Podcast
Questions and Answers
What is the SI unit of force?
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?
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 _____.
When an unbalanced force acts on an object, the object _____.
accelerates
What kind of friction occurs as a fish swims through water?
What kind of friction occurs as a fish swims through water?
As you push a cereal box across a tabletop, the sliding friction acting on the cereal box acts in the ______ direction.
As you push a cereal box across a tabletop, the sliding friction acting on the cereal box acts in the ______ direction.
What forces are acting on a falling leaf?
What forces are acting on a falling leaf?
An open parachute increases air resistance by increasing the _____ _____.
An open parachute increases air resistance by increasing the _____ _____.
The property of matter that resists changes in motion is called ______.
The property of matter that resists changes in motion is called ______.
An orange might roll off your cafeteria tray when you stop suddenly because of the orange's _____.
An orange might roll off your cafeteria tray when you stop suddenly because of the orange's _____.
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 _____.
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 _____.
If a force of 10 N is applied to an object with a mass of 2 kg, the object will accelerate at _____.
If a force of 10 N is applied to an object with a mass of 2 kg, the object will accelerate at _____.
Newton's third law of motion describes _____ and _____ forces.
Newton's third law of motion describes _____ and _____ forces.
The product of an object's mass and velocity is its ______.
The product of an object's mass and velocity is its ______.
What is the momentum of a 25 kg ice skater gliding across the ice at a speed of 5 m/s?
What is the momentum of a 25 kg ice skater gliding across the ice at a speed of 5 m/s?
The farther an astronaut travels away from Earth, her weight ______.
The farther an astronaut travels away from Earth, her weight ______.
The gravitational force between two objects increases as mass ______.
The gravitational force between two objects increases as mass ______.
A push or pull is an example of _____.
A push or pull is an example of _____.
The type of force measured by a grocery store spring scale is _____.
The type of force measured by a grocery store spring scale is _____.
The sum of all the forces acting on an object is called the _____.
The sum of all the forces acting on an object is called the _____.
If the forces acting on an object produce a net force of zero, the forces are called _____.
If the forces acting on an object produce a net force of zero, the forces are called _____.
The force that opposes the motion of objects that touch as they move past each other is called ______.
The force that opposes the motion of objects that touch as they move past each other is called ______.
The two forces acting on a falling object are gravity and ______.
The two forces acting on a falling object are gravity and ______.
The tendency of an object to resist any change in its motion is called _____.
The tendency of an object to resist any change in its motion is called _____.
The acceleration of an object is equal to the net _____ acting on the object divided by the object's _____.
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.
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