Section+7,+Chapter+1

Investigation:

Physics to go notes:

1. The direction of the force is an inward direction.

2. The name of the force that keeps something moving in a circle is centripetal force.

3. The name of the force that keeps a car on a circular path is friction.

4. A velocity can change because velocity is described as the speed something is moving in a certain direction. If an object changes directions, then it is accelerating, which is a change in velocity.

5. Three examples of acceleration are a car turning, a planet in orbit, or a solar system in orbit around the giant black hole in the center of the galaxy.

6. Gravity is the name of the force that keeps earth in orbit with the sun.

Investigation

4. A. 2 Pi

6. (Fell off at 1.56 amps)

A. It took 8.5 seconds at 1.56 amps for 10 revolutions

B. 51 revolutions

C. 1.14

7. Circumference= 188.4

A. 162.41 cm/s

B. 483.07 cm/s

8.

A. 1.35 amps at 4.4 volts, 47 revolutions in one minute, 1 revolution in 1.3 seconds, 8.97 seconds for 10 revolutions

B. 1.45 amps for sandpaper. 1.25 amps for rubber

C. The sandpaper and mat increase friction on the plate. The plane wood had up to 1.56 amps, the sand paper got 1.45 amps.

9.

A. The block fell off at a slower speed than it did on the inside of the circle.

B. 2.25 amps for 10 cm, 2.1 at 20 cm, 2.02 amps at 30cm.

Physics to Go

1-2

3.



5. One example is a car going around a tight turn, and when it turns, the friction from the tires keeps the car turning. Another example would be a spiral galaxy, with a massive object in the center of it, which has massive gravitational fields, keeping star systems spinning around it.

6. If you take a turn at 20 m/s turn around a 20 foot bend, it would be safe, while if it is at the same velocity, around a 10 foot bend, then it would be unsafe. This is because per foot turned, there is less velocity than the 10 foot bend.