Poll Everywhere lets your audience respond using text messages (SMS), Twitter, or the web in real-time. The best part is you can embed live audience responses and live charts right inside your Microsoft PowerPoint presentation, free!

A large truck collides head-on with a small compact car. During the collision

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  • the track exerts a greater force on the car than the car exerts on the truck
  • the car exerts a greater force on the truck than the truck exerts on the car
  • neither exerts a force on the other, the car gets smashed simply because it gets in the way of the truck
  • the truck exerts a force on the car but the car does not exerts a force on the truck
  • the truck exerts the same amount of force on the car as the car exerts on the truck
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