Force of Friction = Mu x Normal Force

When there's nobody pushing or pulling, what do we know about the NORMAL FORCE of the floor?

• There is NO normal force.

• The normal force is EQUAL to the weight of the box

• The normal force is BIGGER than the weight of the box

• The normal force is SMALLER than the weight of the box

Tags

NGSS.HS-PS2-1

When there's somebody pushing the box with a HORIZONTAL force, what do we know about the normal force?

• There is NO normal force.

• The normal force is EQUAL to the weight of the box

• The normal force is BIGGER than the weight of the box

• The normal force is SMALLER than the weight of the box.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

When there's somebody pushing the box with a force forming 30º with the floor, what do we know about the normal force?

• There is NO normal force.

• The normal force is EQUAL to the weight of the box

• The normal force is BIGGER than the weight of the box

• The normal force is SMALLER than the weight of the box.

Tags

NGSS.HS-PS2-1

When the inclination of the force increases, what can we say about the normal force?

• There is NO normal force in any of those cases

• The normal force is the SAME in both cases

• The normal force is BIGGER when the angle is small (45º)

• The normal force is SMALLER when the angle is small (45º)

Tags

NGSS.HS-PS2-1

When there's nobody pushing or pulling, what do we know about the FORCE of FRICTION of the floor?

• There is NO force of friction.

• The force of friction is EQUAL to the weight of the box

• There is a HORIZONTAL force of friction

• There is a VERTICAL force of friction

When there's somebody pushing the box with a HORIZONTAL force to move it with constant speed, what do we know about the force of friction?

• There is NO force of friction.

• The force of friction is EQUAL to the weight of the box

• There is a HORIZONTAL force of friction

• There is a VERTICAL force of friction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

When there's somebody pulling the box with a force that forms 30º with the floor, what do we know about the force of friction?

• There is NO force of friction.

• Friction is ALWAYS going to be EQUAL to the horizontal component of the person's force, regardless of the box it is moving or not

• If speed is CONSTANT, we know that friction is SMALLER than the horizontal component of the person's force

• If speed is INCREASING, we know that friction is SMALLER than the horizontal component of the person's force

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2