Forces and Motion Study Guide

Daylon's family just got a new puppy, and Daylon decided to take him for a walk. He put the puppy in a wagon and pulled the wagon down the sidewalk. From which of these reference points does the puppy appear to be moving?

• A. Daylon

• B. the wagon

• C. the sidewalk

• D. the puppy’s collar

Two school classes are playing tug-of-war with a rope. One class pulls on the rope with a 75 N force to the left, while the other pulls with a 40 N force to the right. Which two statements describe this situation?

• The forces are balanced, and the rope does not move.

• The forces are unbalanced, and the rope will move to the left.

• The net force on the rope is 115 N to the right.

• The net force on the rope is 35 N to the left.

Tags

NGSS.MS-PS2-2

You might have noticed that a feather falls slowly toward the ground, while a ball falls rapidly. Which statement correctly explains the motion of these objects?

• The ball does not experience fluid friction as it falls.

• Gravity is the only force acting on the feather and the ball.

• The acceleration of the ball and feather are the same.

• The feather experiences more fluid friction than the ball.

Tags

NGSS.MS-PS2-4

Nicki rides her bike at a constant speed for 6 km. That part of her ride takes her 1 hour. She then rides her bike at a constant speed for another 9 km. That part of her trip takes her 2 hours. What is her average speed?

• 3.00 km/h

• 5.00 km/h

• 5.25 km/h

• 7.50 km/h

Do you believe that you are pulled towards your science book, a bunch of grapes in your lunch, and your school building because of universal gravitation? Which two statements about universal gravitation are true?

• A. Gravity acts between you and each of these objects because all have mass.

• B. Gravity does not act between objects that are far apart, such as you and the sun.

• C. Gravity only pulls things in a downward direction, such as toward Earth's surface.

• D. Gravity acts between any two objects in the universe.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

David delivers meals to elderly people once a week. He uses a cart to move the meals. The cart has four smooth wheels. Which type of friction acts between the cart wheels and the sidewalk?

• sliding friction

• rolling friction

• fluid friction

• static friction

Andrew plays trumpet in the concert band. He holds the trumpet still at his side until it is time for him to play. When it is time, he brings the trumpet up to his mouth and starts to play. Which statement correctly connects the motion of the trumpet with Newton’s first law of motion?

• A. A tuba has more mass than a trumpet, so it has greater inertia.

• B. The trumpet automatically stops moving without a force acting on it.

• C. The trumpet starts moving because a net force overcomes the trumpet’s inertia.

• D. Andrew exerts an action force on the trumpet, and the trumpet exerts a reaction force on Andrew.

12. We learned about ONE contact force and THREE non-contact forces. Name and give an example of each force. USE COMPLETE SENTENCES! (4 pts)