combined forces

Combined Forces

What is meant by combined forces?

what is meant by balanced forces?

What is menat by un-balanced forces?

What happens when your car stops working ?

Are you going to push by yourself ?

Poll

What happens when your car stops working ?

• push it by yourself

• ask someone to push it with you

Adding foreces

• When two forces act on the same object and have the same direction , their strength can be added together 

  
  

Multiple Choice

What is meant by adding forces?

• two or more forces acting on the same object but in different dirrection

• two or more forces acting on the same object in the same direction

Multiple Choice

Which one of these is an example of adding forces?

Multiple Choice

If two people are pushing a car the first one has 100 N and the second one has 150 N , what is the net force?

• 250 N

• 50 N

Multiple Choice

When two forces act on an object in the same direction, How to calculate the net force?

• Addition

• Subtraction

Balanced forces 

Two forces of equal strength that combine to act on the same object but in opposite direction are balanced

What are the forces that act on a book in your hand? 

Your hand is pushing up 

Earth’s gravity is pulling down

Multiple Choice

What is meant by balanced forces?

• two forces equal in strength and with the same direction

• two forces equal in strength and with opposite direction

Multiple Choice

Which of the following is an example of balanced forces?

Unbalanced forces

Two forces of not equal strength that combine to act on the same object but in opposite direction are balanced

Net force   

The total of all forces acting on a body   

if they are opposite in direction we subtract

Net force

if they are in the same direction we add

Net force is zero

it is balanced force and it means the object will not move

500 N - 500 N = zero

Multiple Choice

calculate the net force

500 N to the left and 500 N to the right

• 500 N

• zero

Multiple Choice

calculate the net force

500 N to the left and 500 N to the left ?

• 500 N

• 1000 N

Multiple Choice

calculate the net force

500 N to the left and 300 N to the right ?

• 500 N

• 200 N

Multiple Choice

When two forces act on an object in the same direction, How to calculate the net force?

• Addition

• Subtraction