Quarter 1 Test Review 1. What is motion? 2. A table holds a 50N box. With what force does the table push on the box? 3. A 1.0 kg box and a 2.0 kg box are dropped from the same point above the ground. What is the acceleration of each? 4. A girl pushes an 10.0kg box across the floor. When she lets go of it the box slows down because of friction at 4.0m/s2. What is the coefficient of friction between the box and the floor? 5. A rope pulls a 25.0N bucket of water up at a constant acceleration of 2.00m/s² for 3.00s. What is the tension in the rope? 6. If an object has only 1 force acting on it, can its acceleration be 0m/s2? 7. Use the velocity vs. time graph shown to the right to find the acceleration of the object at (when) a) t= 7.5s and b) t=11s . 8a. Draw both the position vs. time graph and velocity vs. time graphs for an object moving with a (positive) constant velocity. b. Draw them again if the object had a (positive) constant acceleration. 9a. Draw a sketch of the velocity vs. time graph of a feather being dropped on the moon. b) A skydiver jumps from an airplane that is flying horizontally. Assuming down is the positive direction, draw a sketch of the velocity vs. time graph for the skydiver’s vertical velocity as he falls, including the effects of air resistance. 10. A rock is thrown at an angle of 14.0° above horizontal from the top of a cliff with an initial speed of 5.00 m/s. If the rock takes 2.00s to land on the ground below the cliff, a. what is the height of the cliff? b. How far does the rock travel horizontally? 11. Convert 421cm/min to m/s. 12a. On the earth, what is the ratio of an object’s weight to its mass? (Hint: The “ratio of x to y” = x/y.) b. Would the ratio change if the object were taken to the moon (yes or no)? 13. A football is kicked hit from ground level with a speed of “v” at an angle of 35° above horizontal and lands back at ground level. The instant before the football touches the ground, what is it’s a) horizontal speed and b) what is its vertical speed? 14. A 5kg box moves at 3m/s and a 3kg box moves at 5m/s. a) Which has more inertia? b) If they run into each other, which will experience the greater force? c) If they run into each other, which will experience the greater acceleration? 15. An rock is thrown horizontally from 10.0m above the ground level. The rock travels a horizontal distance of 20.0m before it lands. a. How much time passes before the rock hits the ground? b. How fast was the rock thrown horizontally? 16. How long would it take a ruler, starting from rest, to fall a distance of .2634m? Quarter 1 Test Review 1. What is motion? 2. A table holds a 50N box. With what force does the table push on the box? 3. A 1.0 kg box and a 2.0 kg box are dropped from the same point above the ground. What is the acceleration of each? 4. A girl pushes an 10.0kg box across the floor. When she lets go of it the box slows down because of friction at 4.0m/s2. What is the coefficient of friction between the box and the floor? 5. A rope pulls a 25.0N bucket of water up at a constant acceleration of 2.00m/s² for 3.00s. What is the tension in the rope? 6. If an object has only 1 force acting on it, can its acceleration be 0m/s2? 7. Use the velocity vs. time graph shown to the right to find the acceleration of the object at (when) a) t= 7.5s and b) t=11s . 8a. Draw both the position vs. time graph and velocity vs. time graphs for an object moving with a (positive) constant velocity. b. Draw them again if the object had a (positive) constant acceleration. 9a. Draw a sketch of the velocity vs. time graph of a feather being dropped on the moon. b) A skydiver jumps from an airplane that is flying horizontally. Assuming down is the positive direction, draw a sketch of the velocity vs. time graph for the skydiver’s vertical velocity as he falls, including the effects of air resistance. 10. A rock is thrown at an angle of 14.0° above horizontal from the top of a cliff with an initial speed of 5.00 m/s. If the rock takes 2.00s to land on the ground below the cliff, a. what is the height of the cliff? b. How far does the rock travel horizontally? 11. Convert 421cm/min to m/s. 12a. On the earth, what is the ratio of an object’s weight to its mass? (Hint: The “ratio of x to y” = x/y.) b. Would the ratio change if the object were taken to the moon (yes or no)? 13. A football is kicked hit from ground level with a speed of “v” at an angle of 35° above horizontal and lands back at ground level. The instant before the football touches the ground, what is it’s a) horizontal speed and b) what is its vertical speed? 14. A 5kg box moves at 3m/s and a 3kg box moves at 5m/s. a) Which has more inertia? b) If they run into each other, which will experience the greater force? c) If they run into each other, which will experience the greater acceleration? 15. An rock is thrown horizontally from 10.0m above the ground level. The rock travels a horizontal distance of 20.0m before it lands. a. How much time passes before the rock hits the ground? b. How fast was the rock thrown horizontally? 16. How long would it take a ruler, starting from rest, to fall a distance of .2634m?