To review for tomorrow’s quiz, play this review game. Use your checklist as you play! Ch.1-1 Motion

Instructions To play: ◦Read the question slide. ◦Wait until everyone in your group has an answer written down. ◦Click the power point to the next slide and reveal the answer. ◦If you got the answer correct, great going! Check that off of your list. ◦If you got the answer incorrect, be sure to write the correct answer on your worksheet quickly!

Question 1: Velocity Define velocity

Answer 1: Velocity Velocity is the speed of an object in a particular direction.

Question 2: Reference Points Choose the reference point(s) in the following sentence. ◦First, you walk 2 meters and make a right at the McDonalds. Then you follow the arrows on the sidewalk to the yellow house on the left.

Answer 2: Reference Points McDonalds Arrows Sidewalk Yellow House

Question 3: Motion Define Motion.

Answer 3: Motion Motion is an objects change in position relative to a reference point.

Question 4: Motion Explain how two cars in a race can be used as reference points.

Answer 4: Motion If two cars are racing each other, you can tell how fast each car is going relative to the other. ◦For example if there is a red car and a blue car in a race, I can tell that the blue car is winning because it is well in front of the red car (reference point). This tells me that the blue car is moving faster in reference to the red car. StartStart FinishFinish

Question 5: Speed Define speed.

Answer 5: Speed Speed is the distance traveled by an object divided by the time during which the motion occurred.

Question 6: Speed In the graph below, label the x and y axis if we were representing speed.

Answer 6: Speed Time (s) Distance (m)

Question 7: Speed Is the speed increasing or decreasing in the graph below? Time (s) Distance (m)

Answer 7: Speed Time (s) Distance (m) The speed is increasing in the graph because, as time goes by, the distance the car travels is increasing as well.

Question 8: Acceleration Define acceleration.

Answer 8: Acceleration Acceleration is the rate at which velocity changes over time.

Question 9: Acceleration When does an object accelerate?

Answer 9: Acceleration An object accelerates when it changes speed, direction, or both.

Question 10: Resultant Velocity Solve for the resultant velocity. ◦ A dog is in a car traveling at a velocity of 87 m/s North. The dog runs to the front of the car with a velocity of 2 m/s. What is the dogs’ resultant velocity?

Answer 10: Resultant Velocity 87m/s N + 2m/s N = 89 m/s North You add the two velocities together because they are going in the same direction. You know to add and not to use velocity=distance/time because we were not given data for distance or time.(be sure to read the word problems carefully to see what we are solving for)

Question 11: Acceleration A car is moving at a rate of 62 m/s south and accelerates at a rate of 6.0 m/s/s. What is the final velocity of the car after 4.0 seconds? Choose the correct formula. a= v 2 - v 1 v 2 = v 1 + a(t) d=s(t) t t= v 2 - v 1 v=ds=d a t td=s(v)

Answer 11: Acceleration Looking for: final velocity Solution X = 62 + (4)(6) X= X= 86 m/s S Given: V2 = X V1 = 62 m/s S t = 4 s a = 6 m/s/s Formula V2= V1 + (a)(t) A car is moving at a rate of 62 m/s south and accelerates at a rate of 6.0 m/s/s. What is its final velocity of the car after 4.0 seconds?

Question 12: Acceleration What are the two factors that determine acceleration?

Answer 12: Acceleration Change in velocity and time or Final Velocity, Starting Velocity, and time (think about the formula)

Question 13: Acceleration Is an object accelerating if it is slowing down?

Answer 13: Acceleration Yes, an object is accelerating if it is slowing down because it is changing speed. It is negatively accelerating to be specific.

Question 14: Speed If you travel 18 km and walk for 2.5 h, what is your average speed? Choose the correct formula. a= v 2 - v 1 v 2 = v 1 + a(t) d=s(t) t t= v 2 - v 1 v=ds=d a t td=s(v)

Answer 14: Speed If you travel 18 km and walk for 2.5 h, what is your average speed? Looking for: Speed Solution X= 18/2.5 X= 7.2 km/h Given s= X d= 18 km t= 2.5 h Formula s= d/t

Question 15: Reference Direction Write as many examples of reference directions as you can think of.

Answer 15: Reference Directions North, South, East, West, Up, Down, Left, Right, Forward, Backward, just beyond, in front of, behind, etc.