Inertia Homework 2: Tether Ball Discovery
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by Angela Peterson
| 9 Questions
Note from the author:
gravity & orbitals, planetary motion
1
1
Inertia is the tendency for an object to continue in a straight line motion at a constant speed unless acted upon by an unbalanced force (a force that can make a change). Inertia can also be an object staying at rest (speed = 0 m/s) unless an unbalanced force acts on the object.

When an unbalanced force acts on the tether ball, the ball can:
A. increase in speed
B. decrease in speed
C. increase or decrease in speed
2
1
Inertia is the tendency for an object to stay at a constant speed in a straight line motion. (or to remain at rest)
What is happening to the tether ball when the ball is caught by one of the players?
A . The tether ball continues to move in a straight line at a constant speed
B. The tether ball is pulled by the center pole making the ball go in a circular orbit
C. The tether ball decreases speed and stops
3
1
Inertia is the tendency for an object to stay at a constant speed in a straight line motion. (or to remain at rest)
What direction and speed would the tether ball go in the next moment if the player violated the rule yanking on chain and chain broke?
A. The tether ball continues to move in a straight line at a constant speed
B. The tether ball is pulled by the center pole making the ball go in a circular orbit
C. The tether ball decreases speed and stops
4
1
What would the hockey puck under the table represent in our solar system?
A . Sun
B. a planet
C. asteroids
5
1
What happens to the orbital speed as the hockey puck descends and the ball is closer to the center of the table?
A . Increases
B. Decreases
C. Stays the same
6
1
Why would the orbital speed increase? Does the pull/ force of the hockey puck become stronger or weaker the closer the ball comes towards the center? The pull or force becomes _____________________.
7
1
Isaac Newton found out that the strength of the pull of gravity weakens the farther you get away from an object, in proportion to y = 1/(r*r), where "y" is gravitational force and "r" is the distance you are away from the center or the radius. The strength of the gravitational pull is also proportional to the mass of the object. Type the equation for gravity here on this graph.
Tell your teacher what you noticed in this math relationship next time you see her.
8
1
Gravity is a force.
True
False
9
1
Gravitational attraction between two objects becomes greater the farther away that two objects are from one another.
True
False
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