# PHYS 2211 Module 6.1

## Solving Problems with Newton’s Laws

6.1 Solving Problems with Newton’s Laws

### Learning Objectives

By the end of this section, you will be able to:

• Apply problem-solving techniques to solve for quantities in more complex systems of forces
• Use concepts from kinematics to solve problems using Newton’s laws of motion
• Solve more complex equilibrium problems
• Solve more complex acceleration problems
• Apply calculus to more advanced dynamics problems

### Tension Force

Discuss!

Consider how you would answer these questions. Then bring this to class for a group discussion.

Two blocks, A and B, are attached by a light string and rest on a smooth surface. The mass of A is 4 kg and the mass of B is 7 kg. Block A is pushed with a force of 12 N and block B is pulled with a force of 26 N.

(a) What is the net force for the entire system (A + B)?

(b) What is the acceleration for the entire system?

(c) What is the tension force in the string that connects the two blocks?

Practice!

Discuss!

Consider how you would answer these questions. Then bring this to class for a group discussion.

A 1-kg block is suspended by two ropes, as shown. The rope on the right makes an angle of 26° with the horizontal and pulls on the block with a 4-N tension force. The rope on the left makes an unknown angle of θ with the horizontal and pulls on the block with an unknown amount of tension. What is the force of tension in the left-hand rope?

Practice!

Practice!