Forces and Motion Review 4

A car and a truck collide on a highway. According to Newton's Third Law, which of the following statements is true about the forces during the collision?

• The car exerts a greater force on the truck.

• The truck exerts a greater force on the car.

• The car and the truck exert equal forces on each other.

• The forces depend on the speed of the car.

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OK.SCI.8.PS2.1

Which of the following best describes how you would plan an investigation to determine how mass affects the acceleration of an object when a constant force is applied?

• Measure the speed of the object at different times.

• Change the mass of the object and measure the acceleration for each mass.

• Apply different forces to the object and measure the resulting speed.

• Use a single object and measure its speed at different distances.

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OK.SCI.8.PS2.2

A student observes that a magnet can attract a paperclip from a distance. What question could the student ask to determine the factors affecting the strength of the magnetic force?

• How does the color of the magnet affect its strength?

• Does the size of the paperclip affect the magnetic force?

• How does the temperature of the room affect the magnetic force?

• What is the distance at which the magnet can no longer attract the paperclip?

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OK.SCI.8.PS2.3

Which of the following arguments supports the claim that gravitational interactions are attractive and depend on the masses of interacting objects?

• Gravitational force increases with distance.

• Gravitational force is stronger between objects with larger masses.

• Gravitational force is only present on Earth.

• Gravitational force is repulsive between small objects.

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OK.SCI.8.PS2.4

Design an experiment to demonstrate that fields exist between objects exerting forces on each other even though they are not in contact. Which of the following setups would be most appropriate?

• Place a magnet near a compass and observe the needle's movement.

• Drop a ball and measure the time it takes to hit the ground.

• Use a spring to measure the force between two touching objects.

• Weigh an object on a scale.

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OK.SCI.8.PS2.5

If two ice skaters push off from each other, what can be said about the forces they exert on each other?

• The skater with more mass exerts a greater force.

• The skater with less mass exerts a greater force.

• Both skaters exert equal and opposite forces on each other.

• The forces depend on the speed of the skaters.

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OK.SCI.8.PS2.1

How would you plan an investigation to show that the change in an object's motion depends on the sum of the forces acting on it?

• Use a single force and measure the object's speed.

• Apply multiple forces in different directions and measure the resulting motion.

• Change the object's shape and measure its speed.

• Use a single object and measure its weight.

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OK.SCI.8.PS2.2

Which question would help determine the factors affecting the strength of electric forces between two charged objects?

• How does the color of the objects affect the electric force?

• Does the distance between the objects affect the electric force?

• How does the shape of the objects affect the electric force?

• What is the temperature of the objects?

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OK.SCI.8.PS2.3

Which statement supports the claim that gravitational interactions are attractive and depend on the masses of interacting objects?

• Gravitational force decreases with mass.

• Gravitational force is stronger between objects with smaller masses.

• Gravitational force is only present in space.

• Gravitational force is stronger between objects with larger masses.

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OK.SCI.8.PS2.4

To demonstrate that fields exist between objects exerting forces on each other even though they are not in contact, which experiment would be most effective?

• Use a charged balloon to move small pieces of paper without touching them.

• Drop a stone in water and observe the splash.

• Use a ruler to measure the length of a table.

• Weigh a book on a scale.

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OK.SCI.8.PS2.5