Semester 1 Exam Review

In the image, the arrows labeled WIND and WATER represent forces acting on a sailboat. The directions of the arrows represent the directions of the forces, and the lengths of the arrows represent the strengths of the forces. The force of the water on the sailboat is stronger than the force of the wind on the sailboat the entire time. Which statement describes the sailboat’s motion while these forces are acting? Assume that the sailboat does not stop or turn around.

• The sailboat’s speed will decrease.

• The sailboat’s speed will stay the same.

• The sailboat’s speed will increase.

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NGSS.MS-PS2-2

A ball is rolled along and off a table. Which of the following acts on the ball after it leaves the table but before it hits the

floor?

• Only the force the ball got from being rolled off the table.

• Both the force of the earth’s gravity on the ball and the force the ball got from being rolled off the table.

• Only the force of the earth’s gravity on the ball.

• Neither the force of the earth’s gravity on the ball nor the force the ball got from being rolled off the table.

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NGSS.MS-PS2-2

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What will happen to an object if a force that opposes its motion is greater than the force pushing or pulling it forward?

• The object will move slower and slower the entire time.

• The object will move at constant speed the entire time.

• The object will move at constant speed for a while and then slow down.

• The object will slow down for a while and then move at constant speed.

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NGSS.MS-PS2-2

Is it possible for an object to move at constant speed without a force pulling or pushing it?

• Yes

• No

Jennifer drove her bicycle to school. When did it have the most kinetic energy?

• When the bicycle's speed is 20 miles per hour.

• When the bicycle's speed is 10 miles per hour.

• When the bicycle's speed is 0 miles per hour.

• The bicycle's kinetic energy is the same the entire time.

• The bicycle doesn't have kinetic energy.

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Kinetic energy of an object depends on what variables?

• Mass

• Speed

• Mass and speed

• Mass, speed, and direction

• None of the above

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NGSS.MS-PS3-1

Does the Moon orbit Earth on the same orbital plane as the Earth Orbits the Sun?

• Yes

• No

What two variables can increase or decrease gravitational pull?

• size and velocity

• velocity and distance

• mass and direction

• mass and distance

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What would happen to the planets if gravity was suddenly turned off?

• They would shoot off in a straight line

• They would continue to orbit each other

• They would move in a random direction

• They would stop moving

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NGSS.MS-ESS1-2

A group of students made a simple electromagnet using a battery, a wire, and a nail. How could they increase the strength of the electromagnet?

• Increase the number of coils

• Decrease the number of coils

• Reverse the poles of the magnet

• Use a smaller battery

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