The purpose of an airbag is to increase the time it takes your body to come to a stop during an automobile accident. This increased time causes the force of the impact to decrease. 1) True 2) False
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- 10) A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle 0 below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. What is the friction force on the box due to the floor? P. WYou are trying to slide a heavy trunk across a horizontal floor. The mass of the trunk is 85kg, and you need to exert a force of 3.3*10^2 N to make it just begin to move. a)Determine the coefficient of static friction between the floor and the trunk.b)After the trunk starts moving, you continue to push with this force. The trunk reaches a speed of 2.0m/s after 5.0s. Calculate the acceleration of the trunk if the coefficient of kinetic friction between the trunk and the floor is 0.32.A 2.0-N rock slides on a frictionless inclined plane. Which one of the following statements is true concerning the normal force that the plane exerts on the rock? ... A The normal force is less than 2.0 N, but greater than zero newtons. B The normal force increases as the angle of inclination, q, is increased. The normal force is greater than 2.0 N. D The normal force is 2.0 N.
- 2. A man pushes a crate of mass 70kg along a horizontal floor with a constant horizontal force in an easterly direction. Starting from rest, the trunk. reaches a velocity of 1.5 m/s (E) after 3.0s. The coefficiant of Kinetic friction between the crate and the floor is 0.34. Determine the man's horizontal applied force. Be sure to draw a free body diagram fram and indicate positive direction.During a physics inquiry, you place a 0.250kg dynamics cart on a ramp inclined at 25.0 degrees to the horizontal. The cart is initially at rest, before you pull it up the ramp with a force sensor. The force sensor exerts a force on the cart parallel to the ramp. The coefficient of friction is 0.300. Determine the force to pull the cart up the ramp at an acceleration of 1.50 m/s/s. Include a force diagram.MY NOTES ASK YOUR TEACHER A Mercedes-Benz 300SL (m = 1750 kg) is parked on a road that rises 20° above the horizontal. (a) What is the magnitude of the normal force? X N 16.1 8 9. (b) What is the static frictional force that the ground exerts on the tires? 5.86 Additional Materials 6. D eBook Submit Answer ?? TOO 2,197 MacBook Air %23 3 4 2 E RO H. D F 3. 2.
- You are trying to slide a heavy trunk across a horizontal floor. The mass of the trunk is 85 kg, and you need to exert a force of 3.3 x 102 N parallel to the ground to make it just begin to move. a). Determine the coefficient of static friction between the floor and the trunk. After the trunk starts moving, you continue to push with this force. The trunk reaches a speed of 2.0 m/s after 5.0 s. Calculate the coefficient of kinetic friction.A 1800 kgkg car starts from rest and drives around a flat 50-mm-diameter circular track. The forward force provided by the car's drive wheels is a constant 1000 NN . A)What is the magnitude of the car's acceleration at t=13s ? B) What is the direction of the car's acceleration at t=13s? Give the direction as an angle from the r-axis. c) If the car has rubber tires and the track is concrete, at what time does the car begin to slide out of the circle?1. Consider the forces acting on these three changes and list in order of the magnitude of the force starting with the smallest. A --- r B -4 +q +q Find FA Find Fa Find Fe List in order of the magnitude
- 64. A box is at rest on top of a table surface. Which of the following is TRUE? * The net force acting on the box is zero. O The box is in static equilibrium. The normal force balances the weight of the box. O All of these.An automobile is going up a grade of 15 with an initial velocity of 30 m/s. The coefficient of static friction between the tires and the road is 0.7. a) What minimum distance does it take to stop the car? b) What minimum distance would it take to stop the car if it were going down the grade?Côncept Example 9. A 225-kg crate rests on a surface that is inclined em are presented in Multiple- above the horizontal at an angle of 20.0°. A horizontal force (magnitude 535 N and parallel to the ground, not the incline) is required to start the into solving crate moving down the incline. What is the coefficient of static friction s an angle of hetic friction * initial speed between the crate and the incline? 119. The drawing shows a 25.0-kg crate that 球 Is initially at rest. Note that the view is one look- ing down on the top of the crate. Two forces, F, and F, are applied to the crate, and it begins to +y does the box 2- move. The coefficient of kinetic friction =0.350. 55.0 es, a force of 54.0 N F, between the crate and the floor is u = current of the Determine the magnitude and direction (relative Top view of east. When in a direction to the x axis) of the acceleration of the crate. ADN (NG N 88.0 N