Newtons 1st, 2nd, and 3rd Law of Motion

Science later greatly advanced when Galileo favored

 

experiment over philosophical discussions.

Inertia is defined as a

property of matter

The first scientist to introduce the concept of inertia was

Galileo

Galileo taught us that if you roll a ball along a level surface it will

keep rolling if friction is absent

If no external forces act on a moving object, it will

continue moving at the same speed

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

follow a straight line path

When no forces act on moving objects their paths are normally

straight lines

When you flick a card from beneath a coin that hardly moves, you're illustrating

inertia

While you are standing in the aisle of a bus, the driver suddenly makes a left turn. You lurch to the right due to

your tendency to keep moving forward

Due to inertia, perhaps a railroad train in motion should continue moving indefinitely when its engine is turned off. This is not observed because railroad trains

encounter opposing forces

If your automobile runs out of fuel while driving, the engine stops. You don't come to an abrupt stop due to

inertia

Tension is actually a force that tends to

stretch something

Which concept is being illustrated when a tablecloth is quickly yanked beneath dishes resting on a table?

inertia

A force is a vector quantity because it has both

magnitude and direction

A block pulled to the left with 15 N and to the right with 5 N at the same time experiences a net force of

10N

Vector Quantity

magnitude and direction

A tree stump is pulled northward by a 10-N force at the same time a 25-N force pulls it southward. The resultant force has a magnitude of

15 N

Nellie pulls with a force of 50 N on a horizontal rope tied to a tree at rest. The net force on the rope is

zero and the ropes tensions is 50N

A hockey puck sliding across the ice finally comes to rest because

of friction

Whenever the net force on an object is zero, its acceleration

zero

If an apple experiences a constant net force, it will have a constant

acceleration

If the net force on a cart is tripled, the cart's acceleration

3 times as much

A mobile phone is pulled northward by a force of 10 N and at the same time pulled southward by another force of 15 N. The resultant force on the phone is

5N

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

10N

An object's weight is properly expressed in units of

Newtons

A 1-kg mass at the Earth's surface weighs

10 N

A kilogram is a measure of an object's

mass

The mass of a lamb that weights 110 N is about

11 kg

A bag of groceries that has a mass of 10 kilograms weighs about

100 N

Compared to the mass of an apple on Earth, the mass of the apple on the Moon is

the same

An object with twice as much mass as another object has twice as much

inertia

Strange as it may seem, it is just as difficult to accelerate a car on a level surface on the Moon as it is here on Earth because

the mass of the car is independent to gravity

Your weight as measured on your bathroom scale is

the force due to gravity of you

A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock has the greater mass?

the one on the moon

A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?

2000 N

A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is the mass of the car?

1500 KG

A boulder following a straight-line path at constant velocity has

zero accelertation

Nellie pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration?

3.0 m/s

the newton is a unit of

force

You cannot exert a force on a wall

unless the wall simultaneously exerts the same amount of force on you.

When you rub your hands together, you

cannot push harder on one hand than the other

When you drop a rubber ball on the floor it bounces back. The force exerted on the ball to produce bouncing is by the

floor

When a skateboarder pushes on a wall,

the wall pushes on the skateboarder.

such a push couldn't happen unless the wall pushed on the skateboarder.

an interaction occurs between the skateboarder and the wall.

When you walk, you push on the floor to the left and the floor

pushes you to the right

A pair of action-reaction forces always

act on different objects

Harry pulls on the end of a spring attached to a wall. The reaction to Harry's pull on the spring is

the spring pulling on Harry

When a karate chop breaks a board with a 3000-N blow, the amount of force that acts on the hand is

3000 N

For every action force, there must be a reaction force that

is equal in magnitude

An automobile and a golf cart traveling at the same speed collide head-on. The impact force is

the same for both

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the

arrow pushes against the bowstring

To produce an acceleration to a system there

must be a net force on a system

A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of impact is

the same for both

As a ball falls, the action force is the Earth's pull on the ball. The reaction force is the

the balls pull on the Earth

When a cannonball is fired from a cannon, which undergoes the greater acceleration?

the cannonball

Earth pulls on the Moon, and the Moon pulls on Earth, which tells us that

these 2 pulls comprise a action reaction pair

When a baseball player bats a ball with a force of 1000 N, the reaction force that the ball exerts against the bat is

1000N

The force exerted on the tires of a car that directly accelerate it along a road is exerted by the

road

A Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle that undergoes the greatest change in velocity will be the

Volkswagen