Use the Force… To discuss what forces can do for them.

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Presentation transcript:

Use the Force… To discuss what forces can do for them. A long time ago In a classroom far, far away, A group of future scientists gathered To discuss what forces can do for them.

Force is a Vector. It is drawn as an arrow. The length represents the magnitude. The arrow points in the direction of the vector.

Examples of ways to describe forces: Force is a Vector. Examples of ways to describe forces: 20 lbs to the right 115 N, 45 degrees south 35 N northeast 10 lbs 30 degrees below the horizontal.

Force, F, is a Vector. The effect a force has on an object depends on the force’s magnitude (size) and it’s direction.

Same magnitude, different direction = different force! Force, F, is a Vector. Same magnitude, different direction = different force! Start

Net Force Forces In the Same Directions Sara pulls the wagon with a force of 20 newtons (20 N) to the right. Tom pushes the wagon with a force of 30 newtons (30 N) to the right. What net force acts on the wagon?

Net Force Forces In Opposite Directions Red pushes blue with a force of 75 newtons (75 N) to the right. Blue pushes red with a force of 100 newtons (100 N) to the left. Which direction will the players move?

Net Force Forces In Different Directions – analytical solultion Two people pull on a boat with ropes. They pull at a right angle to each other. The one on the side pulls with 40 N of force. The one at the bow pulls with 30 N of force. Find the net force.

Net Force Forces In Different Directions – graphical solution Draw a scale diagram of the vectors. 1cm = 10 N Draw vectors “tip to tail”. Resultant is the vector connecting the start of the first to the end of the last. Measure the resultant (answer) with a ruler.