Science Exam Prep - Friction & Gravity only

____ is the force that pulls objects towards the ground

• acceleration

• gravity

• speed

• wind

which of the following describes a falling object?

• it has accelerated motion

• it has decelerated motion

• it can possibly stop moving

• it can go up again

what happens when you go againts gravity?

• more force is needed to accelerate

• less force is needed to accelerate

• no force is needed to accelerate

• no motion occurs

why do you need to move faster when going down a hill?

• gravity pulls you down

• gravity pulls you up

• wind pushes you

• none of the above

why is a parachute important to a skydiver?

• it directs their motion

• it makes them fall faster

• it slows down their motion to have a safe landing

• to make them have a pretty fall

• for them to crash in to a tree and die

makes a rolling ball stop

which of the following is true?

I. friction slows down a moving object.

II. smooth surface has more friction.

III. objects move slowly in a rough surface

IV. friction is not present in a smooth surface

• I.

• II.

• III.

• IV.

how are brakes useful? (asian brake)

• to make vehicles to move faster

• to slow down a moving vehicle

• to move the vehicle to any direction

• to move the vehicle easily

why are oil and other things applied to a machines parts?

I. to make the parts move easily

II. to prevent the parts from moving fast (kachow)

III. to protect the parts from wearing down

IV. to make the parts move slowly

• I.

• II.

• III.

• IV

which shows that more friction is useful?

jagged - adjective

with rough, sharp points protruding.

"the jagged edges gashed their fingers"

• wheels of cars that has jagged surface

• bowling lane that is smooth

• heavy apliances with rollers

• slides with smooth surface