CA #3

Based on the free body diagram below, describe the motion of the box as a result of the net forces acting on the box.

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112.20.b.6.A

The thrust from a rocket's engine lifts the rocket into the air. Which of the following best explains why the engine's thrust lifts the rocket?

• For every action, there is an equal and opposite reaction. Forces occur in equal and opposite pairs.

• An object in motion tends to stay in motion; an object at rest tends to stay at rest.

• The greater an object's mass, the greater its resistance to changing it's motion.

• The greater the force applied to the an object, the greater the object's acceleration.

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112.20.b.6.C

Alex wants to test four bowling balls shown below. Each bowling ball is a different color and has a different mass. She throws the bowling ball all with the same net force of 20 Newtons. Order them from least to greatest acceleration. (1 being the least acceleration and 4 being the most)

• Red bowling ball

• Black bowling ball

• Blue bowling ball

• Green bowling ball

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112.20.b.6.C

Based on the information in the graph, which biker traveled the FASTEST?

• Biker 1

• Biker 2

• Biker 3

• Biker 4

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112.18.b.8.D

Two teams took part in a tug-of-war contest. The diagram below shows the force of Team 1's pull on the rope in Newtons. If team 2 wants to pull the flag to the right and win, which of the following forces could they apply to the rope to meet their goal?

• 100 Newtons

• 125 Newtons

• 150 Newtons

• 175 Newtons.

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112.20.b.6.A

Two students are working together to build a birdhouse. Student 1 applies a force of 10 Newton to a wooden board to slide is across the table to Student 2. If the force of friction resisting the student's push is 4N, what is the net force acting on the board?

PUT YOUR UNITS!

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112.20.b.6.A

Two bicycle riders have the same average speed and wind up in two different places. However, when these two bicycles riders have the same velocity, they wind up in the same place. How is this possible?

• Speed is a measure of distance traveled over a particular time period.

• Velocity includes not only speed but also the direction of the motion.

• Speed can change over the distance that is traveled by a moving object.

• Velocity cannot change as an object moves as a result of a force being applied.

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112.20.b.6.B

Match the following UNITS with what they measure.

• mass

• A pickup truck that is traveling East at a speed of 30 mph

• Velocity

• A truck that weighs 50 kg

• speed

• A pickup truck that is slowing down to turn around to do a u-turn.

• acceleration

• A pickup truck traveling at a speed of 15 m/s

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112.20.b.6.B

Which of the following best describes the velocity of an object moving?

• 45 m/s2

• 45 m West

• 45 m/s

• 45 m/s West

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112.20.b.6.B

Ms. Chambers graphed the position of a cart during a 7 second time interval. Which answer choice correctly describes the movement of the cart?

• The cart accelerated at a constant rate of approximately .8 m/s2

• The cart was stationary with a velocity of 0 m/s for the entire 7 seconds.

• The cart was stationary except for a short burst of acceleration of 0.5 m/s2

• The cart moved at constant velocity of 0.5 m/s for the entire 7 seconds.

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112.18.b.8.D