ForcesReview

Directions: Answer on your own paper. Remember FVWAU. No Work, No Credit, No Kidding! Answer to the nearest hundredths.

  1. A. What is the first law of motion? Give an example.

B. What is the second law of motion? Give an example.

C. What is the third law of motion? Give an example.

  1. A reindeer has a weight of 1715 N. What is its mass? Ans: 175 kg
  1. A bucket has a mass of 68400g. What is its weight? Ans: 670.32 N
  1. Boxer A has a mass of 85 kg. He hits Boxer B with a force of 75N. Boxer B has a mass of 72kg. With what force did Boxer B hit boxer A? Ans: 75 N
  1. A ball at rest has a weight of 210N. If a seal uses its nose to push it horizontally across the floor with a force of 18N, what is the acceleration of the ball? What is its velocity after 4 seconds? Ans: 0.84m/s2, 3.36m/s
  1. A net force of 289 N is exerted on a bulk of scrap metal causing it to accelerate at a rate of 0.25 m/s2. Determine the mass of the scrap metal. Ans: 1156 kg
  1. A box with a mass of 24 kg is pushed across the floor at a constant speed by a force of 16.2 N. What is the force of friction on the book? Ans: 16.2 N
  1. An old stereo system has a mass of 32 kg and is sitting motionless on tile floor. The coefficient of friction between the base of the stereo and the floor is 0.21. What is the magnitude of the force of friction? Ans: 65.86 N
  1. A crate of old computers has a weight of 425N. It is pushed and accelerates horizontally across the ground withan applied force of 167.15 N. What is the Net force acting on the crate if µ = 0.35?

Ans: 18.4 N

  1. Mrs. Sauder has to rearrange the classroom. She places Connor on a large sheet of cardboard and drags him out to the hall way. Her arms make an angle of 37° with the floor and she pulls with a force of 52.5N. If she pulls at a constant velocity, what is the force friction on the cardboard? Ans: Hint-this is a concept question! 41.93N
  1. A rope is used to drag a large crate of licorice (42kg) across the floor at a constant velocity. The rope makes an angle of 27 o with the floor. The force applied to the rope is 163 N. What is the coefficient of friction between the crate and the floor? Ans: 0.43
  1. Tori has a messy room! She piles all her stuffed animals into a box. The box has a mass of 128 kg. She pulls into motion by a rope across the carpet. (μ = 0.264) with a force of 512 N at 35.9° above the horizontal. How far does the crate travel in 8 seconds? Ans: 40.64 m
  1. Johni uses a rope is used to lift a 68.4-kg barrel of monkeys from the bottom of a 20.7-m deep well that is filled with alligators. What is the Force of tension on the rope if she lifts the barrel at a constant velocity? Ans: 670.32N
  1. Garrett hangs from the chin up bar with both arms. What is the Force of tension on each of his arms if he weighs 705.6N? Ans: 352.8N
  1. Zoe carries a dinner tray across the room for her Great Dane. She supports the tray with two hands. If the mass of the dinner tray and meal combined are 17 kg, what is the force of tension in each of her arms? Ans: 83.3N