Newton's Laws of Motion
Terms in this set (55)
Which law is associated with inertia?
Newton's First Law
If you increase the force on an object what happens to the acceleration?
The acceleration increases by the same amount
If you use the same force on a less massive object what happens to the acceleration?
The acceleration increases by the reciprocal amount
Which law states force is dependent on the mass and acceleration of an object?
Newton's Second Law
What causes an object to slow down or speed up?
An unbalanced force
Which law is known as the law of action-reaction?
Newton's Third Law
Which law explains why when you bump into something you fall backwards?
Newton's Third Law
If you double the force of an object what happens to the acceleration?
The acceleration is doubled
If you double the mass of an object what happens to the acceleration?
The acceleration is cut in half
Force is measured in newtons (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 x m/s^2
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 front of the passenger seat. One day, she asks you to explain why this happens in term of physics. What do you say?
Purse moves forward and will keep moving forward because there is no unbalanced force to stop it. It keeps moving forward until it hits the floor. (Newton's First Law)
You are waiting in line to use the diving board at your local pool. While watching 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 this.
You push down on the board, and the board pushes back on you. Since you have less mass (inertia) you move up.
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?
Newton's Second Law (F=ma)
You dribble a basketball while walking on the basketball court. List 3 pairs of action-reaction forces.
1. You push on the ball and the ball pushes on your hand
2. The ball hits the ground and the ground pushes back on the ball
3. You walk on the ground with your feet and the ground pushes back on you
Restate Newton's first law in terms of acceleration.
An object with no acceleration remains as is until an unbalanced force acts on it.
If the forces are balanced what is the resulting acceleration?
No acceleration (0 m/s^2)
An object's resistance to change in motion is dependent solely on what quantity?
The amount of mass in an object or inertia
Inertia is the resistance to change in motion so inertia depends solely on what?
The mass of an object
What is required to cause acceleration?
An unbalanced force
What is the net force if you push a cart to the right with 5N of force a friend pushes the cart to the left with 5N of force?
0N (No net force)
Imagine a place in the cosmos far from all gravitational forces and frictional influences. Suppose that you throw a rock in this place. What will the rock do and why?
The rock will keep moving in a straight line forever because there is no gravitational pull to stop it.
Suppose you were in space in a weightless environment, would it require a force to set an object in motion?
Yes, objects still have inertia and resist the change in motion.
Why doesn't a ball roll on forever after being kicked at a soccer game?
The ball stays in motion until acted on a by a force, which is the ground and also because of friction which causes the ball to slow down to a stop.
What two variables is acceleration dependent on? What is the relationship between these variables and acceleration?
Acceleration is dependent on mass and force. If force increases acceleration increases. If acceleration increases force increases. If acceleration increases mass decreases. If mass increases acceleration decreases.
If an object is not accelerating what can you determine about the sum of all the forces on the object?
They are all unbalanced or zero
If the net force on an object is in a negative direction, what will the direction of the resulting acceleration be?
They will be going in the same negative direction.
If you double the net force on an object what is the result of the acceleration?
The acceleration will double
If you double the mas of an object while leaving the net force unchanged what is the result on the acceleration?
The acceleration decreases by cutting in half
All forces result because of ______________ between objects.
Forces come in pairs? What are they called?
Equal and opposite action-reaction force pairs
While driving down the road, a fly strikes the windshield of a bus and makes a quite obvious mess in front of the face of the driver. This is a clear case of Newton's third law because the fly hit the bus and the bus hits the fly. Which of the two forces is greater: the force on the fly or the force on the bus?
the force between the fly and the bus is equal. The fly has a greater acceleration even though it has a smaller mass, but the bus has a larger mass and less acceleration. They cancel out.
A climber pulls down on a rope causing his body to lift upward and rise up along the rope.
Force= Mass x Acceleration
Two bumper cars collide into each other and each car jolts backwards.
When you give your friend a life on your bike you have to pedal harder and faster to keep the same speed (and acceleration) as you had before when you were on the bike alone.
For every action there is an equal and opposite reaction.
A smaller cannon ball leaves a cannon much faster than a larger, heavier cannon ball fired from the same cannon.
When you are standing in a subway train, and the train suddenly stops, your body continues to go forward.
An object at rest/motion will stay at rest/motion unless acted on by an outside, unbalanced force.
It is much easier to carry your backpack when it is empty rather than when it's full of textbooks.
A boy is going down a slide. As he reaches the bottom, friction causes him to slow down and stop.
As the wheels of a drag racing car smoke and spin backwards, they eventually begin to grip the race track and push backwards on the road. In turn, the road reacts by pushing the wheels forward.
When you throw a bowling ball out of a canoe, the bowling ball moves forward and the canoe moves backward.
A little girl who has been pulling a sled behind her in the snow is crying because when she stopped to tie her shoe, the sled kept moving and hit her in the back of the leg.
A grocery cart is sitting motionless in the parking lot at Wal-Mart. you decide to jump in and your friend pushes you.
A basketball sits in the ball cage in the gym. It remains motionless.
Newton's first law of motion is also known as the Law of ________.
Newton's first law says that an object that is NOT MOVING, or is at _______, will stay at ________, and an object that is MOVING will keep moving with constant _________, which means at the same _________ and in the same ____________, unless an ____________ force acts on that object.
Newton's second law of motion is also known as ______.
Newton's second law says that when an ______________ force is applied to an ____________, it causes it to _____________. The greater the fore that is applied, the ____________ the acceleration. The lesser the force that is applied, the ____________ the acceleration. If the same force is applied to an object with a large mass, it will have a ___________ acceleration. If the same force is applied to an object with a small mass, it will have a ___________ acceleration.
Newton's third law says that every time there is an ________ force, there is also a __________ force that is _________ in size and acts in the ___________ direction.
Newton's third law states that forces must ALWAYS occur in ______.
Your bottom pushing on your desk seat...
Your desk seat pushing on your bottom
A bat hitting a baseball...
The baseball hitting the bat
Your finger pressing on your phone screen while texting...
The screen pressing on your finger
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