Forces and Motion

Which example identifies a change in motion that produces acceleration?

• a ball moving at a constant speed around a circular track

• a vehicle moving down the street at a steady speed

• a speed skater moving at a constant speed on a straight track

• a particle moving in a vacuum at constant velocity

Tags

NGSS.MS-PS2-2

The force that keeps an object moving in a circle is called

• inertia

• fluid friction

• momentum

• centripetal force

As an astronaut travels far away from Earth, her weight

• increases because gravity increases

• decreases because her mass decreases

• decreases because gravity decreases

• remains the same because her mass remains the same

Tags

NGSS.MS-PS2-4

Your weight equals your

• mass times your speed

• mass divided by the net force acting on you

• mass

• mass times the acceleration due to gravity

The slope of a speed-time graph indicates

• speed

• acceleration

• velocity

• direction

The SI unit of force is the

• newton

• joule

• kilogram

• meter

A person walks 1 mile every day for exercise, leaving her front porch at 9 am and returning to her front porch at 9:15 am. What is the total displacement of her daily walk?

• 0

• 1 mile

• 15 minutes

• none of the above

Which universal force acts only on the protons and neutrons in a nucleus?

• gravitational

• magnetic

• electric

• strong nuclear

According to Newton's second law of motion, the acceleration of an object equals the net force acting on the object divided by the object's

• velocity

• mass

• momentum

• weight

Tags

NGSS.MS-PS2-2

Which distance can be most accurately measured with a ruler?

• the length of a river

• the distance between two cities

• the width of a book

• the size of an object under a microscope