Warm Up: Get Out Your Monkeys (HW)! Seatbelt Check! Why are seatbelts important? Describe in terms of the laws of motion.

- I can determine what combination of forces keeps an object going at a constant velocity. - So I can explain the difference between constant motion and acceleration in terms of forces. - I am successful when I can describe the combination of forces that keeps an object going at a constant velocity.

A LA CART For each situation (7 total):  Draw the table top, cart and the spring scale(s)  Indicate the amount of force exerted by the spring scales by writing the magnitude of the force above the drawing of the spring scale(s)  Write whether or not the object is moving at a constant velocity  If you decide that you do need to exert a force on the cart that you are using a spring scale, so that you can measure and record the magnitude of the force exerted (you are not pushing or pulling it with just your hand).  You and your group may decide that you will have to use more than one spring scale for some scenarios. Only use scales to apply horizontal forces (not hands, books, other people’s faces, etc)  Put your drawings, data and descriptions on a separate sheet of paper Drawings are for ONE INSTANT (not before or after the moment pictured) For each of your 7 trials, draw a FBD (Free body Diagram) of the situation, following the FBD guidelines covered in class.

A LA CART For each situation (7 total):  Draw the table top, cart and the spring scale(s)  Indicate the amount of force exerted by the spring scales by writing the magnitude of the force above the drawing of the spring scale(s)  Write whether or not the object is moving at a constant velocity SITUATION 1: The cart is sitting stationary on the table SITUATION 2: The cart is upside down (wheels off the table) and moving at a constant velocity to the left.

A LA CART For each situation (7 total):  Draw the table top, cart and the spring scale(s)  Indicate the amount of force exerted by the spring scales by writing the magnitude of the force above the drawing of the spring scale(s)  Write whether or not the object is moving at a constant velocity SITUATION 3: The cart is right side up (wheels on the table) moving at a constant velocity to the left SITUATION 4: The cart moves with a constant velocity to the left, wheels down. NO spring scale used.

CIRCLE UP WE need to talk!

A LA CART For each situation (7 total):  Draw the table top, cart and the spring scale(s)  Indicate the amount of force exerted by the spring scales by writing the magnitude of the force above the drawing of the spring scale(s)  Write whether or not the object is moving at a constant velocity SITUATION 5: The cart is stationary, wheels down, but there is at least one horizontal force exerted on it with a magnitude of 5 Newtons SITUATION 6: The cart is moving with a constant velocity, wheels down, and has a horizontal force of 5 Newtons pushing or pulling it to the left; no hands touching the cart. SITUATION 7: The cart is moving with a constant velocity, upside down, and has a horizontal force of 5 Newtons pushing or pulling to the left; no hands touching the cart.

THROWING UP A tennis ball is thrown straight upwards. Draw three FBDs of the ball during the 3 moments described: 1. While the ball is in the thrower’s hand during the upwards throw 2. When the ball is in the air, on its way to the top of its flight 3. When the ball is at the top of its flight

Describe the motion of each object 10 N 5 N 2 N 5 N 2 N 5 N 12 N 2 N 5 N 12 N 7 N 5 N 1) 4) 2) 3)