1-21 Forces

A brick and a pencil are dropped at the same time from the same height. Which one would hit the ground first?

• brick

• pencil

• both would hit at the same time

Tags

NGSS.3-PS2-2

NGSS.5-PS2-1

A boy throws a baseball up in the air. Why does the baseball fall back down to the ground?

• the mass of the baseball decreases, causing it to fall

• the weight of the ball causes the ball to fall

• the force of gravity causes the ball to fall

• the density of the ball causes the ball to fall

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

True or False: objects that are smooth have LESS friction than objects that are rough

• TRUE

• FALSE

Imagine you decide to jump out of an airplane 🛩

Which force is going to pull you down towards earth

• Fluid Friction

• Static Friction

• Gravity

• The wind from the airplane

Tags

NGSS.MS-PS2-4

When you jump out of a plane to go skydiving 🪂 you thankfully have a parachute so you can safely land 🛫. Which answer choice explains why the parachute helps you land safely

• While gravity pulls you down very quickly, Air Resistance ( friction) pushes back against gravity and your parachute, slowing you down

• While gravity pushes you down very slowly, Air Resistance (friction) pulls back against gravity and your parachute, which means you can land safely

• When you have a parachute gravity is not able to pull you down as fast as it normally can

• The parachute will get caught on something on your way down which will save your life

Which of these materials do you predict would have the MOST amount of friction

• Metal

• Tile

• Sand Paper

• Denim

Tags

NGSS.2-PS1-1

NGSS.2-PS1-2

When most objects with smooth surfaces rub, there is less friction.

• True
• False

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

• similar
• opposite
• parallel
• west

Tags

NGSS.3-PS2-1

A puck slides along an icy surface. What makes it slow down?

• It runs out of push
• It rubs against the ice
• It runs out of electricity

Tags

NGSS.3-PS2-1

______________________ is the force that resists the motion of two surfaces that are touching.

• gravity

• friction

• force

• non-contact