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Activity 76 Follow-up Is there a correlation between cart speed and block movement? Did the collision at different cart speeds last for different lengths of time? What variables were not measured or controlled?

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**Activity 76 Major Concepts**

As speed of an object increases, its force in a collision increases. When objects collide, forces are applied by, and to, each object involved in the collision. Force is required for any change of motion.

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**Title: Mass and Collisions**

Activity 77 Title: Mass and Collisions

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Read E-19 Problem: Does the mass of an object affect the force it applies during a collision? Hypothesis: If _________________, then _________________________.

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What is mass? How much matter is in something. Mass is in kilograms (kg) in the SI system. In activity 74, vehicle 1 is 2,027 kg (just over 2 tons) and vehicle 2 is 1,415 kg (just over 1.5 tons) WEIGHT is the force exerted by a mass as a result of GRAVITY. A rocket weighs less on the moon because the moon has less gravitational pull, but the mass is the same on the moon or on earth.

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**Will mass affect the speed of the cart?**

Released at the same height in a frictionless environment, the speed of the cart is the same regardless of its mass. The variable “speed” is eliminated from this activity. Variables which may affect speed which are out of our control may be the wobbling of the cart on the track or the friction variation on the axles in the carts.

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**Design an experiment You are not testing speed!**

What variables are involved? How will you test mass vs. force? Do you need to test different release heights? How many tested variables can you have? Use what you have learned from previous activities and discuss your design.

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Gravity The force of attraction between objects that is due to their masses.

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