Force and Friction

Why is it harder for the boy in Image B to get down the hill?

• Motion

• Friction

• Work

• Displacement

Which would NOT be a way of reducing friction?

• making the surfaces smoother

• using lubricants such as waxes, oils, or grease

• changing from sliding friction to rolling friction using ball bearings

• Using kitty litter on snow and ice to help your car gain traction

Why is it important for basketball players to wear shoes with tread when playing?

• to increase the speed of the player

• to decrease the force between the player and the floor

• to decrease the amount of force needed for the player to move

• to increase friction between the floor and the player’s feet

What is the unit for force?

• Pound

• Newton

• Gram

• Liter

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Friction is a force that acts in an ___________ direction of movement.

• similar

• opposite

• parallel

• west

What surface would have the most friction?

• Glass

• Marble

• Pool table

• Sandpaper

Tags

NGSS.MS-PS2-2

What is the net force?

• 30 N Left

• 25 N Right

• 5 N Left

• 55 N Left

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What is the SI unit used to measure force?   

• Grams 

• Liters

• Pounds 

• Newtons 

You push on a tree with 20 N of force. If the tree doesn't move, the tree is pushing back on you with _____of force.

• 20N 

• 40N 

• 10N 

• 70N

Tags

NGSS.MS-PS2-1

To calculate net force, when forces are acting in the same direction, the forces are ...

• added 

• subtracted 

• mutiplied 

• divided 

Tags

NGSS.MS-PS2-2