Slide 1 / 40 Slide 2 / 40 8th Grade Forces and Motion Study Guide www.njctl.org Slide 3 / 40 1 A snail travels 10 m in 3000 seconds. What is the snail's average speed? 60000 m/s A 0.02 m/s B 600 m/s C 0.003 m/s D
Slide 3 (Answer) / 40 1 A snail travels 10 m in 3000 seconds. What is the snail's average speed? 60000 m/s A 0.02 m/s B D Answer 600 m/s C 0.003 m/s D [This object is a pull tab] Slide 4 / 40 2 A blimp travels at 3 m/s for 1000 s. What distance does the blimp cover in that time? 500 m/s A 3000 m B 4500 m/s C 500 m D Slide 4 (Answer) / 40 2 A blimp travels at 3 m/s for 1000 s. What distance does the blimp cover in that time? 500 m/s A B Answer 3000 m B 4500 m/s C [This object is a pull tab] 500 m D
Slide 5 / 40 3 When your teacher times your mile run at 8.2 minutes, that means your speed was 0.12 mi/min. Was this your average speed or your instantaneous speed? A Average Speed B Instantaneous Speed Slide 5 (Answer) / 40 3 When your teacher times your mile run at 8.2 minutes, that means your speed was 0.12 mi/min. Was this your average speed or your instantaneous speed? A Average Speed avg speed = Answer B Instantaneous Speed 8.2mi/min [This object is a pull tab] Slide 6 / 40 4 Does a speedometer measure the average speed or the instantaneous speed? A Average Speed B Instantaneous Speed
Slide 6 (Answer) / 40 4 Does a speedometer measure the average speed or the instantaneous speed? A Average Speed B Instantaneous Speed Instantaneous Answer Speed [This object is a pull tab] Slide 7 / 40 5 A swordfish travels for two hours. The first hour he covers 110 kilometers, and the second hour he covers 110 kilometers. What is the average speed of the swordfish? Hint: Remember 55 km/h A that average speed is total distance 84 km/h B travelled divided by 110 km/h total time C 194 km/h D Slide 7 (Answer) / 40 5 A swordfish travels for two hours. The first hour he covers 110 kilometers, and the second hour he covers 110 kilometers. What is the average speed of the swordfish? Hint: Remember 55 km/h A that average speed C Answer 84 km/h is total distance B travelled divided by 110 km/h C total time [This object is a pull tab] 194 km/h D
Slide 8 / 40 6 A dog walks outside to go the bathroom every day. If she walks outside at a speed of 3 meters per second and walks 150 meters before she uses the bathroom, how long does it take her? 50 seconds A 2 minutes B 188 seconds C 90 seconds D Slide 8 (Answer) / 40 6 A dog walks outside to go the bathroom every day. If she walks outside at a speed of 3 meters per second and walks 150 meters before she uses the bathroom, how long does it take her? 50 seconds A 2 minutes B Answer A 188 seconds C [This object is a pull tab] 90 seconds D Slide 9 / 40 7 Carlos and Gina are riding on their horses to go into town. They travel 140 meters in 14 seconds going west. What is their velocity? 490 m/s west A 10 m/s west B 490 m/s C 10 m/s D
Slide 9 (Answer) / 40 7 Carlos and Gina are riding on their horses to go into town. They travel 140 meters in 14 seconds going west. What is their velocity? 490 m/s west A 10 m/s west B Answer B 490 m/s C 10 m/s D [This object is a pull tab] Slide 10 / 40 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 position relative to its starting position? 50 km west A 150 km west B 250 km west C 50 km east D Slide 10 (Answer) / 40 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 position relative to its starting position? 50 km west A 150 km west B 250 km west C C Answer 50 km east D [This object is a pull tab]
Slide 11 / 40 9 A nitro-methane powered top fuel dragster launches from rest to race against an opponent. Why did the car accelerate? A increased speed B decreased speed C changed direction Slide 11 (Answer) / 40 9 A nitro-methane powered top fuel dragster launches from rest to race against an opponent. Why did the car accelerate? A increased speed B decreased speed A Answer C changed direction [This object is a pull tab] Slide 12 / 40 10 A driver hits the brakes to slow down at an intersection. As the car's speed is decreasing it has A positive acceleration B negative acceleration C no acceleration D more information is needed
Slide 12 (Answer) / 40 10 A driver hits the brakes to slow down at an intersection. As the car's speed is decreasing it has A positive acceleration B negative acceleration B Answer C no acceleration [This object is a pull tab] D more information is needed Slide 13 / 40 11 Which of the following graphs depicts the acceleration of a runner speeding up to pass someone. Y Y B A Speed (m/s) Speed (m/s) x x Time (s) Time (s) Y Y C Speed (m/s) D Speed (m/s) x x Time (s) Time (s) Slide 13 (Answer) / 40 11 Which of the following graphs depicts the acceleration of a runner speeding up to pass someone. Y Y B A Speed (m/s) Speed (m/s) x x Time (s) Time (s) C Y Answer Y C Speed (m/s) D Speed (m/s) x x [This object is a pull Time (s) tab] Time (s)
Slide 14 / 40 12 Which of the following speed vs time graphs corresponds to the position vs time graph shown in the graph below? A B C Slide 14 (Answer) / 40 12 Which of the following speed vs time graphs corresponds to the position vs time graph shown in the graph below? A A Answer B [This object is a pull tab] C Slide 15 / 40 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 acceleration of the ball? A 4 m/s B 4 m/s/s C 1 m/s D 1 m/s/s
Slide 15 (Answer) / 40 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 acceleration of the ball? A 4 m/s B 4 m/s/s Answer D C 1 m/s D 1 m/s/s [This object is a pull tab] Slide 16 / 40 14 Forces are all around us. Which of the following do you think are examples of forces? (choose all that apply) A Gravity B Friction C Muscles D Wind Slide 16 (Answer) / 40 14 Forces are all around us. Which of the following do you think are examples of forces? (choose all that apply) A Gravity B Friction Answer A & B C Muscles D Wind [This object is a pull tab]
Slide 17 / 40 15 What is the SI unit for force? A Pounds B Kilograms C Newtons Slide 17 (Answer) / 40 15 What is the SI unit for force? A Pounds B Kilograms Answer C C Newtons [This object is a pull tab] Slide 18 / 40 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 force acting on the car and is it balanced? A -30 N unbalanced B -10 N unbalanced C -10 N balanced D + 30 balanced
Slide 18 (Answer) / 40 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 force acting on the car and is it balanced? A -30 N unbalanced B Answer B -10 N unbalanced C -10 N balanced [This object is a pull tab] D + 30 balanced Slide 19 / 40 17 The force of gravitation between an object and a planet is increased as they move away from each other: True False Slide 19 (Answer) / 40 17 The force of gravitation between an object and a planet is increased as they move away from each other: True False False Answer [This object is a pull tab]
Slide 20 / 40 18 A 100 kg kid is on the moon, where g = 1.67 m/s 2 . What is the boy's weight? A 83.5 kg B 167 kg C 167 N D 29.9 N Slide 20 (Answer) / 40 18 A 100 kg kid is on the moon, where g = 1.67 m/s 2 . What is the boy's weight? A 83.5 kg B 167 kg C Answer C 167 N D 29.9 N [This object is a pull tab] Slide 21 / 40 19 What is the net force acting on the object below? -10 N 7 N -8 N
Slide 21 (Answer) / 40 19 What is the net force acting on the object below? -10 N Answer -11 N 7 N [This object is a pull tab] -8 N Slide 22 / 40 20 Is the object in equilibrium? Yes No -10 N 7 N -8 N Slide 22 (Answer) / 40 20 Is the object in equilibrium? Yes No -10 N Answer No 7 N [This object is a pull tab] -8 N
Slide 23 / 40 21 What is the net force acting on the object below? -10 N 25 N -15N Slide 23 (Answer) / 40 21 What is the net force acting on the object below? -10 N Answer 0 N 25 N [This object is a pull tab] -15N Slide 24 / 40 22 Is the object in equilibrium? Yes No -10 N 25 N -15N
Slide 24 (Answer) / 40 22 Is the object in equilibrium? Yes No -10 N 25 N Answer Yes [This object is a pull tab] -15N Slide 25 / 40 23 Acceleration due to gravity on Jupiter is 26.1 m/s 2 . How much would a 25 kg person weigh on Jupiter? Slide 25 (Answer) / 40 23 Acceleration due to gravity on Jupiter is 26.1 m/s 2 . How much would a 25 kg person weigh on Jupiter? 653 N Answer [This object is a pull tab]
Slide 26 / 40 24 Acceleration due to gravity on Earth's Moon is 1.67 m/s 2 . How much would a 113 kg person weigh on Earth's Moon? Slide 26 (Answer) / 40 24 Acceleration due to gravity on Earth's Moon is 1.67 m/s 2 . How much would a 113 kg person weigh on Earth's Moon? 189 N Answer [This object is a pull tab] Slide 27 / 40 25 Inertia is the reluctance any material object has to change its state of motion. True False
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