Forces

According to Newton's First Law, an object at rest will tend to do which of the following?

• stay at rest
• stay in motion
• speed up
• change in direction

What are the two ways we can have UNBALANCED forces?

• 1) unequal forces in opposite directions  and 2) forces in same direction
• 1) forces in same direction and 2) equal forces in opposite direction
• 1) unequal forces in opposite directions and 2) forces in opposite directions but same sizes
• you can't have unbalanced forces, forces will always balance each other out

Tags

NGSS.HS-PS2-1

The biker travels at constant velocity. All of the following are true except-

• he has a net force acting on him.

• the normal force is equal to his weight.

• the force of friction acts opposite the direction of his motion.

• the force of friction is equal to the forward force he applies.

Tags

NGSS.MS-PS2-2

In the free-body diagram, which of the following is the gravitational force acting on the balloon?

• 5120 N

• 950 N

• 1520 N

• 4050 N

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Which of the following could cause an acceleration?

• A balance between two forces
• A balance between three forces
• An imbalance between two forces
• Zero forces

Tags

NGSS.MS-PS2-2

Fill in the blanks: _____ does not change from place to place, but _____ can change because of differences in the strength of gravitational pull.

• acceleration, weight
• weight, acceleration
• mass, weight
• weight, mass

Tags

NGSS.MS-PS2-4

A child pulls on a toy with a force of 25 N to the right. Another child pulls the toy with 15 N to the left. The net force is:

• 1.7 N to the right
• 1.7 N to the left
• 10 N to the right
• 10 N to the left

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The type of friction that prevents an object from moving is called _______ friction.

• rolling

• fluid

• kinetic

• static

A book rests on a table. The normal force points:

• Up
• Down
• Left
• Right

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

The equation for the force of friction is _______.

• Ff = µF_g

• Ff = µF_N

• Ff = µF_T

• Ff = µF_s