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One Hundred and Fifty Questions 1. What two entities comprise a vector?-a vector is comprised of direction and magnitude. 2. What do you do with any vector that is not on either the x or y axis?-break it up into x and y components using trig, add up the components. 3. How are velocity and speed different?-velocity has a direction while speed does not. 4. What is the slope of the distance time graph? - Delta d/delta t. or distance over time. Rise over run. 5. What is acceleration?-increase in the rate of speed of an object or the rate of change of velocity per unit of time. 6. What is the area under the velocity time graph?-the displacement during the stated time interval. 7. What is the slope of the velocity time graph? The level of acceleration. 8. What is the y intercept of the velocity time graph?-the initial velocity or 0m/s. 9. What is the area under the acceleration time graph? - The speed. 10. What is the horizontal acceleration of projectiles? - The horizontal acceleration is zero because there is a constant horizontal velocity. 11. What dimension controls time in falling body and projectile motion problems? - The vertical dimension. 12. How many puppies are needed to fill an Olympic size pool? - None, no dogs allowed in the pool. 13. What equation describes the distance that a dropped object falls t seconds after it started moving?- x=(1/2)at^2 14. What equation describes the distance that a horizontally launched projectile falls t seconds after it started moving?-x=(1/2)at^2 15. What equation describes the speed of a dropped object t seconds after it started moving?-V=Vo+at 16. What equation describes the speed in the x direction of a projectile t seconds after it started moving?-Vx=(Vxo)t 17. What equation describes the speed in the y direction of a projectile t seconds after it started moving?-Vy=Vyo+gt 18. E
D
C
B
A
Fig 1
E
D
C
B
A
Fig 1
A projectile follows the path in Fig. 1.
At what points does it have the same speed? 19. A projectile follows the path in Fig. 1.
At what point is its horizontal speed the greatest? Point C 20. A projectile follows the path in Fig. 1.
What is the direction of acceleration at points A, B, C, D, and E? (Zero, up, down, right, left?) Point A: up Point B: Point C: down Point D:down Point E: zero 21. A projectile follows the path in Fig. 1. What is the direction of the vertical speed at point C? 22. What is implied when an object is not accelerating in the x direction?- the body is moving at a constant velocity 23. What is implied when an object is not accelerating in the y direction?- g=0 so h=(Vyo)t 24. When is sum of force (net force) zero, and when is it non-zero?-when a body is moving at a constant velocity or not moving at all. And non-zero when a body’s speed is changing. 25. What force is always present, and what is its equation?-weight. W=mg 26. How is sum of force (net force) depicted in a FBD?- it is an arrow that does not touch the body. 27. When is a normal force present, what is its direction?- when the body rests on a surface. 28. What is the component of Fg down a slope?-------------------------- 29. What is the general equation for motion down a slope and how does it change if the object is going up the slope?- x=Vo+((1/2)g)sin(angle)t^2 30. In circular motion, how is tangential velocity calculated?-2(pi)R/T circumference over period 31. What is centripetal acceleration and force?- the acceleration of an object in circular motion towards the center of rotation, and the radial force needed to create this acceleration is centripetal force. 32. Fig 2
C
B
A
Fig 2
C
B
A
What is the direction of acceleration of the object, in Fig. 2, at points A, B, C? (Zero, up, down, right, left?) 33. What is the direction of velocity of the object, in Fig. 2, at points A, B, C? (Zero, up, down, right, left?) 34. How is Fc represented in a FBD?- it is the net force pointing towards the center.

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