Relationship Between Force & Motion 7.7 ABCD

Speed is defined as ____________/ time

• acceleration

• displacement

• distance

• force

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7.7A

Over the course of an hour, a car travels 50 km to the west, turns around, and travels 25km to the east. What is the car's average velocity?

• 25 km/h west

• 25 km/h east

• 50 km/h west

• 75 km/h west

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7.7B

The workout times of three swimmers were recorded below. Which swimmer had the workout represented by the graph?

• Swimmer 1

• Swimmer 2

• Swimmer 3

• None of the above

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7.7C

The driver of a car accidentally leaves his briefcase on top of the car and prepares to leave for work. Because the car accelerated slowly, the briefcase did not move initially and is now moving with the car. According to Newton's first law of motion, what will happen if the car comes to a sudden stop?

• The briefcase will continue moving forward and slide off the front of the car.

• The briefcase will remain in place because the forces acting upon it are balanced.

• Friction will keep the briefcase in place, even while the car comes to a stop.

• It is impossible to predict what will happen without knowing the mass of the briefcase.

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7.7D

A group of students were investigating how changing the steepness of an incline could affect the speed that a marble would travel through a tube. Using the information on the image, what was the marble's speed?

• 0.5 m/s

• 0.7 m/s

• 1.0 m/s

• 1.4 m/s

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7.7A

Which is a measurement of velocity?

• 20 m/s

• 20 m/s²

• 20 m/s north

• 20 N ⋅ m

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7.7B

​ ​ ​ The graph shows the distance three BMX bikes traveled over time. Use the descriptions of the bike's motion to match them to the correct biker. ​

• stopped for minutes

• Biker 3

• took 10 minutes to travel 10 miles

• Biker 1

• moved at a constant speed

• Biker 2

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7.7C

A person pushes a box with an unknown force and it begins to move. If the force of friction is 2N, what can you infer about the force applied by the person?

• The force applied is greater than 2N.

• The force applied is less than 2N.

• More information is needed to make an inference about the force applied.

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7.7D

Which has the greatest average speed?

• a boat sailing 80 km in 2 hours

• a car driving 90 km in 3 hours

• a train traveling 120 km in 3 hours

• a truck moving 50 km in 1 hour

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7.7A

Two identical balls are dropped at the exact same time. One ball is released so that it can drop straight down; it has a horizontal velocity of 0 m/s. The other ball is thrown horizontally and has an initial horizontal velocity of 10 m/s. Assume no air resistance. Select the statements that correctly describe the movement of the balls.

• The first ball will hit the ground before the second ball.

• The forces acting on both balls are balanced.

• The balls will hit the ground at the same time.

• The forces acting on the first ball are balanced, but the forces acting on the second ball are unbalanced.

• The only force acting on the balls is the force of gravity, pulling them downward.

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7.7B