motion/newtons laws and forces

a student kicks a ball and it rolls forward.which statement best explains why this happens?

• the force of gravity pulls down on the ball

• the force of friction is greater than the force of gravity

• the force of the kick is greater than friction on the ball

• the force of ball is greater than kick, so ball moves

Tags

NGSS.MS-PS2-2

two people pull on a rope in opposite directions.neither person is moving. which is true

• they are using no force

• they are forcing the rope to bend

• they are using the same amount of force in opposite directions

• one is stronger than the other

which is a correct statement about forces

• all forces act in pairs

• all forces are balanced

• a pulling force is required to move an object

• a pushing force is required to move an object

Tags

NGSS.MS-PS2-1

how do unbalanced forces acting in opposite directions affect the motion of an object at rest

• the object will move in the direction of the lesser force

• the object will move in the direction of the greater force

• the unbalanced forces will allow the object to remain at rest

• unbalanced forces will cause objects to move at varied speed

Tags

NGSS.MS-PS2-2

the force that prevents the ball from rolling on the ground from continuing its path forever

• inertia

• momentum

• friction

• kinetic energy

which explains the difference between speed and velocity

• velocity requires direction, speed does not

• speed requires momentum, velocity does not

• velocity is living motion, speed is nonliving motion

• speed is upward motion, velocity is forward motion

on a graph showing distance versus time, which type of line indicates no motion

• vertical line

• horizontal line

• upward-curving line

• downward-curving line

how might the speed of a vehicle be determined if its speedometer is broken

• by measuring velocity and time

• by measuring distance and time

• by measuring velocity and distance

• by measuring acceleration and distance

when a roller coaster makes sudden turns why is a persons body thrown from side to side

• because of the speed of the roller coaster

• because of the inertia of the persons body

• because of friction of the roller coaster on its tracks

• because of deceleration of the roller coaster as it turns

Tags

NGSS.MS-PS2-2

which term describes the tendency of an object to resist changes in motion

• force

• friction

• inertia

• velocity