Topic 1 Topic 2 Topic 3 Topic 4

Topic 1 Topic 2 Topic 3 Topic 4 $100 $200 $300 $400 $500

Topic 1 - $100 Richard is conducting an experiment to see how far a rubber ball will roll when he releases it at the top of an inclined plane. Why does the ball speed up as it travels down the inclined plane? A. The force of gravity pulls the ball down the inclined plane. B. The force of friction is reduced because the ball is rubber. C. The ball has less magnetic attraction to the plane as it travels. D. The ball has a greater mass as it travels faster.

Topic 1 - $100 A. The force of gravity pulls the ball down the inclined plane.

Topic 1 - $200 Maria roller skates to the top of a hill and then starts rolling downward. What are the MAIN forces affecting Maria’s motion as she rolls down the hill? A. gravity and magnetism B. speed and friction C. friction and gravity D. push and pull

Topic 1 - $200 C. friction and gravity

Topic 1 - $300 Caleb is studying the Law of Gravity. For an assignment, he needs to come up with an example of events in which the force of gravity has been overcome. Which example should Caleb include? A. riding in a train B. falling out of a chair C. jumping up into the air D. standing on a tall building

Topic 1 - $300 C. jumping up into the air

Topic 1 - $400 Devlin is riding his bicycle to school. Which pair of forces is at work between Devlin's tires and the road? A. friction and push B. gravity and pull C. magnetism and friction D. pull and magnetism

Topic 1 - $400 A. friction and push

Topic 1 - $500 Cassandra knows that refrigerator magnets use magnetic force to stick. Which of the following is an example of something else that uses a magnetic force? A. a boat B. a compass C. a plant D. a swing

Topic 1 - $500 B. a compass

Topic 2 - $100 The gravitational force between two objects can cause the objects to move. Which of the following affects the gravitational force? A. magnetism B. shape C. temperature D. mass

Topic 2 - $100 D. mass

Topic 2 - $200 Petra is helping her parents to unpack some boxes. She lifts a full box with a mass of 15 kilograms. She empties out about half of the items from the box and lifts it again. Which is true regarding the force she applies after unloading the box? A. She has to apply a different type of force after changing the mass. B. She has to apply more force to lift the box because the mass is greater. C. She has to apply less force to lift the box because the mass has decreased. D. She has to apply the same amount of force to the box to overcome gravity.

Topic 2 - $200 C. She has to apply less force to lift the box because the mass has decreased.

Topic 2 - $300 Michael is pushing a TV set up a ramp to place it on a TV stand. What is the reason the TV set moves upward? A. There is no gravity when using an inclined plane. B. The force of gravity is greater than the force of Michael's pushing. C. The force of Michael's pushing is greater than the other forces acting on the TV. D. The ramp increases the friction, which helps Michael push the TV upward.

Topic 2 - $300 C. The force of Michael's pushing is greater than the other forces acting on the TV.

Topic 2 - $400 Michael pushes the TV halfway up the ramp and lets it go. The TV does not move. What is the main force keeping the TV in place? A. The TV stays in place because of friction. B. The TV stays in place because of momentum. C. The TV stays in place because of gravity. D. The TV stays in place because of its speed.

Topic 2 - $400 A. The TV stays in place because of friction.

Topic 2 - $500 A few minutes after Michael lets go of the TV on the ramp, the TV starts moving slowly down the ramp. What is the best explanation for why this happens? A. There is too much friction. B. Wind is pushing down on the TV. C. Michael's momentum was used up after a few minutes. D. The force of gravity is greater than all other forces working on the TV.

Topic 2 - $500 D. The force of gravity is greater than all other forces working on the TV.

Topic 3 - $100 Sue places magnets on three identical toy cars to give them different masses. Then, Sue measures how far each car rolls when she launches it from the same starting point using the same stretched rubber band. The three toy cars are pictured in the following illustration. How will the force of the rubber band affect the cars? A Car 3 will travel the longest distance. B Car 1 will travel the shortest distance. C Car 3 will have the least change in its motion. D Car 1 will have the greatest change in its motion

Topic 3 - $100 C Car 3 will have the least change in its motion.

Topic 3 - $200 Tori tests how far three identical toy cars travel under three different conditions. The following diagram shows the conditions before each car is released. How is Tori controlling variables in her experiment? A The mass and force will change for each trial. B Neither the mass nor force will change for each trial. C The mass will change for each trial, but the force will not change. D The force will change for each trial, but the mass will not change.

Topic 3 - $200 C The mass will change for each trial, but the force will not change.

Topic 3 - $300 Katie sits on the ground and rests her hands on a bowling ball in front of her. She uses all her force to push the bowling ball away from her body. Next, Katie rests her hands on a soccer ball situated in front of her at the same location. She uses all her force to push the soccer away from her body. How does the movement of the two balls contrast? A The soccer ball accelerates faster and moves a greater distance because more force is acting on it. B The soccer ball accelerates faster and moves a greater distance because it has less mass. C The bowling ball accelerates faster and moves a greater distance because it has more mass. D The bowling ball accelerates slower and moves a shorter distance because less force is acting on it.

Topic 3 - $300 B The soccer ball accelerates faster and moves a greater distance because it has less mass.

Topic 3 - $400 Kaneesha pushes a toy truck and lets it roll across a flat surface. She measures the distance it travels. Kaneesha repeats this for several trials, using the same amount of force each time, but she adds different numbers of wood blocks of identical mass to her truck. Kaneesha’s results are shown in the following table. Truck load Average distance (cm) 1 wood block 92 2 wood blocks ? 3 wood blocks 30 Which measurement is likely to be closest to the result for Kaneesha’s trial with 2 wood blocks? A 12 cm B 30 cm C 57 cm D 98 cm

Topic 3 - $400 C 57 cm

Topic 3 - $500 Stefan loads three books onto a cart. Then he pushes the cart on a track so it just reaches the track’s end. Next he puts six books onto the cart. What must he do when pushing the cart so it will reach the end of the track? A use less force B use more force C use the same amount of force D use the same amount of force, but add three more books

Topic 3 - $500 B use more force

Topic 4 - $100 A rock is balanced on the side of a long, sloping hill. Although the rock is very heavy, a gentle push causes it to start moving down the slope. How can a small force cause a large mass to move? A To make an object move, the direction of the force is important, but not the amount of force. B The push on the rock increased the amount of friction, so the rock started to move. C The small push balanced the forces that were keeping the rock in place and caused it to move. D The forces on the rock were balanced, and a small additional force caused them to be unbalanced.

Topic 4 - $100 D The forces on the rock were balanced, and a small additional force caused them to be unbalanced.

Topic 4 - $200 A group of students measured the amount of force needed to move a bucket across a dry plastic tabletop. Then they poured some water on the table and repeated the experiment on the wet surface. The students found that less force was needed to make the bucket start moving on the wet surface than the dry surface. What caused the difference in the results? A change in the amount of gravitational force on the bucket B change in the mass of the bucket used in the experiment C change in the friction between the bucket and the surface D change in the friction between the bucket and the scale used to measure force

Topic 4 - $200 C change in the friction between the bucket and the surface

Topic 4 - $300 On two different days, two students measured the force required to hold a pair of scissors using a spring scale. How should the results of the two measurements compare? A The results should be the same because the mass of the scissors and the force of gravity are the same. B The results should be the same because friction does not change between the two experiments. C The results should be different because two people never perform an experiment exactly the same way. D The results should be different because changes in conditions between different days will cause the results to change.

Topic 4 - $300 A The results should be the same because the mass of the scissors and the force of gravity are the same.

Topic 4 - $400 When two forces act on an object, the movement of the object depends on both forces. The pictures below show forces acting on a box. Which picture shows a situation where the box would remain still? A B C D

Topic 4 - $400 B

Topic 4 - $500 Jack is pulling a rope to the left. Singh is pulling the rope to the right. The rope stays in the same position. Which of these best explains why the rope does not move? A The two forces are acting in the same direction. B The two forces are equal and balance each other out. C Two forces cannot act on one object at the same time. D The force to the left is greater than the force to the right.

Topic 4 - $500 B The two forces are equal and balance each other out.