1. Warm up 1. A 13 kg wagon is pulled is pulled with an 8 N force. The handle makes a 30 degree angle with the horizontal. What is the horizontal acceleration of the wagon? 2. When pulled by a rope at a 50 degree angle a 20 kg sled slides across a frictionless surface with an acceleration of 6 m/s2. What is the force pulling the sled?

2. homework P 151 1-4 P 169 2-4, 14, 15, 30, 31

3. Warm up Two wires make a 75 degree angle with each other. The wires are holding up a 60N street light. What is the tension in each wire?

4. How much force will be on each rope if two ropes support a mass at equal angles: Mass:200 g –Angles: 15, 30, 45, 60 degrees Mass 100 g –Angles: 15, 30, 45, 60 degrees

5. Inclined Plane Problems 1. Draw the situation 2. Find the Net force in the y direction (perpendicular to the surface)‏ 3. Find the Net force in the x direction (parallel to the surface of the plane)‏ 4. Find what the problem is asking for

6. A 4 kg block is on a frictionless plane which makes a 30 angle with the ground. What is the net force on the block?

7. ONE A 7 kg block is on an inclined plane which has a 15 degree slope. A. If there is no friction, what is the net force on the block? B. What is the block’s acceleration?

8. A 3 kg Wood block (μ k = 0.2) is on a wooden 2” x 4” tilted at a 50 degree angle. What is: A. The gravity force on the block? B. The friction force on the block? C. The Net Force on the block? D. The Acceleration of the block?

9. TWO An 11 kg wood Block is on a wooden ramp set at a 60 degree angle. What are: A. The gravity force on the block? B. The friction force on the block? C. The Net Force on the block? D. The Acceleration of the block?

10. What force is required to make a 25 kg steel block slide down a 45 degree teflon coated ramp with constant velocity?

11. Homework P 169 (5, 6, 18, 32, 36, 37)‏