Force and Motion Chapter 1 Final

1. Three toy boats with the same mass were in a lake. Two boats were moving and one was stopped. Each boat got bumped by another boat, but not in the same direction. All the boats changed speed as a result of being bumped. Use the information in the diagram to answer.

Which toy boat(s) experienced the strongest force when it was bumped? How do you know?

• The blue toy boat experienced the strongest force because it takes a stronger force to slow something down than it takes to speed something up.

• The gray toy boat experienced the strongest force because it had the fastest ending speed.

• The orange and gray toy boats experienced the strongest forces because they both gained the same force as they sped up. The blue boat lost force, so it slowed down.

• All three toy boats experienced the same strength force because they changed speed by the same amount.

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2. Sandra pushed a wooden block and it slid across the floor. The wooden block gradually slowed down and stopped after moving 10 meters.

• The floor exerted a force that is opposite to the direction of the block’s motion.

• The block ran out of force.

• The floor absorbs force from the block.

• All objects stop moving because their natural state is to be still.

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At dinner, Hans passed the salt shaker to his sister Jessica by sliding it across the wooden table. The salt shaker gradually slowed down and stopped after moving 12 centimeters.

Why did the salt shaker stop moving?

• The salt shaker ran out of force.

• The table exerts a force that is opposite to the salt shaker's motion.

• The table absorbs force from the salt shaker.

• All objects stop moving because their natural state is to be still.

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A satellite was in two separate crashes. In both crashes, the satellite had the same mass. Engineers want to know about the speed and direction of the satellite after the crashes. Why would the crash affect the motion of the satellite, and which crash caused a greater change in motion for the satellite? (USE COMPLETE SENTENCES)

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In a warehouse, the workers sometimes slide boxes along the floor to move them. Two boxes were sliding toward each other and crashed. The crash caused both boxes to change speed. Based on the information in the diagram, which statement is correct? In your answer, explain what the forces were like and why the boxes changed speed.

Box 1 has more mass than Box 2.

Box 1 and Box 2 are the same mass.

Box 1 has less mass than Box 2.

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Which of the following is one of the five ways an object's motion can change:

• hit something

• bounce off something

• Speed Up

• fly off the table

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In order for an object to speed up, the direction of the force is:

• in any direction

• in the same direction as the object's motion

• in the opposite direction of the object's motion

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In order for an object to start moving, the force must come from

• the same direction as the object's motion

• the opposite direction as the object's motion

• any direction

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In order for an object to stop moving, the force must come from

• the same direction as the object's motion

• the opposite direction as the object's motion

• any direction.

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Which force caused the jar lid to travel faster and reach the end of the meter stick first?

• the weaker force

• the stronger force

• both forces had the same effect

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