Physics Unit 4

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The law of inertia states that an object...

-at rest will remain at rest unless acted on by an outside force -will continue moving at the same velocity unless an unbalanced force acts on it -will continue moving in a straight line unless an unbalanced force acts on it

your textbook weighs 2N. When held at rest above your head, the net force of the book is ...

0N

The mass of a pet turtle that weighs 10 N is about

1 kg

a jet has a mass of 100,000kg. each engine has a force of 50,000N. What is the jet's acceleration in m/s^2

1 m/s^2

How much inertia would a 1 kilogram mass of feathers have compared to a 2 kilogram mass of feathers?

1/2 as much

if the acceleration of gravity on jupiter is 3x that on earth, what will the mass of 10kg of copper be on jupiter?

10kg (mass doesn't change)

an object is pulled up with two forces of 20N and 35N. however, gravity pulls down on it with 40N. Find the net forces size and direction

15N going up

a 10N and 5N force are working on an object in the same direction. the mass is 5kg. what is the acceleration

3 m/s^2

mass of something that weighs 56N

5.7kg

A 4kg object has 35N pulling to the right, 20N pulling up, 5N pulling to the left. find its acceleration and direction

9.0m/s^2 at 33.7 degrees north of east

what is the weight of 1kg mass

9.8N w=mg

the metric unit of weight is the

Newton

newton's second law states that

a=F/m

this quantity measures the rate of change of velocity.

acceleration

true or false Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object.

always true

what has no change in its state of motion

an object at equilibrium an object at rest an object at constant speed

if an object's mass is increasing while a constant force is applied to the object, the acceleration _________

decreases

true or false according to newton's third law, when an object exerts a force on another object, the second object exerts a reaction force equal and opposite on yet another force

false

true or false if a hockey puck slides on a perfectly frictionless surface, it will eventually slow down because of its inertia.

false

true or false the letter "g" is the symbol for force due to gravity

false g= -9.8 m/s^2 =acceleration

accelerations are produced by

forces

according to newton's third law, if you push gently on something, it will push...

gently on you

forces always occur

in pairs

An objects resistance to a change in its state of motion.

inertia

what is the only quantity that affects the amount of inertia something has

mass

For every action there is an equal and opposite reaction

newton's third law

what are the english units to measure mass

slugs

when an object falls through a vacuum, its velocity increases and its acceleration ________

stays the same

As a ball falls, the action force is the pull of Earth's mass on the ball. What is the reaction to this force?

the pulls of the ball's mass on the earth

a bug splatters against the window of a moving car. compared to the force of the car on the bug, the force of the bug is...

the same size

Which has more mass, a kilogram of feathers or a kilogram of iron?

they are the same

true or false an objects weight depends on it's location, but it's mass does not

true

true or false inertia is the resistance any material object has to a change of state of it's motion

true


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