Force and Motion Review 24-25

Kevyn decided to take his little sister for a walk. He placed her in a wagon and pulled the wagon along the sidewalk.

From which of these reference points does his little sister appear to be moving?

• Kevyn

• the wagon

• the sidewalk

• her clothes

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 statement describes this situation?

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

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

• 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

Summer 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

Connor received a new puppy as a birthday gift. The puppy’s food bowl was placed on a mat to keep spilled food off the floor, but every morning the food bowl is sitting across the room. Which statement accounts for this situation?

• According to Newton's first law, the bowl has inertia.

• According to Newton's first law, the dog applied force to the bowl to move it.

• According to Newton's second law, an action force was applied to the bowl.

• According to Newton's third law, the bowl applied a reaction force to the puppy.

Ignacio bought a new dresser for his mother. He took it home and pushed it into place along the wall in her bedroom. She filled it with her clothes and decided she wanted it on another wall. Why was the dresser harder to move? Based on Newton’s second law, why does it become more difficult to move the dresser?

• With the clothes added, the dresser had more mass and more inertia.

• Ignacio had to apply less force to produce the same acceleration.

• Increased inertia means that less force is needed to move the Ignacio.

• If Ignacio used the same amount of force, the acceleration of moving dresser would be more after it was filled with clothes.

Tags

NGSS.MS-PS2-2

Which statement about universal gravitation are true?

• Gravity does not act between you and each of these objects if you have different masses.

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

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

• Gravity acts between any two objects in the universe.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

Which combinations of forces would best move a large, heavy box across a room?

Which statement is not correct for combining forces?

• Two people push on the box from the same side.

• Two people pull on the box from the same side.

• One person pushes on one side of the box, and one person pulls from the other side of the box.

• One person pushes on one side of the box, and one person pulls from the same side of the box.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which of the following objects will change speed the slowest when the same force is applied?

• a 8 kg bicycle

• a 1 kg toy truck

• a 20 kg wagon full of sand

• a 2 kg playground ball

Tags

NGSS.MS-PS2-2

Violeta ran a 400-m sprint at a track meet; her final time was 65 s. She reported that her velocity in the race was 6.15 m/s. Susan’s statement was inaccurate because she mentioned only (a)   . She did not include ​ (b)   , which is also a part of velocity. Choose the two words that will best fit in the blanks. Check all that apply.​

• slope
• speed
• acceleration

• direction

Which graph illustrates constant decreasing speed?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1