Describing Motion Review

The airplane below is flying through the air. What force would cause the airplane to speed up?

• 100 N right

• 100 N left

• 700 N left

• 900 N left

Answer explanation

speed up = more force in the same direction

Tags

NGSS.MS-PS2-2

What force would cause the airplane to slow down but keep moving in the same direction?

• 100 N right

• 100 N left

• 700 N left

• 900 N left

Answer explanation

slow down = a LITTLE more force in the OPPOSITE direction

Tags

NGSS.MS-PS2-2

What force would cause the plane to continue to move at a constant speed?

• 100 N right

• 100 N left

• 700 N left

• 900 N left

Answer explanation

Constant speed = balance the forward force

Tags

NGSS.MS-PS2-2

What force would cause the plane to change direction?

• 100 N right

• 100 N left

• 700 N left

• 900 N left

Answer explanation

Change direction = MORE force in OPPOSITE direction than in forward direction

Tags

NGSS.MS-PS2-2

The box below is experiencing a backwards force of 5 N and a forwards force of 10 N. What would a force of 5 N forwards do to the box?

• Speed it up

• Slow it down

• Stop it

• Change its direction

Answer explanation

more force in same direction = SPEED UP

Tags

NGSS.MS-PS2-2

What would a force of 5 N backwards do to the box?

• Speed it up

• Slow it down

• Cause it to move at a constant speed

• Change its direction

Answer explanation

balanced force = constant velocity

Tags

NGSS.MS-PS2-2

What would a force of 2 N backwards do to the box?

• Speed it up

• Slow it down

• Stop it

• Change its direction

Answer explanation

a little less force in opposite direction = SLOW DOWN

Tags

NGSS.MS-PS2-2

What would a force of 10 N backwards do to the box?

• Speed it up

• Slow it down

• Stop it

• Change its direction

Answer explanation

more force in opposite direction = CHANGE DIRECTION

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

If an object is moving at a constant velocity, then the forces acting on the object are _________________.

• balanced

• unbalanced

What is the outcome of balanced forces acting on an object?

• Object will speed up

• Object will slow down

• Object will change direction

• The object's motion will not change