Newton's Laws of Motion
If the forces are balances what is the resulting acceleration?
0
A small child has a wagon with a mass of 10 kilograms. The child pulls on the wagon with a force of 2 newtons. What is the acceleration of the wagon?
0.2 N/s 10kg divided by 2N
What is the net force if you push a cart to the right with 5N of force and a friend pushes the cart to the left with 5N of force?
0N
PART 1 Which law is associated with inertia?
1st Law
What is required to cause acceleration?
An off-set net-force is directed in one way
If you double the mass of an object what happens to the acceleration?
acceleration is halved
If you double the force of an object what happens to the acceleration?
acceleration would double
An object's resistance to change in motion is dependent solely on what quantity?
mass
Inertia is the resistance to change in motion so inertia depends solely on what?
mass
If you increase the force on an object what happens to the acceleration?
more force means more acceleration
If you use the same force on a less massive object what happens to the acceleration?
more mass means more acceleration
You dribble a basketball while walking on a basketball court. List and describe at least 3 pairs of action-reaction forces in this situation.
-Walking then pushing the moving forward -Dribbling -Basketball is pushed but bounces back
What is the bet force if you start to pull instead of pushing (from the question above)?
10N
Your shopping cart has a mass of 65 kilograms. In order to accelerate the shopping cart down an aisle of 0.3 m/s^2. What force would you need to use or apply to the cart?
19.5 N 65kg * 0.3 m/s^2
Which Law states force is dependent on the mass and acceleration of an object?
2nd Law
You know the mass of an object and the force applied to the object to make it move. Which of Newton's laws of motion will help you calculate the acceleration of the object?
2nd Law
How many newtons of force are represented by the following amount: 3 kg*m/s^2? Justify your answer
3 * (1kg*m/s^2) = 3kg*m/s^2
What law is known as the law of action-reaction?
3rd Law
Which law explains why when you bump into something you fall backwards?
3rd Law
Exercises: When Jane drives to work, she always places her purse on the passenger's seat. By the time she gets to work, her purse has fallen on the floor in the front of the passenger seat. One day, she asks you to explain why this happens in terms of physics. What do you say?
Due to inertia, the object keeps moving forward. Then gravity stops it.
Force is measured in newton (N). A newton is based on base units in the metric system. What is a newton equal to in terms of units of mass and acceleration?
N= kg * m/s^2
PART 2 Restate Newton's first law in terms of acceleration.
Unless a force is applied, acceleration is 0 even if it's not in motion.
You are waiting in line to use the diving board at your local pool. While waiting people dive into the pool from the board, you realize that using a diving board to spring into the air before a dive is a good example of Newton's third law of motion. Explain how a diving board illustrates Newton's third law of motion.
When a diving board is pushed down it will spring up in the opposite direction.
What causes an object to slow down on speed-up?
the mass or force