Forces and Motion Quiz

Priya records the distance her bicycle travels every second as she pedals at a steady speed. Which type of graph should Priya use to best represent the relationship between distance and time?

• Bar graph

• Line graph

• Pie chart

• Scatter plot

Answer explanation

Priya should use a line graph to represent the relationship between distance and time, as it effectively shows continuous data and trends over time, illustrating how distance changes as she pedals.

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A ball rolls across the floor at a constant speed. If the ball travels 12 meters in 4 seconds, what is its speed?

• 2 m/s

• 3 m/s

• 4 m/s

• 6 m/s

Answer explanation

To find the speed, divide the distance by time. Speed = Distance / Time = 12 meters / 4 seconds = 3 m/s. Therefore, the correct answer is 3 m/s.

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A student observes that when she pushes a box, it moves, but when she stops pushing, the box stops moving. Which type of force is she demonstrating?

• Magnetic force

• Gravitational force

• Contact force

• Electrical force

Answer explanation

The student is demonstrating a contact force, as the box moves only when she applies a push. When she stops, the force is removed, causing the box to stop. This illustrates how contact forces require direct interaction to act.

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Which of the following situations best demonstrates a force acting at a distance?

• Anika kicking a soccer ball

• A magnet attracting a paperclip

• Henry pushing a door

• A book resting on a table

Answer explanation

A magnet attracting a paperclip demonstrates a force acting at a distance, as the magnet exerts a magnetic force without direct contact. In contrast, the other options involve contact forces.

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Liam and Grace are watching an apple fall from a tree. Liam says gravity only acts on Earth. Grace says gravity acts between all objects with mass. Who is correct and why?

• Liam, because gravity is only on Earth

• Grace, because gravity acts between all objects with mass

• Both are correct

• Neither is correct

Answer explanation

Grace is correct because gravity is a universal force that acts between all objects with mass, not just on Earth. This means that every mass attracts every other mass, regardless of their location.

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Arjun and Isla are holding two magnets close together. If Arjun moves his magnet farther away from Isla's magnet, what happens to the gravitational force between them?

• It increases

• It decreases

• It stays the same

• It disappears

Answer explanation

As Arjun moves his magnet farther away from Isla's magnet, the gravitational force between them decreases. This is because gravitational force weakens with increasing distance, following the inverse square law.

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A soccer ball is at rest on the field. A player kicks the ball, and it starts moving. Which statement best explains what happened?

• A balanced force acted on the ball

• An unbalanced force changed the ball’s motion

• Gravity stopped the ball

• The ball moved on its own

Answer explanation

An unbalanced force, in this case from the player's kick, acted on the soccer ball, causing it to change from rest to motion. This demonstrates Newton's first law of motion, where an object at rest stays at rest until acted upon.

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William is driving a car straight down the road and suddenly turns left. What caused the change in direction?

• Balanced forces

• Unbalanced force

• Gravity

• Friction only

Answer explanation

The change in direction when William turns left is due to an unbalanced force acting on the car. This force, likely from the steering mechanism, alters the car's motion, demonstrating Newton's first law of motion.

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Aiden is building a ramp to see how changing its height affects how fast his toy car goes. Which variable should Aiden change in his experiment?

• The type of car

• The height of the ramp

• The length of the ramp

• The color of the car

Answer explanation

Aiden should change the height of the ramp because it directly affects the speed of the toy car. The experiment aims to see how varying the ramp's height influences the car's speed, making it the key variable to manipulate.

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James is walking along a straight path and records the following data: Time (s): 0, 1, 2, 3; Distance (m): 0, 2, 4, 6. What is the speed at which James is walking?

• 1 m/s

• 2 m/s

• 3 m/s

• 6 m/s

Answer explanation

To find speed, use the formula: speed = distance/time. The total distance is 6 m and the total time is 3 s. Thus, speed = 6 m / 3 s = 2 m/s. Therefore, James is walking at 2 m/s.

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