Forces and machines

______________ is a force that attracts any two objects with mass.

• GRAVITY

• FRICTION

• MOVEMENT

• SIMPLE MACHINE

_________________ refers to the force generated by two surfaces that contacts and slide against each other

• GRAVITY

• FRICTION

• MOVEMENT

• MACHINE

Which object will fall faster?

• A plastic ball

• An iron ball

• A cotton ball

What measurements do we need to know the speed (velocitat mitjana) of an object?

• Distance and meters

• Time and minutes

• Distance and time

• None of these

What object do we need to measure the exact distance?

• Watch

• Our feet

• Meter

Which object will fall to the ground first?

• A table

• A bottle

• A ticket

• A shoe

Can two books be separated with the pages inserted (intercaladas)?

• No.

• Yes.

How does an object move faster?

• Smooth flor (terra llis)

• Rough flor (terra rugós)

• Both are the same

What materials did we use to make the car?

• Bottle caps, paper rolls, straws and sticks.

• Paper rolls, straws and balloons.

• Bottle caps, paper rolls, sticks and balloons.

• Bottle caps, paper rolls, straws, sticks and balloons.

Which is not a simple machine?

• Pulley

• Bicycle

• Wheel

• Lever