Force and Motion Pre-Snapshot

1. Gravity and magnetism are alike because they–

• are both noncontact forces that act on objects from a distance to affect their motion.
• are both contact forces that only act by touching an object.
• oppose each other and sometimes balance each other out.
• work in different directions by touching an object to affect its motion.

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NGSS.MS-PS2-4

NGSS.MS-PS2-5

2. Friction is a force that–

• opposes the force of gravity to stop motion.
• does not have to be in contact with an object to be at work.
• works as it contacts an object and opposes its motion.
• will always bring an object to a complete stop because it opposes all motion

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NGSS.MS-PS2-2

3. How would you describe the forces at work on the vase below?

• The force of gravity is stronger than the normal force.
• The normal force is stronger than the force of gravity.
• There are no forces acting on the vase because it is at rest. Forces are only at work if an object is moving.
• The force of gravity is pulling down on the vase, but it is balanced by the normal force pushing upward. The object is at rest because the forces are balanced.

4. Which of the following best describes the force of magnetism?

• A noncontact force that can either attract or repel objects
• A force that is applied to an object by another object or a person
• A force that is exerted on an object that is in contact with another object
• A force that is exerted on an object as another object tries to slide across it

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

5. Which of the following is true about forces, especially applied forces?

• They always change the pattern of an object’s motion by making it accelerate.
• They can be either equal or unequal and can cause changes in the pattern of an object’s motion.
• They are always opposed by an equal force.
• They can be equal or unequal depending on how much friction they encounter.

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NGSS.MS-PS2-2

6. Which of the following actions would NOT make the wagon move horizontally or vertically?

• Pull on the wagon handle.
• Push on the wagon from the right.
• Sit in the wagon.
• Roll the wagon down a hill.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

7. Using this diagram, how would you calculate net force to determine the strength of the missing force if the horizontal forces are balanced?

• Add 8 and 21, and then add 11.
• Add 11 and 21, and then subtract 8.
• Add 8 and 11, and then add 21.
• Subtract 8 from 21, and then subtract 11.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

8. In this image, if the large rock is rolling down the hill, what must be true?

• Only the horizontal forces are balanced with a net force of zero.
• Only the vertical forces are unbalanced with a net force of zero.
• The forces must be balanced with a net force of zero.
• The forces must be unbalanced with a net force that does not equal zero.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

9. This person is parachuting toward the ground at a constant speed. Describe the net force that is acting on this person.

• The force of gravity must be acting with a strength of 300 N, making the forces balanced.
• The force of gravity must be <300 N, making the vertical forces unbalanced.
• The force of gravity must be >300 N, making the vertical forces unbalanced.
• The force of gravity must act with a strength of 0 N, making the vertical forces balanced.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

10. Two children are playing with a toy car. What is the net force? Which statement is true?

• 0 N; the toy car is moving at a constant speed.
• 10 N; the toy car is accelerating to the right.
• 0 N; the toy car is either at rest or moving at a constant speed.
• 10 N; the toy car is accelerating to the left.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2