Physics 5th 6 weeks test review

Rank the kinetic energy at the four positions marked on the image which represents a roller coaster car at various positions on the track.

• A) A > B > C > D

• B) B > C > A > D

• C) D > A > C > B

• D) D > C > B > A

Why is the first stage of a large roller coaster (which usually takes the riders up a large incline) assisted by a chain under the roller coaster carts?

• F) To build suspense, there is no scientific reason.

• G) To build kinetic energy since the ride is starting from rest.

• H) To build potential energy which will be turned into kinetic energy throughout the majority of the ride.

• J) To build elastic potential energy which will be transformed throughout the ride.

The relationship between Potential Energy and Kinetic Energy can be described as which of the following?

• linear

• inverse

• parabolic

• rational

Which of the following is the best example of kinetic energy being transformed into potential energy?

• winding a grandfather clock

• bending a paper clip

• coasting down hill on a bicycle

• starting an automobile engine

The drawing below represents a roller coaster car at various positions on the track. At which of these positions on the track did the roller coaster have the most potential energy?

• A

• B

• C

• D

The drawing below represents a roller coaster car at different positions on a track. At which of these positions on the track was the potential energy being transformed into kinetic energy for the roller coaster car?

• A

• B

• C

• D

A spring does 5.0 J of work on a 0.10-kg ball bearing in a pinball machine. The ball's resulting speed just after leaving the spring is —

• 5 m/s

• 1 m/s

• 5 m/s

• 10 m/s

A blacksmith swings a 3.0-kg hammer at 1.5 m/s. He hits a 25.0-kg anvil and the hammer bounces up 0.08 m. The energy change for the hammer was —

• 1.0 J

• 2.4 J

• 3.4 J

• 4.5 J

Which of the following best explains the greater difficulty in stopping a 1000-kg car moving at 174 km/h compared to an identical 1000-kg car moving at 100 km/h?

• The faster car has less air drag.

• The faster car has greater momentum.

• The slower car has less tire friction.

• The slower car has greater inertial mass.

A dart with a mass of 50 g is thrown at 15 m/s and sticks into a 100-g apple hanging on a string. What is the velocity of the dart and apple just after the dart is embedded?

• 0 m/s

• 5 m/s

• 10 m/s

• 15 m/s