# ap physics 1 circular motion and gravitation free response

At the instant it is directly above the center of the circle it is making, its speed is. The string has negligible mass, and its length is. The tension and gravity both point down toward the center of the circle.

The net force on the ball is the vector sum of these two:. In this case, the force of gravity is helping the tension provide this force, so the tension is not as great as it would be if it were supplying the entire centripetal force.

What is the coefficient of friction if this is the fastest speed the car can take this turn? Is this the static or kinetic coefficient? For the car going around a flat turn, the force of friction is the only force keeping the car in a circular path.

Since the tires are rotating but not slipping on the surface, this is the coefficient of static friction,. On a wet road, the coefficient of static friction between a car's tires and the flat road is. When a car is going around a flat turn, the only force keeping the car going along a circular path is the force of friction, which is equal to the centripetal force. We do not need the mass of the car to calculate the maximum speed, as we will show below.

The radius of the curve can be calculated without knowing the mass of the car. The distance from your hand to the rope is. Determine the centripital force experience by the rock. The rock has a frequency of. Each circle it makes has a circumference of , which is equivalent to.

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Circular B Taught By. Paige K. Evans Clinical Associate Professor. In order to sweep out equal areas in equal times , a satellite must be moving faster when closest to the earth. See a clever animation. E is true; at all times during the orbital path, the velocity of the planet is tangent to the path. Since the path has a slightly elliptical nature to it, the force and acceleration vector are not necessarily perpendicular to this velocity vector.

The perpendicular orientation of the F and a vectors relative to the v vector is unique to circular motion. An excellent and informative graphic about this can be found online. F is false; see above explanation and the link to the informative graphic. G is false; the net force is a gravitational force. Gravitational forces vary inversely with distance. Thus, a planet will experience less force when furthest from the sun. You might really need to view the informative graphic. Explain how something can be moving at a constant speed yet be accelerating at the same time.

The object would have to be traveling in a curved path since it is accelerating. Acceleration is defined as a change in velocity over a change in time. If the speed is staying the same, then the velocity must be changing by altering the direction in which the object is heading. A force is required to do this. See an informative animation and further explanation. How did Newton come up with the idea that the moon is actually "falling" toward the Earth.

Newton made the connection between objects falling accelerating towards the earth and objects in space which are accelerating towards the earth while they are in circular motion around the earth. Both are being pulled by the earth due to the gravitational force. The moon stays in orbit due to it having the appropriate tangential velocity that keeps it from coming closer to the earth's surface.

The moon, however, is still accelerating at the rate any object would have at that distance from the earth. In a sense, the moon is falling around the earth rather than into the earth. True weightlessness occurs when there is an absence of gravitational force on an object. This is not a likely occurrence since every mass in the universe is attracted to every other mass in the universe with some force of gravity. All objects would experience some degree of gravitational attraction though it may be considerably small.

Apparent weightlessness is the sensation of not experiencing any external contact forces. This occurs when an object is in free-fall. Even though the object may have a large force on it, it wouldn't register on a scale that was in free-fall with it. Astronauts appear this way on the space shuttle.

Describe the apparent weight of a person in an elevator while upward, accelerating downward, and not accelerating. When one stands upright on a scale, the scale measures the force of the scale pushing upwards on the body.

As such, the scale does not measure one's true weight, but one's apparent weight. An elevator accelerating someone up must not only apply a force to provide the acceleration but also oppose the gravitational force on the person. Determine the strength of the gravitational field at a specified point outside a spherically symmetrical mass. Objects and systems have properties of inertial mass and gravitational mass that are experimentally verified to be the same and that satisfy conservation principles.

Essential Knowledge 1. Inertial mass is the property of an object or a system that determines how its motion changes when it interacts with other objects or systems. Learning Objective 1.

Gravitational mass is the property of an object or a system that determines the strength of the gravitational interaction with other objects, systems, or gravitational fields. The gravitational mass of an object determines the amount of force exerted on the object by a gravitational field. On the Earth, this gravitational force is called weight.

Gravitational field. Enduring Understanding 3. The gravitational force is always attractive. Why Does The Earth Spin? Created in by John Horwat. Inertial balance experiment Essential Knowledge 1. Essential Knowledge 2. Gravitational field Enduring Understanding 2. Learning Objective 2.