Newton’s Laws
Which Law is this? An object in motion/rest stays in motion/rest until acted upon by outside force.
Newton‘s First Law of Motion.
A car is traveling 30 miles per hr. A truck comes up behind at 50 miles per hr. The truck slams into the back of the car. Will the car’s passengers be flung forward or backward in their seats?
The passengers have the same velocity as the car. When the truck hits them, they will be flung backwards.
A box (mass=15kg) is given an initial shove and allowed to slide across the floor with no person pushing on it. If the box slides north and experiences and acceleration of 1.1 meters per second 2 to the south, what is the kinetic frictional force between the box and the floor?
The kinetic frictional force between the box and the floor is 16.5 newtons to the south because the box is sliding to the south.
Why did the math look sad?
Because it had too many problems!
Complete the sentence.. For every action there is__
An equal and opposite reaction.
bomber is dispatched to drop a bomb on a factory. There are 3 points at which the bomb could be dropped as the plane travels from left to right. Assuming the bomb has no propulsion system of its own, at which point should the bomb be dropped:directly above the building, to the right or to the left of the building?
To the left.
A child wants to slide a block (mass= 10 kg) to the east. Static Friction between the and the floor is capable of resisting motion with a force of 30 Newton’s west, while the kinetic frictional force is 20 Newton’s west. What force must the child exert in order to get the block moving?
The child has to move the block by breaking the static friction that is resisting the movement of the block. Since the floor is resisting the box with 30 newtons to the west, the child has to push the box a little bit more than 30 newtons but to the east in the opposite direction.
How do you stop a bull from charging?
By canceling it’s credit card!
What law is this? For every reaction, there is an equal and opposite reaction.
Newton’s Third Law of Motion.
A cowboy is riding his horse at a fast speed. Suddenly, the horse plants its feet and stops, and the cowboy falls off. Will the cowboy fall forward, backward, left or right?
The cowboy will fall forward.
A child wants to slide a block (mass= 10 kg) to the east. Static Friction between the and the floor is capable of resisting motion with a force of 30 Newton’s west, while the kinetic frictional force is 20 Newton’s west. If the block accelerates at 1.5 m/sec2 east as a result of the child’s force, what was the actual force used?
35 Newtons East.
What do you call a beehive without an exit?
What is Newton’s Second Law of Motion?
When an object is acted on by one or more outside forces, the total is equal to the mass of the object times the resulting acceleration.
You drop an object from the top of a building and measure the speed the instant before it hits the ground. Suppose that you did the experiment twice: once on a clear, sunny day and once in a thick fog. Would there be any difference in the speed? If so, on which day would the object travel faster?
There would be difference in the speed, because fog is very thick and would cause air resistance, while on a sunny day the air would be thinner.
In order to clear an area, a construction worker pushes on a large rock (mass=30kg) that‘s in the way. Once he gets it moving, it begins to accelerate 0.12 meters/second2 to the north. If the construction worker applies 400 newtons, what is the frictional force be the rock and the ground?
Why did the football coach go to the bank?
To get his QUARTER back!
What is the equation for Newton’s Second Law of Motion?
total force=(mass)*(acceleration)
An ice skater stands on the ice in his skates. He is holding a ball. Assuming that friction is so small it can be ignored, what will happen to the ice skater if he suddenly throws a ball hard to the west?
The skater will go in the opposite direction that he is throwing the ball. The friction on the ground will slow him a bit but because of Newton’s Third Law there will be an opposite or equal reaction even though the ball does not push the skater.
A man’s car (mass = 1,500 kilograms) has broken down and he is pushing it to a gas station. Ignoring friction, with what total force (in Newtons) must the man push in order to make the car accelerate 0.03 meters per second squared to the east?
45 Newtons to the East.
Why is Peter Pan always flying?
Because he NEVERLANDS!