Honors Physics Semester Exam Review
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1 Honors Physics Semester Exam Review name: Constant Speed 1. A cat is running at its top speed of 3 m/s as it sees the spot of a laser on the floor that is 4 feet away. How long does it take it to reach the laser? ( 1 m = 3.28 ft) 2. Use the graph to the right to answer the questions below: a. What is the speed of the object at A? b. What is the speed of the object at B? Acceleration Example Problems: 3. You are at the top of a sledding hill. You start from rest and speed up as you go down the hill! You time that it takes you 4.3 seconds to get down to the bottom of the 30 m hill. What is your rate of acceleration? 4. Determine the acceleration and total distance traveled based on the graph below:
2 5. A Lamborghini has an acceleration rate of 8.93 m/s 2! How long does it take the car to go from 20 miles/hour to 70 miles/hour? Also, how far would it travel in that time? (1 m/s = 2.24 mph) Topic 3: Graphs Describe what is happening in each of the graphs below. Then sketch the missing graph. Description of motion x-t graph v-t graph
3 A car starts from rest and accelerates to a certain speed. It then travels at that speed for a while Forces Vocab word Definition Units mass Normal force Force of gravity Force of friction µ
4 6. You push a 100 kg couch across a carpeted floor. You push horizontally with N of force. The couch accelerates as you push it, gaining 1.35 m/s each second, although you re only pushing it for about 3 seconds. a. How much force is friction exerting on the couch? b. Assuming it started from rest, what speed does it end up with? c. What is the coefficient of friction between the carpet and the couch? 7. You pull up on a 3 kg bag of groceries with a force of 35 N. What is the acceleration of the bag? A force diagram may help. 8. Your parents just bought a new fridge. The fridge weighs kg. They want you to move it from the door to the kitchen. The fridge starts from rest and accelerates at a rate of 0.8 m/s 2. If friction applies a force of 135 N, how much horizontal force did you push with?
5 9. You are pulling your dog across the floor. He has a mass of kg and is sliding at a constant rate as you pull with a force of 33 N. What is the coefficient of friction between the dog and the floor? 10. A tabletop is now at an angle and a greasy turkey begins to accelerate down the table. It s a 15 lb turkey and the tabletop is tilted at an angle of about 40 degrees. What acceleration will the turkey slide at if you assume that the turkey is greasy, and therefore will NOT experience any friction? (1 kg = 2.2 lbs) 11. If there is a net force on an object, describe what the object is doing. 12. A ball attached to a string is lowered at a constant speed. Which of the following is true? A) F T < F g B) F T > F g C) F T = F g
6 13. A ball attached to a string is accelerating upwards. Which of the following is true? A) F T < F g B) F T > F g C) F T = F g Projectiles/ Free Fall 14. How long does it take an object to rise to the top of its path if it is thrown up at 18 m/s. 15. You throw an object down at 18 m/s. How far does it travel after 1 second? 16. Which velocity, horizontal or vertical, remains constant for a golf ball in flight? 17. You launch a hotwheels car off of the edge of your dining room table at home! It flew off completely horizontally. The table is about 85 cm tall and the hotwheels car landed 140 cm from the base of the table. What speed did the car leave the table with? (1m = 100 cm)
7 18. A cannonball is launched with an initial speed of 80 m/s horizontally from the edge of a cliff. It lands 65 meters from the base of the cliff. How tall is the cliff? 19. A golf ball hit at 60 m/s with an angle of 42 above the horizontal. How much time will it take to hit the ground if it lands at the same height from which it was hit? Determine its maximum height as well. 20. Two rocks ae dropped from the same height at the same time. Rock A is heavier. Which one hits the ground first? Assume there is no air resistance. 21. One bullet is launched straight forwards while a marble is dropped straight down from the same height at the same time. Assuming there is no air resistance, which one hits the ground first?
B) 286 m C) 325 m D) 367 m Answer: B
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