Exploring Force and Motion

What force pulls objects toward the center of the Earth?

• Magnetism

• Gravity

• Friction

• Electricity

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Which term describes a push or a pull on an object?

• Energy

• Force

• Mass

• Speed

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What is the unit used to measure speed?

• Kilograms

• Meters per second

• Newtons

• Liters

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Which factor increases friction between two surfaces?

• Making surfaces smoother

• Adding oil between surfaces

• Pressing surfaces together harder

• Reducing the weight on surfaces

If you double the mass of an object, what happens to its weight?

• It stays the same

• It doubles

• It is cut in half

• It becomes zero

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Which of the following best describes friction?

• A force that speeds up motion

• A force that opposes motion

• A force that pulls objects together

• A force that changes direction

What happens to an object’s speed if the force applied to it increases, assuming mass stays the same?

• Speed decreases

• Speed increases

• Speed stays the same

• Speed becomes zero

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Which of the following is an example of gravity in action?

• A magnet sticking to a refrigerator

• A ball falling off a table

• Rubbing your hands together to make them warm

• A boat floating on water

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If a car travels 100 meters in 20 seconds, what is its speed?

• 2 m/s

• 5 m/s

• 20 m/s

• 0.2 m/s

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A box is sliding across the floor and comes to a stop. Which force is mainly responsible for stopping the box?

• Gravity

• Friction

• Magnetism

• Air resistance