## 40 terms · Newton's First, Second and Third Laws of Motion

### inertia

An object in motion tends to stay in motion, and an object at rest tends to stay at rest, unless the object is acted upon by an outside force.

### In space Newton's First Law acts like this

Objects will follow their natural trajectories until they are stopped by an outside force.

### On earth Newton's First Law acts like this

The atmosphere will eventually slow down all moving objects, but in a vacuum (an empty space with no air or atmosphere), like space, it will be more obvious that object obey Newton's Laws.

### Car or a bus that comes to a stop

Give examples of some of the most common vehicles that affect this First Law.

### An obstruction in the road such as a wall or another object.

If a car is driving down the road, what sort of outside force would cause the vehicle to stop?

### True

An outside force stops the vehicle, but the passengers, who are moving at a high speed are not stopped and continue to move at the same speed as the care. Is this true or false?

### On earth

When a car hits a cement barrier (an outside force stops it from moving), the dummy, who is not wearing a seat belt flys through the windshield at the same rate of speed as the car was traveling.

### gravity

The combination of the downward force of _________ and the horizontal force of the moving car caused the dummy to fly out and hit the ground.

### In space

If this collision happened in zero g, in a vacuum, the dummy would keep on flying away from the car at 60mph in a straight line. There would be no gravity to pull him down to the ground.

### acceleration

Is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed to accelerate the object.

### Newton's Second Law

A rate at which speed change (M/S/S) F = Forces expressed in N (Newton) is produced when it effects on a mass. The greater the mass amount, the greater the amount of force needed to accelerate.

### Newton's Second Law

Heavier objects require more force to move the same distance than do lighter, objects.

### 50 kgm/s/s, which is equal to 50 newtons

Mike's car weighs 1,000 kg and is out of gas an he is trying to push the car to a station. He makes the car go 0.05 M/s/s. Figure out how many Newtons of force it takes to push the car. To find force use this equation: F=MA, so you plug in the data and get f=1,000KG x 05. m/s/s/

### 100 kgm/s/s which equals 100 newtons.

Bob's van is out of gas. Bob is pushing to the nearest station. His van is 2,000kg and he makes the car go 0.05 m/s/s. Use Newtons formula to complete the equation. F=MA, so plug in data and get F=2,000kgz .05 M/s/s What is the number of newtons that you have.?

### In the cold void of space

There is no air for jets to suck or for propellers to churn, yet space ships can maneuver in a vacuum.

### The engines propel gas particles out the back of the space ship.

How does one maneuver in a vacuum in space?

### the van pushes back

Every action has an equal and opposite reaction. When Bob pushes the van, the van ...