D Answer 600 m/s 600 m/s C C 0.003 m/s 0.003 m/s D D [This - PDF document

Slide 1 / 40 Slide 2 / 40 8th Grade Forces and Motion Study Guide www.njctl.org Slide 3 / 40 Slide 3 (Answer) / 40 1 A snail travels 10 m in 3000 seconds. What is the 1 A snail travels 10 m in 3000 seconds. What is the snail's average speed? snail's average speed? 60000 m/s 60000 m/s A A 0.02 m/s 0.02 m/s B B D Answer 600 m/s 600 m/s C C 0.003 m/s 0.003 m/s D D [This object is a pull tab] Slide 4 / 40 Slide 4 (Answer) / 40 2 A blimp travels at 3 m/s for 1000 s. What distance 2 A blimp travels at 3 m/s for 1000 s. What distance does the blimp cover in that time? does the blimp cover in that time? 500 m/s 500 m/s A A B Answer 3000 m 3000 m B B 4500 m/s 4500 m/s C C [This object is a pull tab] 500 m 500 m D D

Slide 5 / 40 Slide 5 (Answer) / 40 3 When your teacher times your mile run at 8.2 3 When your teacher times your mile run at 8.2 minutes, that means your speed was 0.12 mi/min. minutes, that means your speed was 0.12 mi/min. Was this your average speed or your instantaneous Was this your average speed or your instantaneous speed? speed? A Average Speed A Average Speed avg speed = Answer B Instantaneous Speed B Instantaneous Speed 8.2mi/min [This object is a pull tab] Slide 6 / 40 Slide 6 (Answer) / 40 4 Does a speedometer measure the average speed or 4 Does a speedometer measure the average speed or the instantaneous speed? the instantaneous speed? A Average Speed A Average Speed B Instantaneous Speed B Instantaneous Speed Instantaneous Answer Speed [This object is a pull tab] Slide 7 / 40 Slide 7 (Answer) / 40 5 A swordfish travels for two hours. The first hour he 5 A swordfish travels for two hours. The first hour he covers 110 kilometers, and the second hour he covers 110 kilometers, and the second hour he covers 110 kilometers. What is the average speed of covers 110 kilometers. What is the average speed of the swordfish? the swordfish? Hint: Remember Hint: Remember 55 km/h 55 km/h A A that average speed that average speed C Answer 84 km/h is total distance 84 km/h is total distance B B travelled divided by travelled divided by 110 km/h 110 km/h C total time C total time [This object is a pull tab] 194 km/h 194 km/h D D

Slide 8 / 40 Slide 8 (Answer) / 40 6 A dog walks outside to go the bathroom every day. If 6 A dog walks outside to go the bathroom every day. If she walks outside at a speed of 3 meters per second she walks outside at a speed of 3 meters per second and walks 150 meters before she uses the bathroom, and walks 150 meters before she uses the bathroom, how long does it take her? how long does it take her? 50 seconds 50 seconds A A 2 minutes 2 minutes B B Answer A 188 seconds 188 seconds C C [This object is a pull tab] 90 seconds 90 seconds D D Slide 9 / 40 Slide 9 (Answer) / 40 7 Carlos and Gina are riding on their horses to go into 7 Carlos and Gina are riding on their horses to go into town. They travel 140 meters in 14 seconds going town. They travel 140 meters in 14 seconds going west. What is their velocity? west. What is their velocity? 490 m/s west 490 m/s west A A 10 m/s west 10 m/s west B B Answer B 490 m/s 490 m/s C C 10 m/s 10 m/s D D [This object is a pull tab] Slide 10 / 40 Slide 10 (Answer) / 40 8 A car travels 200 km/h west for 2 hours. The car then 8 A car travels 200 km/h west for 2 hours. The car then travels 150 km/h east for one hour. What is the car's travels 150 km/h east for one hour. What is the car's position relative to its starting position? position relative to its starting position? 50 km west 50 km west A A 150 km west 150 km west B B 250 km west 250 km west C C C Answer 50 km east 50 km east D D [This object is a pull tab]

Slide 11 / 40 Slide 11 (Answer) / 40 9 A nitro-methane powered top fuel dragster 9 A nitro-methane powered top fuel dragster launches from rest to race against an opponent. launches from rest to race against an opponent. Why did the car accelerate? Why did the car accelerate? A increased speed A increased speed B decreased speed B decreased speed A Answer C changed direction C changed direction [This object is a pull tab] Slide 12 / 40 Slide 12 (Answer) / 40 10 A driver hits the brakes to slow down at an 10 A driver hits the brakes to slow down at an intersection. As the car's speed is decreasing it has intersection. As the car's speed is decreasing it has A positive acceleration A positive acceleration B negative acceleration B negative acceleration B Answer C no acceleration C no acceleration [This object is a pull tab] D more information is needed D more information is needed Slide 13 / 40 Slide 13 (Answer) / 40 11 Which of the following graphs depicts the 11 Which of the following graphs depicts the acceleration of a runner speeding up to pass acceleration of a runner speeding up to pass someone. someone. Y Y Y Y B B A A Speed (m/s) Speed (m/s) Speed (m/s) Speed (m/s) x x x x Time (s) Time (s) Time (s) Time (s) C Answer Y Y Y Y C Speed (m/s) C Speed (m/s) D Speed (m/s) D Speed (m/s) x x x x [This object is a pull Time (s) Time (s) tab] Time (s) Time (s)

Slide 14 / 40 Slide 14 (Answer) / 40 12 Which of the following speed vs time graphs 12 Which of the following speed vs time graphs corresponds to the position vs time graph shown in corresponds to the position vs time graph shown in the graph below? the graph below? A A A Answer B B [This object is a pull tab] C C Slide 15 / 40 Slide 15 (Answer) / 40 13 A ball is traveling down a hill at 4 m/s. If the ball 13 A ball is traveling down a hill at 4 m/s. If the ball increases in speed to 8 m/s in 4 seconds, what is the increases in speed to 8 m/s in 4 seconds, what is the acceleration of the ball? acceleration of the ball? A 4 m/s A 4 m/s B 4 m/s/s B 4 m/s/s Answer D C 1 m/s C 1 m/s D 1 m/s/s D 1 m/s/s [This object is a pull tab] Slide 16 / 40 Slide 16 (Answer) / 40 14 Forces are all around us. Which of the following 14 Forces are all around us. Which of the following do you think are examples of forces? (choose all do you think are examples of forces? (choose all that apply) that apply) A Gravity A Gravity B Friction B Friction A & B Answer C Muscles C Muscles D Wind D Wind [This object is a pull tab]

Slide 17 / 40 Slide 17 (Answer) / 40 15 What is the SI unit for force? 15 What is the SI unit for force? A Pounds A Pounds B Kilograms B Kilograms Answer C C Newtons C Newtons [This object is a pull tab] Slide 18 / 40 Slide 18 (Answer) / 40 16 A +20 N force acts on a car and at the same time, 16 A +20 N force acts on a car and at the same time, a -30 N force acts on the car. What is the net a -30 N force acts on the car. What is the net force acting on the car and is it balanced? force acting on the car and is it balanced? A -30 N unbalanced A -30 N unbalanced B Answer B -10 N unbalanced B -10 N unbalanced C -10 N balanced C -10 N balanced [This object is a pull tab] D + 30 balanced D + 30 balanced Slide 19 / 40 Slide 19 (Answer) / 40 17 The force of gravitation between an object and a 17 The force of gravitation between an object and a planet is increased as they move away from each planet is increased as they move away from each other: other: True True False False False Answer [This object is a pull tab]

Slide 20 / 40 Slide 20 (Answer) / 40 18 A 100 kg kid is on the moon, where g = 1.67 m/s 2 . 18 A 100 kg kid is on the moon, where g = 1.67 m/s 2 . What is the boy's weight? What is the boy's weight? A 83.5 kg A 83.5 kg B 167 kg B 167 kg C Answer C 167 N C 167 N D 29.9 N D 29.9 N [This object is a pull tab] Slide 21 / 40 Slide 21 (Answer) / 40 19 What is the net force acting on the object below? 19 What is the net force acting on the object below? -10 N -10 N Answer -11 N 7 N 7 N [This object is a pull tab] -8 N -8 N Slide 22 / 40 Slide 22 (Answer) / 40 20 Is the object in equilibrium? 20 Is the object in equilibrium? Yes Yes No No -10 N -10 N Answer No 7 N 7 N [This object is a pull tab] -8 N -8 N

Slide 23 / 40 Slide 23 (Answer) / 40 21 What is the net force acting on the object below? 21 What is the net force acting on the object below? -10 N -10 N Answer 0 N 25 N 25 N [This object is a pull tab] -15N -15N Slide 24 / 40 Slide 24 (Answer) / 40 22 Is the object in equilibrium? 22 Is the object in equilibrium? Yes Yes No No -10 N -10 N 25 N 25 N Answer Yes [This object is a pull tab] -15N -15N Slide 25 / 40 Slide 25 (Answer) / 40 23 Acceleration due to gravity on Jupiter is 26.1 m/s 2 . 23 Acceleration due to gravity on Jupiter is 26.1 m/s 2 . How much would a 25 kg person weigh on Jupiter? How much would a 25 kg person weigh on Jupiter? 653 N Answer [This object is a pull tab]