Forces and Motion Quiz

Grade 3 · Science · Quiz

Test your knowledge of forces, gravity, friction, and how objects move.

Questions

Gravity only affects large objects like planets and buildings.
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Answer: False
Gravity affects every object with mass, no matter how small. Even a tiny dust particle is pulled down by gravity.
What happens to an object's motion when equal forces push on it from opposite sides?
1. It speeds up
2. It slows down
3. It stays the same
4. It moves sideways
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Answer: It stays the same
When equal forces push from opposite sides, they cancel each other out (balanced forces). The object's motion does not change.
The force that acts between two surfaces rubbing against each other is called ___.
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Answer: friction
Friction occurs when two surfaces are in contact and moving against each other. It converts motion energy into heat.
A soccer player kicks a ball. What force starts the ball moving?
1. Gravity
2. Friction from the air
3. The kick (applied force)
4. Magnetism
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Answer: The kick (applied force)
The kick is an applied contact force from the player's foot. It transfers energy to the ball and starts it moving.
Objects fall toward Earth because of gravity.
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Answer: True
Earth's gravitational pull accelerates all falling objects downward at the same rate of about 9.8 m/s² near the surface.
Which of these would slow a rolling ball down the most?
1. Rolling on smooth ice
2. Rolling on tile floor
3. Rolling on thick carpet
4. Rolling in outer space
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Answer: Rolling on thick carpet
Thick carpet creates the most friction. In outer space there's no friction at all, so a ball would roll forever without stopping!
How fast an object moves is called its ___.
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Answer: speed
Speed tells us how quickly something covers distance. If a car travels 60 miles in one hour, its speed is 60 miles per hour.
A heavier object needs more force to move than a lighter object.
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Answer: True
A heavier object has more mass and requires more force to accelerate. This is why pushing a full shopping cart is harder than pushing an empty one.
What force pulls a dropped pencil toward the floor?
1. Friction
2. Magnetism
3. Gravity
4. Air resistance
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Answer: Gravity
Gravity is the downward force that makes dropped objects fall. Without gravity, the pencil would just float in place.
You can change the direction of a moving object by applying a force to it.
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Answer: True
Applying a force at an angle to a moving object's direction will change its path. This is why hitting a baseball sideways sends it in a new direction.

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