Force and Friction

What is the unit of force?

• gram (g)

• centimeter (cm)

• newton (N)

• liter (L)

Which device can be used to measure force?

• 
• 
• 
• 

Which of the following are represented by the arrow in a force diagram?

I Direction

II Magnitude

III Energy

IV Speed

• I and II only

• I and III only

• II and IV only

• III and IV only

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What will friction do to moving objects?

• Friction will speed them up.

• Friction will make them rough.

• Friction will slow them down.

• Friction will keep it moving.

Tags

NGSS.MS-PS2-2

Which is NOT an advantage of friction?

• Friction helps in walking.

• Friction allows us to write on paper.

• Cars and buses move safely on roads due to friction.

• Friction causes wear and tear.

Which box produces greater friction and why?

• The small box because it is lighter.

• The big box because it is lighter.

• The small box because it is heavier,

• The big box because it is heavier.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the resultant force acting on the box?

• 30 N to the left

• 30 N to the right

• 10 N to the left

• 10 N to the right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the resultant force acting on the object?

• 25 N to the left

• 25 N to the right

• 5 N to the left

• 5 N to the right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which arrow shows the direction of the friction that acts on the bicycle?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which of the following statements describes the advantage of friction?

• A ship has to work extra to keep the ship moving against friction.

• Friction wears out contacting surfaces of tires.

• Friction produces heat that damages sensitive parts of engines and machines.

• The friction between a hand and a pencil prevents the pencil from slipping.