Programming 302

1. Which code block would cause an Actor to move up?

• {"func":"blockMotionPointDirection","values":[{"type":"string","value":"0"}],"next":{"func":"blockPhysicsApplyImpulse","values":[{"type":"number","value":"50"}]}}
• {"func":"blockMotionPointDirection","values":[{"type":"string","value":"90"}],"next":{"func":"blockPhysicsApplyImpulse","values":[{"type":"number","value":"50"}]}}
• {"func":"blockMotionPointDirection","values":[{"type":"string","value":"180"}],"next":{"func":"blockPhysicsApplyImpulse","values":[{"type":"number","value":"50"}]}}
• {"func":"blockMotionPointDirection","values":[{"type":"string","value":"-90"}],"next":{"func":"blockPhysicsApplyImpulse","values":[{"type":"number","value":"50"}]}}

2. What is the difference between an impulse and an Actor's velocity?

• An impulse acts on an Actor, while velocity is a property of an Actor
• An impulse is a property of an Actor, while velocity acts on an Actor
• Both an impulse and velocity act on an Actor
• Both an impulse and velocity are properties of an Actor

3. Which properties of an Actor would change if it was dropped from midair and started off with no x and y velocity? (Choose 2.)

• x linear velocity
• y linear velocity
• x position
• y position

4. Which direction would an Actor be moving after running this code block? {"func":"blockPhysicsSetLinearVelocityXY","values":[{"type":"number","value":"0"},{"type":"number","value":"-10"}]}

• The Actor would be moving up
• The Actor would be moving down
• The Actor would not be moving
• The Actor would be moving right

5. Which direction would an Actor be moving after running this code block? {"func":"blockPhysicsSetLinearVelocityXY","values":[{"type":"number","value":"10"},{"type":"number","value":"0"}]}

• The Actor would be moving up
• The Actor would be moving down
• The Actor would not be moving
• The Actor would be moving right

6. Which direction would an Actor be moving after running this code block? {"func":"blockPhysicsSetLinearVelocityXY","values":[{"type":"number","value":"10"},{"type":"number","value":"10"}]}

• The Actor would be moving down and to the right
• The Actor would be moving up and to the left
• The Actor would be moving straight up
• The Actor would not be moving

7. Which direction would an Actor be moving after running this code block? {"func":"blockPhysicsSetLinearVelocityXY","values":[{"type":"number","value":"0"},{"type":"number","value":"0"}]}

• The Actor would be moving up
• The Actor would be moving down
• The Actor would not be moving
• The Actor would be moving right

8. How can we reset an Actor's movement if it is moving out of control?

• {"func":"blockPhysicsSetLinearVelocity","values":[{"type":"number","value":"0"},{"type":"number","value":"0"}]}
• {"func":"blockPhysicsSetLinearVelocity","values":[{"type":"number","value":"50"},{"type":"number","value":"50"}]}
• {"func":"blockPhysicsApplyImpulse","values":[{"type":"number","value":"0"}]}
• {"func":"blockPhysicsApplyImpulse","values":[{"type":"number","value":"50"}]}

9. What happens if you set an Actor's restitution to 0? {"func":"blockPhysicsSetRestitution","values":[{"type":"number","value":"0"}]}

• The Actor wouldn't bounce very much at all
• The Actor would bounce a lot
• The Actor would be very hard to knock over
• The Actor would be very easy to knock over

10. What happens if you set an Actor's restitution to 10? {"func":"blockPhysicsSetRestitution","values":[{"type":"number","value":"10"}]}

• The Actor wouldn't bounce very much at all
• The Actor would bounce a lot
• The Actor would be very hard to knock over
• The Actor would be very easy to knock over

11. What happens if you set an Actor's density to 1? {"func":"blockPhysicsSetDensity","values":[{"type":"number","value":"1"}]}

• The Actor wouldn't bounce very much at all
• The Actor would bounce a lot
• The Actor would be very hard to knock over
• The Actor would be very easy to knock over

12. True or false: An Actor's X linear velocity determines how fast it is moving horizontally

• True
• False

13. True or false: Setting an Actor's linear velocity to 0 by 0 means it will stop moving. {"func":"blockPhysicsSetLinearVelocityXY","values":[{"type":"number","value":"0"},{"type":"number","value":"0"}]}

• True
• False

14. True or false: The denser an object, the harder it is to knock it over.

• True
• False

15. True or false: An Actor with no X linear velocity or Y linear velocity is not moving.

• True
• False