Question

newtons 2nd law scholastic study jams

1. your neighbor is riding her bike around the block. when she slows down and turns a corner, what changes about her?

a) her velocity
b) her friction
c) her speed only
d) her balance

1. the rate at which an object’s velocity changes is called what?

a) inertia
b) actualization
c) acceleration
d) completion

1. what is inertia?

a) the amount of force necessary to make an object at rest start moving
b) an object’s velocity combined with its friction
c) what keeps an object steady, whether at rest or moving at the same velocity
d) the amount of friction necessary to slow down an object in motion

1. your skateboard begins to slow down when you roll off the sidewalk and across gravel. what is at work?

a) gravity
b) friction
c) balance
d) all of the above

1. what can be measured by acceleration?

a) how much an object slows down
b) how much an object speeds up
c) an object’s change in direction
d) all of the above

1. your dog’s wagging tail knocks over the cup of pencils sitting on your desk. what kind of force is his tail?

a) an unbalanced force
b) an inert force
c) gravitational force
d) friction

1. if a hockey stick acts on a resting puck, what will happen?

a) the puck will remain inert and the hockey stick will accelerate.
b) the puck will balance on the end of your hockey stick until you drop it.
c) the hockey stick will not move the puck, but the puck will move the hockey stick.
d) the hockey stick will change the speed of the puck and make it accelerate

Explanation:

Question 1

Velocity is a vector quantity (has speed and direction). When the neighbor slows down (change in speed) and turns a corner (change in direction), her velocity changes. Friction doesn't necessarily change here, speed only is incorrect as direction changes, and balance isn't the main change related to motion parameters.

Acceleration is defined as the rate of change of velocity. Inertia is the tendency to resist motion change, actualization and completion are not physics terms related to velocity change.

Inertia is the property of an object to remain at rest or in uniform motion (same velocity) unless acted upon by a net force. Option a is about force to start motion, b combines velocity and friction (incorrect), d is about friction to slow down (incorrect).

Answer:

a) her velocity

Question 2