Questions and Answers
What is the SI unit of force?
Newton
What is the net force that results when a pair of balanced forces acts on an object?
Zero
When an unbalanced force acts on an object, the object _____.
accelerates
What kind of friction occurs as a fish swims through water?
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As you push a cereal box across a tabletop, the sliding friction acting on the cereal box acts in the ______ direction.
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What forces are acting on a falling leaf?
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An open parachute increases air resistance by increasing the _____ _____.
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The property of matter that resists changes in motion is called ______.
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An orange might roll off your cafeteria tray when you stop suddenly because of the orange's _____.
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According to Newton's second law of motion, the acceleration of an object equals the net force acting on the object divided by the object's _____.
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If a force of 10 N is applied to an object with a mass of 2 kg, the object will accelerate at _____.
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Newton's third law of motion describes _____ and _____ forces.
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The product of an object's mass and velocity is its ______.
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What is the momentum of a 25 kg ice skater gliding across the ice at a speed of 5 m/s?
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The farther an astronaut travels away from Earth, her weight ______.
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The gravitational force between two objects increases as mass ______.
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A push or pull is an example of _____.
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The type of force measured by a grocery store spring scale is _____.
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The sum of all the forces acting on an object is called the _____.
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If the forces acting on an object produce a net force of zero, the forces are called _____.
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The force that opposes the motion of objects that touch as they move past each other is called ______.
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The two forces acting on a falling object are gravity and ______.
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The tendency of an object to resist any change in its motion is called _____.
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The acceleration of an object is equal to the net _____ acting on the object divided by the object's _____.
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Study Notes
Forces and Motion Essentials
- SI unit of force is the Newton.
- Balanced forces acting on an object result in a net force of zero.
- An object accelerates when acted upon by an unbalanced force.
- Fluid friction occurs as a fish swims through water.
- Sliding friction acts opposite to the direction of motion when pushing an object.
- Forces acting on a falling leaf include gravity and air resistance.
- An open parachute increases air resistance by enlarging its surface area.
- The property that resists changes in motion is called inertia.
- An orange rolls off a tray during sudden stops due to its inertia.
Newton's Laws of Motion
- Newton's second law states that acceleration equals net force divided by inertia (mass).
- If a force of 10 N is applied to a 2 kg object, it will accelerate at 5 m/s².
- Newton's third law describes action and reaction forces.
Momentum and Gravity
- Momentum is the product of an object's mass and velocity.
- A 25 kg ice skater moving at 5 m/s has a momentum of 125 kg·m/s.
- An astronaut's weight decreases as they travel farther from Earth.
- The gravitational force between two objects increases with an increase in mass.
Force and Friction Concepts
- A force is defined as a push or pull.
- Weight, measured by a grocery store scale, is due to gravity.
- The net force is the total of all forces acting on an object.
- Forces yielding a net force of zero are classified as balanced forces.
- Friction is the force opposing the motion of objects that are in contact.
- The main forces on a falling object include gravity and air resistance.
- Inertia is the tendency of an object to resist changes in its motion.
Studying That Suits You
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Description
Test your knowledge of forces and motion with this chapter 12 review quiz. Each flashcard covers key concepts such as the SI unit of force, balanced and unbalanced forces, and types of friction. Perfect for students preparing for exams or seeking to reinforce their understanding.
