Test 6 Review PDF

Speed vs Velocity The coordinate system is set with right as the + direction for this activity. 1. Sid the Sloth is avoiding a boulder rolling down the mountain. He runs rightward 80 m and runs leftwards another 162 m. The total time spent running was 3 minutes. a. What is Sid’s average velocity (i...

Speed vs Velocity The coordinate system is set with right as the + direction for this activity. 1. Sid the Sloth is avoiding a boulder rolling down the mountain. He runs rightward 80 m and runs leftwards another 162 m. The total time spent running was 3 minutes. a. What is Sid’s average velocity (in m/s)? b. What is Sid’s average speed (in m/s)? 2. Jonah walks left 25 m towards his truck. He realizes that he left his coffee at the house and goes back to retrieve it. His total travel time is 240 s. a. What is his average velocity over the 240 seconds? b. What is his average speed over the 240 seconds? 3. Armani walks right 30 m to his car. He then drives another 76 m for a total time of 145 seconds. a. What is Armani’s average velocity over the 145 seconds? b. What is Armani’s average speed over the 145 seconds? Acceleration 4. A runner covers the last straight stretch of a race in 4 s. During that time, he speeds up from 5 m/s to 9 m/s. What is the runner’s acceleration in this part of the race? 5. You are traveling in a car that is moving at a velocity of 20 m/s. Suddenly, a car 10 meters in front of you slams on the brakes. At that moment, you also slam on your brakes and slow to 5 m/s. Calculate the acceleration if it took 2 seconds to slow your car down. 6. A ball is dropped from the top of a building. After 2 seconds, the velocity is measured to be 19.6 m/s. Calculate the acceleration for the dropped ball. Momentum 7. A beach ball is rolling in a straight line toward you at a speed of 0.78m/sec. Its momentum is 0.22 kg·m/sec. What is the mass of the beach ball? 8. A 6,000-kilogram truck travels in a straight line at 13.0 m/sec. What is its momentum? 9. A 1,461-kilogram car is also traveling in a straight line. Its momentum is equal to that of the truck in the previous question. What is the velocity of the car? Weight 10. A physical science test book has a mass of 2.2 kg... a. What is the weight on the Earth? b. What is the weight on Mars (g = 3.7 m/s2 ) c. If the textbook weighs 19.6 newtons on Venus, What is the strength of gravity on Venus? Force 11. You give a shopping cart a shove down the aisle. The cart is full of groceries and has a mass of 18 kg. The cart accelerates at a rate of 3 m/s2. How much force did you exert on the cart? 12. The wind pushes a paper cup along the sand at a beach. The cup accelerates at a rate of 25 m/s2. The wind exerts a 5N force on the cup? How much does this cup weigh? 13. You push a friend sitting on a swing with a force of 10 N. She has a mass of 50 kg. What is her acceleration? Write the following formulas: 14. Speed 15. Velocity 16. Acceleration 17. Momentum 18. Weight 19. Force