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which of the following is an example of exerting a force?
a. A child running through a field
b. a train speeding down a track
c. a carpenter hammering a nail
d. an airplane soaring through the sky

c.a carpenter hammering a nail

what happens when two forces act in the same direction?
a. They cancel each other out
b. The stronger one prevails
c. They add together
d. their sum divided by two is the total force

c. They add together

the greater the mass of an object,
a. the easier the object starts moving
b. the greater its inertia
c. the more balanced it is
d. the more space it takes up

b. the greater its inertia

one way to increase acceleration is by
a. increasing mass
b. decreasing mass
c. decreasing force
d. increasing both force and mass proportionally

b. decreasing mass

air resistance is a type of
a. motion
b. acceleration
c. velocity
d. friction

d. friction

the law of universal gravitation states that any two objects in the universe without exception,
a. attract each other
b. repel each other
c. combine to provide a balanced force
d. create friction

a. attract each other

the achievement of lifting a rocket off the ground and into space can be explained by
a. Newton's first law
b. Newton's second law
c. Newton's third law
d. the law of conservation of momentum

c. Newton's third law

forces can be added together only if they are
a. acting on the same object
b. balanced forces
c. unaffected by gravity
d. substantial

a. acting on the same object

which of the following is an example of increasing friction intentionally?
a. waxing skis
b. adding grease to gears on a bike
c. throwing sand on an icy driveway
d. oiling a squeaky door

c. throwing sand on an icy driveway

a measure of an object's _____ is a measure of the object's inertia


one____is the force required to accelerate 1 kilogram of mass at 1 meter per second per second


a person traveling in a car that stops suddenly keeps moving forward due to ___


wet pavement is more slippery than dry pavement because the force needed to overcome ___friction is less than the force needed to overcome sliding friction


Newtons first law

an object in motion will remain in motion and an object at rest will remain at rest unless acted upon by an outside force

Newtons second law

acceleration of an object is directly proportioned to the force, and is inversely proportioned to the mass of an object

Newtons third law

when one object exerts a force on another object the second object exerts an equal but opposite force on the first object

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