Force and Kg Astronaut Stands

Name_______________________________________Period______Date_________________________

Unit 3 and Unit 4 Quiz 1. How is weight calculated? __mxg_________
Would your weight be the same on earth as it is on the moon? __no____ 2. What units do we measure mass in? ____kg_________
Would your mass be the same on earth as it is on the moon? __no______ 3.

Label the forces shown in the free-body diagram above. 5800N friction, 775N applied force, 14700 N gravity, 13690 N normal force 4. A late traveler rushes to catch a plane, pulling a suitcase with a force directed 30.0º above the horizontal. If the horizontal component of the force on the suitcase is 60.6 N, what is the force exerted on the handle? 121.2 m

5. A wagon with a weight of 300.0 N is accelerated across a level surface at 0.50 m/s2. What net force acts on the wagon? (g = 9.81 m/s2) 15.29 m/s2

6. A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 8.0 x 101 N is being applied to the sled rope at an angle of 53º to the ground, what is the force of friction between the sled and the snow? -48.15 N

7. What is the mass of a Chuck Norris that weighs 200 N? 20.39 kg 330
8. A 15-N force and a 45-N force act on an object in opposite directions. What is the net force on the object? 30 N

9. A 400,000 kg airplane in takeoff uses a thrust force of 160,000 N. What is the acceleration of the plane during takeoff? .4 m/s

10. If two teams playing tug-of-war pull on a rope with equal but opposite forces, what is the net force on the rope? 0N

11. A girl whose weight is 600 N hangs from the middle of a bar supported by two vertical strands of rope. What is the tension in each strand? 300 N

12. A girl pulls on a 10-kg wagon with a constant force of 20 N. What is the wagon's acceleration? .5 m/s2

13. You pull horizontally on a 50-kg crate with a force of 450 N and the friction force on the crate is 250 N. The acceleration of the crate is 4 m/s2

14. A box weighing 1.0 x102 N is held in place on a frictionless 20.0° slope by a rope attached to a stake at the top. The rope is parallel to the slope. What is the normal force of the slope acting on the sled? 34.20 N

15. When an object reaches terminal velocity its acceleration is __0 m/s2__________ 16. A 250.0 kg fireman slides down a fire pole at constant velocity. What is the friction force between the fireman and the pole?( g=10 m/s2) 2500 N

17. The centripetal force always acts in what direction? ______inward_________ 18. A space station has a radius of 1.25 km. If an 80 kg astronaut stands on the outermost level of the space station, what tangential velocity must he have in order for gravity on Earth to be simulated? .088 m/s

19. A space station has a radius of 1.25 km. If an 80 kg astronaut stands on the outer level of the space station, what centripetal force will he experience if the acceleration at the edge of the space station is 9.8 m/s2? 784 N

20. A 1.0 kg bucket of water being swung in a circle from a 0.75 m long rope at a speed of 2.75 m/s. What is the centripetal force acting on this bucket? 10.08 N

21. What is the gravitational force between two asteroids, one with a mass of 8000 kg and the other with a mass of 7550 kg that are separated from each other by a distance of 82 m? (G = 6.67 x 10-11 Nm2/kg2) 5.99 x 10 -7 N

22. A 5.2 kg bunny stands at the top of a 2.4 m high hill. What is its potential energy? 122.4288 J

23. A 5.2 kg bunny slides down a 2.4 m high hill. What is its velocity at the bottom?
6.86 m/s

24. A 4.5 N baby chick runs around in a circle with a velocity of 1.15 m/s. How much kinetic energy does the chick have? .303 J How much momentum does the chick have? .528 kg m/s

25. A 0.25 kg egg is picked up and placed into a basket that is 0.85 m off the ground in 1.1 s. How much work was done on the egg? 2.08 J

26. A 0.25 kg egg is picked up and placed into a basket that is 0.85 m off the ground in 1.1 s. How much power was required for this action? 1.90 W

27. A piece of chocolate has 15 J of kinetic energy when it is thrown to a student with a speed of 1.7 m/s. What is the mass of the chocolate? 10.38 kg

28. If a rabbit uses a force of 2.9 N to push a 0.75 kg egg for a distance of 3.0 m, what is the work done to the egg? What is the change in kinetic energy of the egg? (hint: use the work energy theorem) 8.7 J change in KE is 8.7 J

29. A girl pulls on the leash of her pet chicken with a force of 2.5 N at an angle of 30º, causing the chicken to move a horizontal distance of 3.1 m. How much work was done to the poor chicken? 6.71 J

30. A 3.0 kg chunk of putty moving at 15.0 m/s collides with and sticks to a 5.0 kg bowling ball that initially at rest. What will the momentum of the bowling ball with its putty passenger be after the collision? 45 kg m/s

31. An 80 kg free-floating astronaut fires 0.12 kg of gas at a speed of 37 m/s from her propulsion pistol. What is the astronaut’s recoil speed? .055 m/s

32. A 7.8 kg fish swims toward and swallows a 3.0 kg fish that is at rest. If the larger fish