Roelfs Force and Motion Test

A bakery delivery van is transporting a wedding cake across town to the location of a wedding reception. Which of Newton’s laws BEST explains why the driver of the van would want to be extra careful when making stops and turns along the route?

• Law of Action-Reaction

• Law of Force and Acceleration

• Law of Inertia

• Law of Conservation of Matter

A skater pushes off a wall and skates backward for a few meters before stopping. Which statement best describes an action-reaction force pair in this situation?

• The wall pushes on the skater when the skater pushes on the wall.

• The wheels slow down, and the skater stops.

• The skater exerts a force on the wall, and the wheels exert a force on the floor.

• The friction of the floor decreases when the wheels roll on the floor.

Tags

NGSS.MS-PS2-1

The diagram shows a duck swimming in a stream in the opposite direction the stream is flowing. The duck pushes against the water, so the water pushes the duck forward with 20 Newtons of force. The water exerts 15 Newtons of resistant force against the duck. Which statement best describes the resulting motion of the duck?

• The duck will stop moving.

• The duck will stop and then start moving again.

• The duck will continue moving in its current direction.

• The duck will move in the direction that the stream is flowing.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A roller coaster containing three cars is accelerating at 10 m/s before it comes to an abrupt stop at the end of the ride. The mass of each car is 300 kg. How much force was exerted on the roller coaster to bring it to a stop?

• 30 N

• 900 N

• 3000 N

• 9000 N

Tags

NGSS.MS-PS2-2

A mother and daughter press their hands together and then push apart while ice skating. Immediately after they push away from each other, how does the motion of the mother and daughter change?

• The mother moves forward, and the daughter moves backward with a greater acceleration.

• Both move forward, but the mother moves with a greater acceleration.

• The mother moves backward, and the daughter moves forward with a greater acceleration.

• Both move backward, but the daughter moves with a greater acceleration since she has less mass.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A block is pulled 0.90 m to the right in 2.5 s. What is the block's average speed to the nearest hundredth of a m/s?

• 2.25 m/s

• 2.77 m/s

• .36 m/s

• .036 m/s

Tags

NGSS.MS-PS3-1

A group of four students is participating in a marble race. Each marble has a different mass and the same force is applied to each marble. The data of each marble is shown in the table above. Which law best describes this experiment?

• Law of Inertia

• Law of Force and Acceleration

• Law of Action-Reaction

• Law of Conservation of Matter

Tags

NGSS.MS-PS2-2

A bus travels 20 km in 30 minutes. What is the average speed of the bus in km/hr?

• 20 km/hr

• 30 km/hr

• 40 km/hr

• 50 km/hr

A student sets a 0.4 kilogram (kg) soccer ball on the ground and gives it a hard kick. The ball traveled a distance of 37 meters (m). The acceleration of the ball was 2,550 meters per second squared (m/s²).

 

Based on the data, how much force in newtons (N) did the student apply to the ball?

• 14.8 N

• 68.9 N

• 1,020.0 N

• 6,375.0 N

Tags

NGSS.MS-PS2-2

What is the net force and direction of the force for the diagram?

• 120 left

• 100 left

• 20 left

• 30 right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2