Forces and Motion Review

Multiple forces, such as gravity and friction, act on a ball when it rolls down a smooth slope. Which statement describes how friction affects the motion of the ball.

• Friction causes the ball to bounce.

• Friction causes the ball to increase in speed.

• Friction causes the ball to decrease in speed.

• Friction causes the ball to stop partway down the slope.

Which action involves a push?

• A paper airplane is thrown across a room.

• A ball slows down and stops in the grass.

• An orange falls from a branch to the ground.

• A rubber band is stretched around a stack of papers.

Tags

NGSS.MS-PS2-1

A girl pushed a bookcase along a wall and moved it 1 foot in 10 seconds. She asked a friend to help her move the bookcase. How does the combined force change the motion of the bookcase?

• The combined force will change the direction of motion of the bookcase.

• The combined force will create more friction and stop the bookcase from moving.

• The combined force will make the bookcase move the same distance, but more slowly.

• The combined force will make the bookcase move the same distance, but more quickly.

Tags

NGSS.MS-PS2-2

Sarah throws a ball to Billy, but it does not go far enough for him to catch it. What must Sarah apply to her next throw in order for it to reach Billy?

• Equal force

• Greater force

• Greater inertia

• Less acceleration

Tags

NGSS.MS-PS2-2

Katie and Mike were experimenting with two bowling balls. One of the bowling balls had a mass of 8 kilograms and the other had a mass of 5 kilograms. They compared the force needed to roll each of the balls at the same speed. They also compared how much force it took to stop the balls when the balls were rolling at the same speed. Which conclusion did the students most likely arrive at after experimenting with both bowling balls?

• Both bowling balls were equally hard to roll at the same speed, but the bowling ball with more mass was easier to stop.

• The bowling ball with the smaller mass was easier to roll and easier to stop than the bowling ball with more mass.

• The bowling ball with more mass was harder to roll but easier to stop than the bowling ball with the smaller mass.

• Both bowling balls were equally hard to roll at the same speed, but the bowling ball with the smaller mass was easier to stop.

Tags

NGSS.MS-PS2-2

Stephanie started pushing a bookcase across the room, as shown in picture 1. Then she removed the books and continued pushing with the same force and direction, as shown in picture 2. How does removing the books affect the motion of the bookcase?

• The mass is decreased, making the bookcase move faster.

• The gravity is increased, making the bookcase move slower.

• The friction is increased, making the bookcase move slower.

• The mechanical energy is decreased, making the bookcase move faster.

Tags

NGSS.MS-PS2-2

What is the amount of force, expressed in newtons (N), acting on the book from the right if the book is not moving?

• 5 N

• 10 N

• 15 N

• 20 N

Tags

NGSS.MS-PS2-2

The drawing below shows Rachel's game of tug of war with her friend Michael. To win the game, Rachel and Michael know that one of them must pull the other one over the center line. During this particular game, the rope is not moving. Which statement best explains why the rope is not moving?

• Rachel is applying more force in one direction.

• Michael is applying more force in one direction.

• Rachel and Michael are applying equal forces in the same direction.

• Rachel and Michael are applying equal forces in opposite directions.

Tags

NGSS.MS-PS2-2

Kim and Heidi are playing marbles. Kim rolls her marble toward the target, but it suddenly moves to the left and misses the target. Heidi looks at the ground and sees a small pebble where the marble was rolling. Which change did the pebble cause in the marble?

• The pebble caused the marble to speed up.

• The pebble caused the marble to bounce up.

• The pebble caused the marble to stop its motion.

• The pebble caused the marble to change direction

Tags

NGSS.MS-PS2-2

Which two measurements are needed in order to calculate the speed of a moving object?

• Height and mass

• Time traveled and mass

• Height and distance traveled

• Distance traveled and time traveled