DE_Phys_Unit2_Forces at a Distance

A positively charged spherical object is placed equidistant between two other identical uncharged spherical objects. How would the charges in the middle sphere be distributed?

The greater the magnitude of the two charges, the stronger the electric force.

Two charged particles Q1 and Q2 are at a distance R. Classify some of the following as either increase electric force, decrease electric force, or stay the same.

Two metal rods in a factory are oppositely charged and placed 8.9 cm apart. One rod has a charge of +7.5 x 10^-7 C and the other has a charge of -5.1 x 10^-5 C. What is the force between the rods? Is it an attractive or repulsive force?

Seamus is conducting an experiment on electric force. He wants to get an approximate idea of how much force the charges will generate. Reorganize each example to show the force of each situation in increasing order from lowest to highest (with repulsive forces being positive and attractive forces being negative).

Two students stand close to each other. Why do they not get pulled closer to each other due to the gravitational pull they exert on each other?

Each of the following statements describes some aspect of an unknown force. Determine whether each statement could possibly describe a gravitational force.

Why do astronauts in outer space feel like they are floating?

What is the equation for measuring Gravitational Force?

A 485 kg sphere sits at 14.0 km due north of an 852 kg sphere. What is the force of gravity on the first sphere due to the second sphere? Compare this to the force of gravity on the second sphere due to the first sphere.

Two 2.5 kg bowling balls are 0.50 m apart. What is the force of gravity on the first bowling ball due to the second? Compare this to the force of gravity on the second bowling ball due to the first.

What is the distance between two objects if one (a 185,000 kg object) experiences a gravitational force of 0.00200 N due to a 225,000 kg object.

Using the universal law of gravitation, solve for r if given two masses (122,000 kg and 225,000 kg) and a gravitational force between two of 0.00500 N.

Categorize the following items on whether they match with the center of mass or center of gravity.

What is the equation used to calculate the gravitational force of objects near the Earth's surface?

What is the force of gravity due to Earth on a 215 kg boulder on the Earth's surface?

Classify the following words into the following three categories: movement, position, body.

As Earth revolves around the Sun and rotates on its axis, the seasons change. When it tis summer in the Northern Hemisphere, it is winter in the Southern Hemisphere. Some think the distance from the Sun determines the seasons; however, summer in the Northern Hemisphere occurs when Earth is farthest from the Sun. How is this possible?

According to Kepler’s third law of planetary motion, the square of a planet's orbital period (defined as one year for Earth) is directly proportional to the cube of its average distance from the sun.

What is the simplified equation that represents this law of planetary motion?

Suppose an asteroid orbits the sun with a mean radius 11 times that of Earth. Use the simplified version of Kepler’s third law to find the period of the asteroid? Round your answer to the nearest Earth year.

We know that the orbital period of Haley's Comet is about 75 years. What is its mean radius from the sun as compared to Earth?

Which law of phenomenon explains each of the following facts? Drag each fact into the correct category.