Unit B, Chapter 4,Lesson 5. Action and Reaction Newton’s third law states that when one object...
-
Upload
gervase-burns -
Category
Documents
-
view
228 -
download
1
Transcript of Unit B, Chapter 4,Lesson 5. Action and Reaction Newton’s third law states that when one object...
Action and Reaction
• Newton’s third law states that when one object exerts a force on another object, the second object exerts an equal force and moves in the opposite direction.– Example: A frog jumping off a Lilly pad.
• All forces come in pairs.– They are called action and reaction forces.– If you push down on your desk, or lean against a
wall, the desk and the wall push against you with an equal force.
• Forces must be balanced whenever an object is at rest.
Action and Reaction
• People who design rockets use Newton’s Third Law.
- For example, the gases that are in a rocket’s engine push backward and makes the rocket go up.
• When you walk it is also an example of action and reaction.
– When you push your foot on the ground the ground pushes back with equal force.
– Since you push your foot off the ground, it makes you move forward.
Newton’s Laws at the Amusement Park
• Motion, gravity, mass, forces, acceleration, friction, inertia, and reaction, are all important parts of amusement park rides.– An example of the first law is a roller coaster
and the swings. • If you didn’t have straps on a roller coaster you
would fall out and get seriously injured. • When the swings start moving in a circular
motion, you would fly out of your seat. It wouldn’t be pleasant!
Newton’s Laws at the Amusement Park
– Another example of the second law is hitting a target with enough force to make the bell ring. It tests your strength.
– An example of a ride using Newton’s third law is bumper cars. When they hit, they bounce backward with an equal force.
– Newton’s law can be displayed in all different rides. Next time your on a ride, think about what law might be demonstrated.