science chapter 2.3.4

Question 1

Forces change an object’s MOTION by changing its…(2/3 things)

Answer 1

speed, direction, or both its speed and direction

Question 2

The only forces that can change an objects velocity are

Answer 2

unbalanced forces

Question 3

You can tell when forces on an object are unbalanced when…

Answer 3

the motion of the object changes

Question 4

unbalanced forces can change an object’s velocity by…

Answer 4

changing its direction

Question 5

Unbalanced forces can make an object ACCELERATE by…(2/3 things)

Answer 5

speed, direction, or both its speed and direction

Question 6

the acceleration of an object is equal to the net force acting on the object divided by the object’s mass.

Answer 6

Newton’s second law of motion

Question 7

Acceleration (in m/s2) =

Answer 7

mass (kg)

Question 8

any motion in which an object is moving along a curved path

Answer 8

circular motion

Question 9

In a circular motion, a force that acts perpendicular to the direction of motion, toward the center of the curve

Answer 9

centripetal force

Question 10

any object in space that orbits a larger object

Answer 10

satellite

Question 11

A push on opposite forces causes acceleration…

Answer 11

away from the object pushed on

Question 12

when one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object

Answer 12

Newton’s third law of motion

Question 13

the force two objects apply to each other

Answer 13

force pair

Question 14

Force pairs don’t cancel out because…

Answer 14

each force is exerted on a different object

Question 15

In a force pair, one force is called the ____________, and the other is called the ______________.

Answer 15

action force, reaction force

Question 16

For every action force, there is a…

Answer 16

reaction force that is equal in strength but opposite in direction

Question 17

a measure of how hard it is to stop a moving object

Answer 17

Momentum

Question 18

Momentum (in kg.m/s) =

Answer 18

mass (kg) x velocity (m/s)

Question 19

The force on an object is also known as its…

Answer 19

change in momentum

Question 20

the total momentum of a group of objects stays the same unless outside forces act on the objects.

Answer 20

the law of conservation of momentum

Question 21

when colliding objects bounce off each other

Answer 21

elastic collision

Question 22

when objects collide and stick together

Answer 22

Inelastic collision

Question 23

The momentum in every collision always…

Answer 23

stays the same

Question 24

superficial

Answer 24

minimal/occuring or existing at the surface