Forces and Motion

1. An eagle crisscrossed a lake for three hours, searching for fish for its young. It covered 24 miles in total. What was the eagle’s average speed?

• 8 miles per hour

• 1. 24 miles per hour

• 1. 48 miles per hour

• 1. 96 miles per hour

1. Which of the following is evidence of unbalanced forces at work?

• 1. Two arm wrestlers’ clasped hands remain in a fixed position.

• 1. A chair sits motionless on a hardwood floor.

• A spacecraft moves in a straight line and at a fixed speed toward Pluto.

• 1. A golf ball in the air arcs downward and then hits the ground.

Tags

NGSS.MS-PS2-2

A runner races in the 100 meter dash.  It takes her 10 seconds to finish.  What is her average speed?

• 10 m/s
• 1000 m/s
• 100 seconds
• 10 seconds

Tags

NGSS.MS-PS3-1

What is the formula to calculate average speed?

Are the forces acting on the object balanced or unbalanced? The man does a flip on the fly board.

(a)  

• unbalanced
• balanced

Tags

NGSS.HS-PS2-1

How will this object move?

• It will not move

• It will move in both directions

• It will move to the right

• It will move to the left

Answer explanation

When two forces act on an object in opposite directions, their forces are subtracted from each other.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

Shadell pushes a box 35 N to the right. Nazai pushes the box 25 N in the same direction. What is the net force?

(a)  

• 60 N unbalanced to the right
• 60 N balanced to the right
• 10 N balanced to the right
• 10 N unbalanced to the right

Answer explanation

When two forces act on an object in the same direction, their forces are added to each other.

Tags

NGSS.MS-PS2-2

Balanced or Unbalanced

(a)  

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

If an object is not moving the forces acting upon it are (a)  

A (a)   is a push or a pull on an object.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1