Grade 4 Unit 5 Science Assessment

This picture shows DeAngelo using a pulley. How does the pulley affect the force Demario is using?

• The pulley decreases the speed of force.

• The pulley increases the amount of force.

• The pulley changes the direction of force.

• The pulley takes away the need of force.

Which simple machine could be used to hold two objects together?

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The picture shows Samuel moving a piano. The piano required too much force to move at first, but then Samuel added wheels to the legs and the piano was much easier to move.

How did adding wheels make the heavy piano easier to move?

• The wheels helped to increase the force of friction on the piano.

• The wheels helped to reduce the force of friction on the piano.

• The wheels helped to increase the total mass of the piano.

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Khari is cutting logs for a fire. Which type of simple machine will best help Khari?

• a pulley because it spreads the force outward to split the logs

• an inclined plane because it uses a better angle of force to split the logs

• a wedge because it changes the direction of force to split the logs

• a lever because it changes the amount of force needed to split the logs

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Which of these things does NOT happen due to the force of gravity?

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• a compass pointing north

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Which of these is true about the effect gravity has on objects?

• Plant roots fight against gravity to grow down.

• Gravity has the strongest pull at Earth's poles

• Gravity has a stronger force on metal objects.

• The force of gravity pulls all objects toward Earth.

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Jeremy has two toy trucks. His red truck has a higher mass than his blue truck. What will he have to do to make the two trucks go the same speed?

• He can push both trucks with the same force for the same period of time.

• He can push both trucks with the same force, but he will have to push the red truck for a longer time.

• He can push both trucks for the same amount of time, but he will have to push the red truck with more force.

• He can push both trucks for the same amount of time, but he will have to push the blue truck with more force.

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Cici weighs 50 pounds. Her sister Telissa weighs 80 pounds. They take turns pushing each other in a stroller. Which of the statements below is true?

• Telissa and Cici need to use the same force to push the other.

• Telissa will most likely not be able to move the stroller with Cici in it.

• Cici will need to use more force to push Telissa than Telissa will need to push Cici.

• Telissa will need to use more force to push Cici than Cici will need to push Telissa.

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