Contact Forces

Forces that are equal in size but opposite in direction are __________

• inertial forces

• frictional forces

• balanced forces

• net forces

Whenever a body is in motion, there is always ____ to oppose the motion.

• acceleration

• inertia

• gravity

• friction

Tags

NGSS.MS-PS2-2

Friction always acts in a direction _____ to the direction of motion.

• opposite

• the same way

• parallel

• perpendicular

Tags

NGSS.MS-PS2-2

The following example shows:

• Unbalanced forces

• balanced forces

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The following example shows:

• Unbalanced forces

• balanced forces

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Many forces can act on a single object at once.

• True

• False

Tags

NGSS.MS-PS2-2

Which force may slow or stop an object in motion?

• balanced forces

• mass

• friction

• direction

Mike places a ball on the ground and kicks it, it moves. Why does the ball move?

• The kick decreases the force of gravity acting on the ball

• The kick applies a contact force to the ball

• The kick removes friction between the ball and the ground

• The kick decreases the weight of the ball

Tags

NGSS.3-PS2-1

What causes a change in shape in colliding objects?

• friction

• motion

• force

• magnetism

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What causes a change in motion in colliding objects?

• force

• friction

• magnetism

• energy

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2