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25 questions
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- Q1Steve and Barry are racing each other, and Barry is winning. If barry is moving faster than steve, from which reference point is barry's position increasing through time?Steve's reference pointan observer in front of Steve and BarryBarry's reference pointthe finish line120s
- Q2Penny also has two identical wagons. She puts one dog in each wagon and pushes each wagon with the same amount of force. The wagons travel in a straight line on level ground. Which of the following statements best compares the motion of the two wagons?Fluffy's wagon will stop first.The wagons will both move in the same way.Fluffy's wagon will move faster.Butch's wagon will move faster.120s
- Q3An object that is moving will stop moving whensomething pushes or pulls it to a stop.it has used up all its momentum.it has stopped speeding up.the force that is making it move stops pushing it.120s
- Q4Isaac and Hailey set a wooden sailboat in a big puddle after a rainstorm. They sat on opposite sides of the boat, and on the count of three, they each began to blow as hard as they could on the sail of the boat. After a few seconds, the boat began to move toward Isaac. What happened?The force Isaac's breath exerted... was stronger than Hailey's.The forces... were equal and opposite.The forces... were equal and in the same direction.The force Hailey's breath exerted on the boat was stronger than Isaac's.120s
- Q5A speedboat is moving at a constant speed, and the force propelling it forward is balanced by the force of the water pulling it backward. But suddenly a wave strikes it from the side with a force of 500 newtons. When the wave hits the boat,the speedboat's direction of motion will change.a net force of 4,000 N will act on the speedboat.the forces acting... will stay balanced.a net force of 8,000 N will act on the speedboat.120s
- Q6What is the SI unit for force?newtons (N)meters (m)liters (L)kilograms (kg)60s
- Q7Suppose a bicycle was coasting on a level surface, and there was no friction. What would happen to the bicycle?It would slow down until it finally came to a stop.It would keep going at constant speed.It would slow down but would never stop.It would speed up since there is no friction.120s
- Q8Kent is twirling a ball attached to a string in a clockwise direction. If Kent lets go of the string, which of the following describes the motion that the ball will take if there are no gravitational forces influencing the motion of the ball?It will curve up and then fall to the ground.It will curve down and then turn back up.It will fall straight to the ground.It will continue in a straight line.120s
- Q9A book is sitting on a table at rest. Which of the following best describes the forces acting on the book?The forces on the book are unbalanced because the gravity pushing up on the book is not equal to the friction from the table pushing the book to the right.The forces on the book are unbalanced because the gravity pushing down on the book is not equal to the force of the table pushing up on the book.The forces on the book are balanced because the gravity pulling down on the book is equal to the upward force applied by the table.The forces on the book are balanced forces because the gravity pushing up on the book is equal to the friction from the table pushing the book to the right.120s
- Q10Chip and Don are racing in go-karts. Chip is directly behind Don as they reach the straightaway. Both drivers are going the top speed of 25 mph. If chip is the reference point, which statement correctly describes don's motion relative to Chip?Don is speeding up.Don is not moving.Don is slowing down.Don is moving at 25 mph.120s
- Q11A gardener uses a wheelbarrow to move soil from a truck to his garden. On the first trip from the truck to the garden, the wheelbarrow is half-full of soil and the gardener applies a certain force to cause it to accelerate. On the second trip, the wheelbarrow is full of soil. Although the gardener applies the same amount of force to the wheelbarrow, he cannot move it with the same rate of acceleration. What should the gardener do to move the wheelbarrow at the same rate of acceleration for the second trip?reduce the amount of soil by one-half and apply the same amount of forcedouble the amount of soil, and apply less forcekeep the amount of soil the same and apply less forcereduce the amount of soil by one-quarter and apply the same amount of force120s
- Q12Three dogs—Ed, Max, and Marcie—are pulling a dogsled along a patch of ice. Ed pulls with a force of 115 N; Max pulls with a force of 62 N; and Marcie pulls with a force of 90 N. If there are no forces pulling the sled backward, what is the net force acting on the sled?267 N forward205 N forward177 N forward0 N120s
- Q13Clara is shopping in a grocery store with her friend. Each has their own shopping cart in which they want to place their items. The shopping carts are identical. Clara and her friend add the same type and number of items to each of their carts. In the baking aisle, however, Clara adds 20 pounds of sugar to her own cart, and her friend adds only 10 pounds of sugar to her own cart. Which of the following statements best explains what Clara must do to accelerate at the same rate as her friend?She must apply less force to move her cart.She must apply more force to move her cart.She must add more sugar to her cart.She must add 20 pounds of salt instead of 20 pounds of sugar to her cart.120s
- Q14Tim has just jumped out of an airplane. The force of gravity pulls him downward, while air resistance pushes him upward. What is the net force acting on Tim?0 newtons80 newtons downward705 newtons downward625 newtons upward120s
- Q15A cart is rolling to the right across the floor at a constant speed of 2 meters per second. The cart is pushed again to the right, and it starts to speed up. How are the force of the push and speed of the cart related?The balanced push causes the cart to speed up.The force and speed are not related.The force of gravity makes the cart speed up.The unbalanced push causes the cart to speed up.120s
