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Semester 1 AP Physics

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Section 1

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The area under a velocity vs time graph is the displacement. (Be careful to always consider the zero line and whether the displacement is positive or negative.)

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Mar 1, 2020

Cards (33)

Section 1

(33 cards)

The area under a velocity vs time graph is the displacement. (Be careful to always consider the zero line and whether the displacement is positive or negative.)

Front

How do you find displacement from a velocity-time graph?

Back

They always oppose motion.

Front

Compared to an object's motion, in which direction does kinetic and air friction (drag) act?

Back

FIRST-INERTIA-Objects at rest stay at rest (A magician can pull a table cloth out from under dishes) and objects in motion stay in motion unless acted on by an unbalanced force. (A soccer ball rolling across the field will continue to roll in a straight line until someone kicks it (or rolling friction eventually stops it).) SECOND-F=MA. A force causes a mass to accelerate. If you push on a cart it will accelerate as long as you push on it with a force greater than friction. THIRD-ACTION REACTION-If object A pulls on object B then object B pulls on object A with an equal force in the opposite direction. "Push" can be substituted for "pull." Locker hits hand...

Front

What are Newton's three laws of motion? Give examples for each law of motion.

Back

The acceleration due to gravity on earth is -9.8 m/s². It is negative to show it is always down. This is important when dealing with problems where direction makes a difference.

Front

What is the acceleration due to gravity on Earth? What sign does it have? Why?

Back

The object is moving at an increasing speed in a forward (positive) direction. (Acceleration is also positive).

Front

Explain what each of the following velocity time graphs shows regarding an object's motion.

Back

The gravitational force quadruples

Front

How would the gravitational force change if the distance between the two objects is reduced to half?

Back

Mass.

Front

What determines the amount of inertia in an object?

Back

You stay in motion even though the cycle comes to rest. (1st Law)

Front

Explain why you keep moving forward if you crash your motorcycle into a guard rail.

Back

Vector quantities include direction like 15 m/s north. Sometimes a negative is used to indicate opposite directions. Examples include velocity, acceleration, force,....

Front

What are vector quantities? Give examples.

Back

The force of gravity is directly proportional to the product of the two masses and inversely proportional the the distance separating their centers squared.

Front

What does the law of universal gravitation state?

Back

The gravitational force would double

Front

How would the gravitational force change if the mass of one of the objects doubles?

Back

The net force is the sum of all the forces. (Direction must be considered when "adding" forces.) It is the magnitude and direction of the net force that determines the acceleration. The acceleration will be in the same direction as the net force.

Front

What is meant by the net force that acts on an object? Which way will the object accelerate?

Back

Static for objects not moving, kinetic when they are sliding and rolling for when they are rolling.

Front

What are the three types of surace friction? Define each.

Back

The gravitational force gets cut to 1/9

Front

How would the gravitational force change if the distance between the two objects is tripled?

Back

Yes, it cannot have a net force. Its velocity is not changing. Forces such as weight must have equal and opposite forces that create only balanced forces. Newton's 2nd Law is a law.

Front

Must an object moving in a straigh line at a constant speed have no net force acting on it?

Back

Scalar quantities have magnitude (a number) only. They do not include direction. Mass, time, speed, temperature, area, volume are a few.

Front

What are scalar quantities? Give examples.

Back

The gravitational force gets cut to 1/2

Front

How would the gravitational force change if the mass of one object doubles and the distance between the two objects doubles?

Back

The object is moving at a constant speed in a forward (positive) direction.

Front

Explain what each of the following velocity time graphs shows regarding an object's motion.

Back

If net force goes up, acceleration goes up.(direct relationship) If mass of object goes up acceleration of the object goes down. (inverse relationship)

Front

What happens to the acceleration of an object if a greater net force is applied? If the mass increases?

Back

The slope of a velocity vs time graph represents the acceleration.

Front

What does the slope of a velocity time graph represent?

Back

Object moving at a constant speed in a forward (positive) direction.

Front

What does the position time graph show regarding an object's motion?

Back

Speed is how fast but velocity is how fast AND in what direction.

Front

What is the difference between speed and velocity?

Back

The object is stopped.

Front

What does the position time graph show regarding an object's motion?

Back

Toward the center. Toward the center.

Front

For an object moving with constant circular motion, which direction does the centripetal force vector point? Which direction is the object's acceleration?

Back

The slope of a position vs time graph is the velocity.

Front

What does the slope of a position time graph represent?

Back

NO! All things fall at the same rate. (In real life air friction will affect lighter objects more because they have less inertia to "plow" through the air.)

Front

Ignoring air resistance, does a heavier object fall faster than a lighter object?

Back

The gravitational force gets cut to 1/4

Front

How would the gravitational force change if the distance between the two masses is doubled?

Back

Mass and weight are directly related. (Weight depends on gravity and thus changes with location. Mass is a measure of the amount of material (not to be confused with volume) and does not change with location.)

Front

What is the relationship between mass and weight?

Back

The gravitational force quadruples

Front

How would the gravitational force change if the masses of both objects double?

Back

The centrifugal effect is not a force in that nothing is pushing outward or causing the mass to accelerate away from the center. The feeling of going outward is a result of inertia. Because a body stays is the same straight line of motion it feels like it goes to the opposite side of the turn.

Front

Is centrifugal force a real force? Explain. Therefore, when you go around a sharp curve in a vehicle, what really causes you to be pushed toward the door?

Back

Static is > kinetic.

Front

Static friction is (<,=,>) kinetic (sliding) friction for two surfaces in contact.

Back

The source of the centripetal force is friction and this is lowered so the driver must slow down.

Front

What happens to the centripetal force of a vehicle moving through a curve when a road is icy? Tom make it safely through the curve, what must the driver do?

Back

The object is moving at a increasing speed in a forward (positive) direction. (Acceleration is also positive).

Front

What does the position time graph show regarding an object's motion?

Back