Unit 4: Newton's Laws

Question 1

True or false: an object with no net force acting on it could be moving

Answer 1

true

Question 2

True or false: in deep space, you could exert a force on an object without it exerting a force on you

Answer 2

false

Question 3

True or false: an object with only one force acting on it must be accelerating

Answer 3

true

Question 4

True or false: friction can cause acceleration

Answer 4

true

Question 5

True or false: an object that has only 3 forces acting on it could be at rest and remain at rest

Answer 5

true

Question 6

True or false: an object with only one force acting on it could be at rest and remain at rest

Answer 6

false

Question 7

True or false: when you punch a glass window and break it, you exert more force on it than it exerts on you

Answer 7

false

Question 8

True or false: if an object is accelerating, all forces acting on it MIGHT be balanced

Answer 8

false

Question 9

True or false: in order for an object to maintain a constant velocity, a new force must be applied to it

Answer 9

false

Question 10

True or false: if all the forces acting on an object do not balance, the object’s velocity must be changing

Answer 10

true

Question 11

In physics, a ______ is a push or a pull.

Answer 11

force

Question 12

The standard unit of force is the ________.

Answer 12

Newton

Question 13

The standard unit of mass is the ____________.

Answer 13

kilogram

Question 14

The ____________ is the sum of all the individual forces acting on an object.

Answer 14

net force

Question 15

Newton’s First Law:

If the net force on an object is zero, _______________.

Answer 15

it will not accelerate

its velocity will not change

Question 16

If the object is at rest, it will remain at rest.

Answer 16

static equilibrium

Question 17

The net force on an object can be zero in two different ways:

Answer 17

1. no forces act on the object

2. the forces that act on the object all balance

Question 18

_______ is a force that opposes motion and therefore can cause a change in an object’s velocity.

Answer 18

friction

Question 19

Newton’s Second Law:

If the net force on an object is not zero, ___________________.

Answer 19

the object will accelerate because it has a force imbalance

Question 20

If the net force on an object is not zero, the acceleration will be in the direction of the __________.

Answer 20

net force

Question 21

If the net force on an object is not zero, the ___________ will be directly proportional to the net force.

Answer 21

acceleration

Question 22

If the net force on an object is not zero, the acceleration will be inversely proportional to the ____.

Answer 22

mass

Question 23

Netwon’s Third Law:

Forces always _____________.

Answer 23

occur in pairs

Question 24

The forces in every pair are equal in ______________, but opposite in direction.

Answer 24

strength (magnitude)

Question 25

The _______________ is a supporting force applied on an object in a direction that is perpendicular to the supporting force.

Answer 25

normal force

Question 26

Frictional force is always __________________.

Answer 26

in opposition to motion

if the box moves up the ramp, friction is down and vice versa