Unit 2: Newton's Law of Motion

When a soccer ball is kicked across a grass field, it begins moving rapidly and then slows and eventually stops moving. Which statement BEST describes why the ball slows down and stops?

• The ball starts with a lot of energy and then uses it all, making it stop.

• Friction from the grass acts in the opposite direction of the ball's motion.

• The ball slows and stops moving as soon as it runs out of acceleration.

• The field has a slope, so the ball slows down as it begins to roll uphill.

Tags

NGSS.MS-PS2-2

Analyze the forces acting on the bicycle. How will the motion of the bicyclist MOST LIKELY change?

• The bicyclist will continue moving forward at a greater speed.

• The bicyclist will continue moving forward at a constant speed.

• The bicyclist will continue moving forward at a slower speed.

Tags

NGSS.MS-PS2-2

A rock with a mass of 10.0 kg falls off a cliff. Gravity exerts a force of 98 N downward on the rock. What is the acceleration of the rock as it falls?

• 0.10 m/s²

• 9.8 m/s²

• 98 m/s²

• 980 m/s²

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Fill in the blanks to identify how Newton’s laws of motion apply to the situation described in the paragraph. Record your answers in the spaces provided. An airplane is stationary on the ground. The pilot starts the engines, which push air backward. As the engines push the air, this air pushes the plane forward, which is an example of Newton’s ______ law of motion. When the force applied by the engine is greater than the forces in the opposite direction, the plane accelerates as it moves on the runway, an application of Newton’s ______ law of motion. After the plane has reached sufficient velocity, the engines only need to apply enough force to balance the opposing forces. When the net force is zero, the plane continues moving forward at a constant speed, as described by Newton’s ______ law of motion.

• third, second, first

• first, second, third

• second, third, first

• first, third, second

Tags

NGSS.HS-PS2-1

The variables in the motion of an object have a force of 5.00 N and an acceleration of 15.00 m/s².

Based on Newton's Second Law of Motion, what value should the mass of the object be?

• 3.33 kg

• 75.0 kg

• 3.00 kg

• 0.333 kg

Tags

NGSS.MS-PS2-2

Newton’s laws of motion apply to any interaction in which one object exerts a force on another object. Which statement correctly describes how Newton’s third law of motion applies to the acceleration of a truck on a road surface?

• The truck moves faster because there is an unbalanced force.

• The truck continues to move forward after accelerating even though there is no longer a force pushing it forward.

• The tires of the truck exert a force on the road surface, and the road exerts an equal force on the tires.

• If the tires exert more force, the acceleration will increase, and the truck will move faster.

Tags

NGSS.HS-PS2-1

Students designed an experiment to demonstrate the force and acceleration of an object. This table shows the steps of their experimental design. Which of these statements does NOT correctly describe an application of Newton’s laws of motion to the experiment?

• The rolling of the ball across the table after the force is applied is described by the first law of motion.

• The ball bouncing on the floor is described by the third law of motion.

• The ball remaining stationary until it is pushed is described by the first law of motion.

• The change in speed as the ball falls is described as the third law of motion.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

Using Newton's second law of motion, explain why a bus requires a greater distance to come to a complete stop compared to a car traveling the same speed.

• A bus has more mass than a car, resulting in greater inertia.

• A bus has better brakes than a car.

• A bus travels faster than a car.

• A bus has less friction with the road than a car.

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NGSS.MS-PS2-2

A tennis ball, a soccer ball, and a bowling ball have the masses shown. If a net force of 10 N is applied to each ball, which statement accurately describes the balls' rates of acceleration?

• The acceleration will be the same for all three balls.

• The soccer ball will have the greatest acceleration.

• The bowling ball will have the greatest acceleration.

• The tennis ball will have the greatest acceleration.

Tags

NGSS.MS-PS2-2

Examine the image of the two batters hitting two different balls with their bats. If the baseball has a spin on it that pushes the air to the left, what does Newton's 3rd Law predict will happen to the motion of the baseball as a result?

• The ball will fall immediately to the ground.

• The ball will accelerate upward.

• The ball will curve to the left.

• The ball will curve to the right.

Tags

NGSS.MS-PS2-1