Topic 6- Forces and Changes in Motion

John is curious about the speed of a car traveling from Los Angeles to San Francisco. After noting down the time (in hours) it took to reach San Francisco, what other measurement does John need to calculate the car's average speed?

• weight

• distance

• time

• capacity

A heavy book is placed on the edge of a table. Even though the book is quite weighty, a slight nudge makes it fall off the table. How can a minor force cause a large object to fall?

• The direction of the force is crucial to move an object, not the magnitude of the force.

• The nudge on the book increased the friction, causing the book to fall.

• The slight nudge balanced the forces that were holding the book in place, causing it to fall.

• The forces on the book were balanced, and a minor additional force caused them to be unbalanced.

Tags

NGSS.MS-PS2-2

Which of the following materials is magnetic?

• metal paperclip

• Plastic fork

• Rubberband

• wooden spoon

Tags

NGSS.MS-PS2-3

Emma is studying the concept of motion in her science class. She learns about the movement of various objects like birds, humans, trains, and rockets. Which of the following statements could Emma use to define motion in her class presentation?

• All objects in motion are constantly accelerating.

• Motion is unaffected by gravitational forces.

• Motion refers to the change in an object's position over time.

• Objects in motion invariably alter their path.

In her science class, Riley conducted an experiment using the tool shown in the image. She gently tugged on the spring scale, which indicated a force, but the block remained stationary. What could be the reason for the block not moving despite Riley's pull on the scale?

• The force she exerted was balanced by another force.

• The string connecting the spring scale and the block was not robust enough.

• The spring scale was malfunctioning, hence no force was applied when she tugged on it.

• There was insufficient friction between the block and the surface of the table.

Tags

NGSS.MS-PS2-2

When Adrian pulls a toy train with a string, which force is NOT involved in this action?

• Pulling force from her hand

• Friction between the train wheels and the surface

• Gravitational force acting on the train

• Magnetic force from the Earth's core

Tags

NGSS.3-PS2-1

Fen started pulling a heavy box across the room. Later, he removed some items from the box and continued pulling with the same force. How does removing the items affect the motion of the box?

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

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

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

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

Tags

NGSS.MS-PS2-2

When a force is applied to an object, it can be measured in Newtons (N). If two forces of unequal magnitude are applied to an object in opposite directions, they are said to be unbalanced forces. How might unbalanced forces affect the motion of an object?

• The object will continue to move at the same rate and in the same direction.

• The object will change its speed or direction.

• The object will continue at the same rate, but change directions.

• The object will slow down and then stop completely.

Tags

NGSS.MS-PS2-2

Caleb goes to the park to play basketball. He walks straight for a while, then turns right. He stops at a traffic light, then crosses the road. He walks another 100 yards to the park. Which of the following about Caleb's walk to the park is true?

• He changes both position and direction on his walk.

• He does not change his direction, but changes position.

• He does not change his position, but changes direction.

• He walks at a constant speed from his house to the park.

Mrs. Cocio's science class is conducting an experiment to see which toy car would travel the furthest distance. The toy cars are identical in every way . The students applied a different force on each car and then measured the distance it traveled. Based on the data below, whose toy car was pushed with the greatest amount of force?

Emily's toy car- 3 meters

Jack's toy car- 5 meters

Olivia's toy car- 6 meters

Max's toy car- 4 meters

• Emily's car

• Jack's car

• Olivia's car

• Max's car

Tags

NGSS.3-PS2-1