Pulse Check Unit 6

The pictures show two boys pushing a box in opposite directions. What caused the position of the box to change?

(hint: use the tree as a point of reference)

• • A

    The forces were balanced, which made the box easy to move.

• • B

    The student on the right used more force than the student on the left.

• • C

    The student on the left used more force than the student on the right..

• • D

    The surface was smooth, and there was no friction.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Newton’s first law of motion is also called the law of inertia. What statement below is NOT true of inertia?

• • Forces must be balanced for there to be a change in motion, direction, or speed.

• • If an object is in motion, it will stay in motion until a force acts on it.

• • If a force acts on an object, it can change its direction.

• • Forces must be unbalanced for there to be a change in motion, direction, or speed.

Two students are pushing on opposite sides of a door at the same time. Student 1 is pushing with a force of 256 N to the right. Student 2 is pushing with a force of 158 N to the left. Which diagram shows the forces correctly?

(hint: PAY ATTENTION TO THE ARROWS! They show the direction that each student is pushing!)

• 
• 
• 
• 

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Two teams are playing tug-of-war. Which statements below are true about this game of tug-of-war?

(2 Answers)

(hint: Pay attention to the arrows)

• • The forces are balanced, and there will be no motion.

• • There will be motion, and the rope will move to the left.

• • There will be motion, and the rope will move to the right.

• • The net force on the rope is 37 N.

• • The net force on the rope is 43 N.

Tags

NGSS.MS-PS2-2

The scenarios describe different forces applied to a car. Identify the type and effect of the forces described in the scenarios.

1. A car sits still at a red light.

(2 Answers)

• It is Balanced

• It is unbalanced

• There is motion

• There is no motion

The scenarios describe different forces applied to a car. Identify the type and effect of the forces described in the scenarios.

2. A car travels at a constant speed of 60 mph along a straight section of highway.

(2 Answers)

• It is balanced.

• It is unbalanced.

• It is in Constant Motion

• It is changing speed

The scenarios describe different forces applied to a car. Identify the type and effect of the forces described in the scenarios.

3. A driver switches lanes to prepare to exit.

(2 Answers)

• It is balanced

• It is unbalanced

• There is a change of direction

• The driver stops

The scenarios describe different forces applied to a car. Identify the type and effect of the forces described in the scenarios.

4. A driver steps on the brakes to avoid a crash.

(2 Answers)

• It is balanced

• It is unbalanced

• It slowed down.

• It sped up.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5