5) A student raises their 15 kg backpack from 8) A 45 kg chimpanzee on a skateboard the floor at a constant velocity of 5.0 m/s. accelerates from rest to 13.0 m/s over a How much force must the student apply? distance of 8.0 m. A force of friction of 65 N acts on the board. What force must the chimp apply? 6) A physics teacher attaches a 4.0 kg brick to a light string (boy do you need a new hobby!) and pulls straight up on it. The brick 9) A 1350 kg crash test car strikes a cement accelerates upwards at 3.2 m/s2. How much wall at 24.0 m/s and bounces back at 8.0 m/s. force did the teacher apply to the brick? a. If it is in contact with the wall for 0.90 s, what force did the wall exert on the car? b. If the same car had no crumple zones then 7) A 75kg skydiver falls at terminal velocity it would only be in contact with the wall for (220 km/h) before pulling the chute. If she 0.080 s. What force would the wall exert in slows to 25 km/h in 3.8 s, determine the this case? average force of air friction that acts on her during her deceleration.
5) A student raises their 15 kg backpack from the floor at a constant velocity of 5.0 m/s. How much force must the student apply? 6) A physics teacher attaches a 4.0 kg brick to a light string (boy do you need a new hobby!) and pulls straight up on it. The brick accelerates upwards at 3.2 m/s2. How much force did the teacher apply to the brick? 7) A 75kg skydiver falls at terminal velocity (220 km/h) before pulling the chute. If she slows to 25 km/h in 3.8 s, determine the average force of air friction that acts on her during her deceleration. 8) A 45 kg chimpanzee on a skateboard accelerates from rest to 13.0 m/s over a distance of 8.0 m. A force of friction of 65 N acts on the board. What force must the chimp apply? 9) A 1350 kg crash test car strikes a cement wall at 24.0 m/s and bounces back at 8.0 m/s. a. If it is in contact with the wall for 0.90 s, what force did the wall exert on the car? b. If the same car had no crumple zones then it would only be in contact with the wall for 0.080 s. What force would the wall exert in this case?
worksheet_-_5_-_newtons_2nd_law_part_2.docx