Friction is defined as

force that opposes motion between two surfaces in contact

Weight is best described as

the downward force exerted on objects due to gravity.

What is the reaction force when you place a cup on a table?

the force of the table on the cup

What happens immediately after a skydiver opens her parachute?

Air resistance greatly increases.

If a 5-kg cannon ball and a 15 kg cannon ball are dropped from the same height at the same time

they will hit the ground at the same time.

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Forces and Friction

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Physics quiz on forces, Newton's laws of motion, friction,

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Questions 13

Answers

1
Friction is defined as
force that opposes motion between two surfaces in contact
rate at which velocity changes
resistance of an object to a change in its velocty
speed of an object in a particular direction
2
Weight is best described as
the downward force exerted on objects due to gravity.
an object's resistance to acceleration.
a force solely dependent on an object's mass.
what causes an object to fall.
3
What is the reaction force when you place a cup on a table?
The force of the cup on the table
the force of gravity on the table
the force of the table on the cup
the force of gravity on the cup.
4
ID the law: "Every object maintains constant velocity unless acted upon by an outside force."
Newton's third law
Newton's first law
the law of conservation of momentum
Newton's second law
5
Objects accelerate only when a(n) ________ net force acts on them.
unbalanced
balanced
normal
equal and opposite
6
The amount of matter in an object is called _______.
weight
mass
inertia
heaviness
7
When air resistance balances the weight of an object that is falling, the velocity
rapidly increases.
slowly decreases.
none of the above.
remains constant.
8
What happens immediately after a skydiver opens her parachute?
The skydiver is in free fall.
Air resistance greatly increases.
The skydiver's speed greatly increases.
The force of gravity greatly increases.
9
The acceleration of an object is _________ proportional to the net force acting on it.
directly
indirectly
inversely
not
10
If a 5-kg cannon ball and a 15 kg cannon ball are dropped from the same height at the same time
the 5 kg ball will hit the ground first.
the 15 kg canon ball will hit the ground first.
they will hit the ground at the same time.
impossible to predict.
11
The combination of all the forces acting on an object is called the
union of forces.
super force.
net force.
total force.
12
The metric unit of force is called the ____________ .
kilogram
newton
stone
pound
13
The law that states for every action force there is an equal and opposite reaction force is
Newton's first law of motion
Law of conservation of momentum
Newton's second law of motion
Newton's third law of motion

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