True or false: forces and motion

Exercise and reference answers

Questions

1. Statement is true

   No

   Statement

   Internal forces can change a system's motion.

2. Statement is true

   Yes

   Statement

   A force always comes from another object.

3. Statement is true

   Yes

   Statement

   Astronauts in orbit are really in free-fall.

4. Statement is true

   No

   Statement

   A falling object on Earth is in perfect free-fall.

5. Statement is true

   No

   Statement

   Mass changes when you travel to the Moon.

Instructions

Tap True or False for each statement.

Explanation