. Give its free body diagram (a) What force does the floor exert on the block? (b) A rope is tied to the block and is run vertically over a pulley. The other end is attached to a free-hanging 10.0-lb object. What now is the force exerted by the floor on the 15.0-lb block? (c) If the 10.0-lb object in part (b) is replaced with a 20.0-lb object, what is the force exerted by the floor on the 15.0-lb block?