What is velocity?

• The same thing as speed

• Speed plus direction

• miles per hour

Select the BEST definition of acceleration.

• change in velocity

• increase in speed

• decrease in speed

Friction acts in a direction _____________ to the direction of an object's motion.

• equal

• opposite

• perpendicular

True or false: a moving object will keep moving unless acted upon by an unbalanced force.

• True

• False

An object at rest remains at rest, unless acted upon by an unbalanced force, due to its ___________.

• mass

• gravity

• inertia

• friction

A change to an object's motion is caused by __________.

• velocity

• acceleration

• balanced forces

• unbalanced forces

Tags

NGSS.MS-PS2-2

After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals___________.

• Zero, since no force is needed to keep it moving.

• Twice the force with which it was fired.

• Half the force with which it was fired.

• The same amount of force with which it was fired.

Tags

NGSS.MS-PS2-2

Newton's _______ Law of Motion describes action/reaction force pairs.

• First

• Second

• Third

Tags

NGSS.MS-PS2-1

A child slipped and broke their wrist when they ran on a newly waxed floor. What is the reason?

• The wax increased the friction between the floor and the kid's feet.

• The wax produced a new force between the kid's feet and the floor.

• The wax decreased the friction between the floor and the kid's feet.

• The wax provided a magnetic force between the floor and the feet.

Tags

NGSS.MS-PS2-2

You push a shopping cart down the aisle. It's full of groceries and has a mass of 18 kg. The cart accelerates at a rate of 3 m/s2. How much force did you exert on the cart? (How much FORCE did you apply to the cart when you shoved it?)

• 6 N

• 22 N

• 54 N

• 15 N

Tags

NGSS.HS-PS2-1