Unit 4 Review

How will the force of the rubber band affect the cars?

• Car 3 will travel the longest distance.

• Car 1 will travel the shortest distance.

• Car 1 will be the least affected by the force acting upon it.

• Car 3 will be the least affected by the force acting upon it.

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What is the force that causes the reading on the spring scale shown in the illustration?

• friction

• gravity

• mass

• weight

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Two racecars with the same mass started moving on a race track at the same time. One car reached the finish line of the track in 15 sec, and the other reached the finish line in 20 sec. Why did the cars take different amounts of time to reach the finish line?

• The force of gravity slowed one car but not the other car.

• The slower car did not experience any force, so it moved more slowly.

• The forces on one car were balanced and on the other car unbalanced.

• The engine of the faster car exerted more force than the engine of the other car.

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This spring scale is measuring the force on a block hanging from the hook.<\/p>

What would be the reading on the scale if an identical second block were added to the hook?<\/p>

• 2.2 N<\/p>

• 2.2 g<\/p>

• 4.4 N<\/p>

• 4.4 g<\/p>

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When you coast down a hill on a scooter, you move faster and faster. If you continue moving onto a level surface, finally you will stop moving. Which of Newton’s laws of motion explains why you stop?

• Newton’s first law explains that when you reach the bottom of the hill, you run out of energy, so you stop moving.

• Newton’s first law explains that gravity affects you when you move downhill, but not when you move on a level surface.

• Newton’s second law explains that no force acts on your scooter on the level surface, so it stops moving.

• Newton’s third law explains that friction between the tires and the ground is an unbalanced force that changes your motion.

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Ryan bends a plastic ruler backward and then releases it to hit a button. Force from the ruler causes the button to slide across a table. Ryan bends the ruler back 4 cm for starting point one, 6 cm for starting point two, and 8 cm for starting point three. What are the most likely results of Ryan’s experiment?

• starting point one = 16 cm, starting point two = 26 cm, starting point three = 36 cm

• starting point one = 36 cm, starting point two = 26 cm, starting point three = 16 cm

• starting point one = 16 cm, starting point two = 16 cm, starting point three = 16 cm

• starting point one = 36 cm, starting point two = 26 cm, starting point three = 0 cm

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The following table shows the masses of four different wooden blocks and the forces that are affecting them. According to Newton’s laws of motion, which block will have the greatest motion?

• red

• blue

• green

• yellow

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Which question best describes the subject of Newton’s first law of motion?

• Why do objects fall naturally toward Earth?

• Is there any difference between a push and a pull?

• What happens to an object when it leaves Earth’s atmosphere?

• What makes an object start moving or change the way it is moving?

What two factors affect the gravitational force between two objects?

• force and size

• size and distance

• mass and distance

• mass and force

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Katie sits on the ground and rests her hands on a bowling ball in front of her. She uses all her force to push the bowling ball away from her body. Next, Katie rests her hands on a soccer ball situated in front of her at the same location. She uses all her force to push the soccer ball away from her body. How does the movement of the two balls contrast?

• The soccer ball moves a greater distance because more force is acting on it.

• The soccer ball moves a greater distance because it has less mass.

• The bowling ball moves a greater distance because it has more mass.

• The bowling ball moves a shorter distance because less force is acting on it.

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