Physical Science Unit 1 Preassessment

A box sliding down an inclined plane attains a velocity of 27 m/s in 3 seconds from rest.  Find the acceleration.

• 30 m/s

• 24 m/s²

• 9 m/s²

• 81 km/hr

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In a tug of war the left team pulls with a force of 200N. The right team pulls with a force of 150N. What is the resultant force?

• 50N to the left.

• 350N to the left.

• 350N to the right.

• 50N to the right.

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If the cars collide INELASTICALLY, how would they move afterward (if at all)?

• They would BOUNCE OFF and move LEFT

• They would STICK TOGETHER and move LEFT

• They would BOUNCE OFF and move RIGHT

• They would STICK TOGETHER and move RIGHT

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The definition of momentum is

• Mass in Motion

• The size of an object

• The velocity of an object

• A comparison between two objects

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What is the TOTAL MOMENTUM for the system BEFORE COLLISION?

• 14 kg m/s

• 24 kg m/s

• 10 kg m/s

• -24 kg m/s

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Collision where objects collide, and stick together.

• inelastic collision

• explosion

• elastic collision

• none of these

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What is the formula for Newton's second law of motion?

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DOK Level 1: Recall

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Which of the following best describes the principle of momentum conservation?

• Momentum is always lost in a collision.

• Momentum is conserved only when external forces act on the system.

• The total momentum of a system remains constant when no net external force acts on it.

• Momentum is the same as kinetic energy.

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DOK Level 1: Recall

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Design a simple device to minimize the force on an egg during a collision. Which of the following principles would be most important to consider?

• Increasing the mass of the egg

• Decreasing the time of impact

• Increasing the time of impact

• Decreasing the mass of the egg

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DOK Level 2: Skill/Concept

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Which of the following is a unit of force?

• Kilogram

• Meter per second squared

• Newton

• Joule

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