Forces Mr. Krall.

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Presentation transcript:

Forces Mr. Krall

What is a force?

FORCE – Any push or pull on an object.

PUSHING FORCES

PUSHING FORCES

PUSHING FORCES

PUSHING FORCES

PUSHING FORCES

PULLING FORCES

PULLING FORCES

PULLING FORCES

PULLING FORCES

PULLING FORCES

Balanced forces – when all the forces on an object cancel each other and do not cause an object’s motion to change.

The rope will not move because the forces cancel each other out. Balanced forces + = + The rope will not move because the forces cancel each other out.

Unbalanced forces – When the forces on an object do not balance out and the object’s motion changes.

Unbalanced forces Hulk has more force than tree! The forces are unbalanced, so the tree’s movement changes.

Net force – the combination of all forces acting on an object

The box below has many forces acting on it. GRAVITY PULLING MAN PUSHING MINI-MAN PUSHING FLOOR PUSHING

If the size of the arrow shows the strength of the force… GRAVITY PULLING MAN PUSHING MINI-MAN PUSHING FLOOR PUSHING

What is the net force on the box? GRAVITY PULLING MAN PUSHING MINI-MAN PUSHING FLOOR PUSHING

The up and down forces are equal strength and opposite direction... GRAVITY PULLING MAN PUSHING MINI-MAN PUSHING FLOOR PUSHING

So they cancel each other out. GRAVITY PULLING MAN PUSHING MINI-MAN PUSHING FLOOR PUSHING

The two men are pushing in opposite directions… MAN PUSHING MINI-MAN PUSHING

but the red force is larger (stronger) than the green… MAN PUSHING MINI-MAN PUSHING Part of the red force will be used up cancelling the green…

The leftover red force is the net force on the box. MAN PUSHING If the net force is enough to overcome the box and mini-man’s inertia…

Then the box and mini-man will move in the direction of the net force.

Imagine we have two air jets,

The red jet blows air to the right.

The blue jet blows air up.

Let’s put a ping pong ball in the picture Let’s put a ping pong ball in the picture. Press “Go Red” to activate the red jet. GO RED

The ball went to the right because the red jet put a net force on the ball to the right. GO RED

Here’s our ball again. This time, press “Go Blue” to activate the blue jet. GO RED GO BLUE

If we blast the ball with both jets, what will happen? GO RED BOTH GO BLUE

Press “Both” to activate both jets. GO RED BOTH GO BLUE

The ball went diagonally because the net force is driving the ball up and to the right. GO RED BOTH GO BLUE