Download presentation

Presentation is loading. Please wait.

Published byDale Wingett Modified over 2 years ago

1
Chapter 11.3 Pages 380 - 385

2
Any action that can change the state of motion of an object

3
1. Force of gravity – example: Earth’s pull on all objects on it. 2. Electromagnetic force – example: force produced by electricity 3. Strong nuclear force – force that keeps protons in the nucleus together 4. Weak nuclear force – observed during radioactive decay

4
Total Force on an object

5
If forces act in the same direction on an object, you need to add the forces. If forces act in opposite directions on an object, you need to subtract the forces.

6
Forces are balanced if the net force is equal to zero. The object must be at rest or moving at a constant velocity.

7
Forces are unbalanced if the net force is not zero. The object must be accelerating.

8
1. Barry pushes a desk to the right with a force of 250 N as Jenna helps him push it to the right with a force of 325 N. What is the net force on the desk? In what direction? Are the forces balanced or unbalanced? Is the desk accelerating? Answer: 250 N + 325 N = 575 N to the right The forces are unbalanced The desk is accelerating

9
2.Carrie pulls a book east towards her with a force of 65 N while Martha pulls the book west towards her with a force of 55 N. What is the net force on the book? In what direction? Are the forces balanced or unbalanced? Is the book accelerating? Answer: 65 N - 55 N = 10 N to the east The forces are unbalanced The book is accelerating

10
3.Kathy and Beth are arguing where their sofa should go. Kathy pushes the sofa to the right with a force of 175 N while Beth pushes it to the left with a force of 175 N. What is the net force on the desk? In what direction? Are the forces balanced or unbalanced? Is the desk accelerating? Answer: 175 N - 175 N = 0 N, no direction The forces are balanced The desk is not accelerating

11
4.Two students pushes a heavy crate each with a force of 225 N north while one student pushes it south with a force of 300 N. What is the net force on the crate? In what direction? Are the forces balanced or unbalanced? Is the crate accelerating? Answer: (225 N x 2) – 300 N 450 N – 300 N = 150 N, north The forces are unbalanced The crate is accelerating

12
5.The force of gravity is pulling a pail of water downward with a force of 50 N while a rope is holding it up with a force of 50 N. What is the net force on the pail? In what direction? Are the forces balanced or unbalanced? Is the pail accelerating? Answer: 50 N – 50 N = 0 N, no direction The forces are balanced The crate is not accelerating

Similar presentations

Presentation is loading. Please wait....

OK

Forces Force – any push or pull acting on an object

Forces Force – any push or pull acting on an object

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on partnership act 1932 Ppt on group development theories Ppt on information communication technology Procure to pay ppt online Ppt on tata trucks india Ppt on preservation of public property records Ppt on relations and functions for class 11th accounts Ppt on work power and energy class 11 Ppt on taj mahal tea Simple ppt on wifi technology