Balanced and Unbalanced Forces

When the forces acting on a body are balanced, there will be no _________ force.

The resultant force is sometimes also known as the ______ force or the unbalanced force.

Tags

NGSS.MS-PS2-2

When the forces acting on the object at rest are balanced, the object will remain at rest. However, if balanced forces acting on a moving object, the object will continue to move in a straight line at a ___________ speed.

When an object moves in a straight line, which statement is true?

• when the object moves at a constant speed, the resultant force is zero

• when the object accelerates, the resultant force is zero

• when the object moves at a constant speed, the forward force is greater than the resistive force

• the object requires a resultant force in order to move at a constant speed

Tags

NGSS.MS-PS2-2

Which of the objects is in equilibrium?

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• 

Tags

NGSS.HS-PS2-1

In which of the following situations would no resultant force be required?

• a rocket accelerating straight upwards into space

• a ship sailing at a constant speed across the ocean

• a formula one car accelerating off the starting grid

Tags

NGSS.HS-PS2-1

___________ is a force that opposes the motion of an object caused by contact of two surfaces. It always acts in the opposite direction to the direction in which the object is moving.

Air resistance sometimes called _______ is a form of friction caused by a body moving through the air.

Friction results in energy loss due to the transfer of energy from kinetic to __________.

Tags

NGSS.HS-PS3-4

When an unbalanced force acts on an object, it can either speed up, slow down or change ____________.

Tags

NGSS.MS-PS2-2