Newton's 2nd law of motion
Equation for Newton's 2nd law
f=ma
5 Newtons are being applied to the right, and 2 newtons are being applied to the left. Will the object move and if so, in which direction?
The object will move to the right
Newton's 3rd law of motion states for every action there is an __ __ __ reaction
equal and opposite
What is newtons first law?
An object will stay in a motionless state unless acted on by another force or in motion.
what is net force
the total resulting amount of force on a object
The same force is applied to two objects. Object A accelerates 85 m/s2 and Object B accelerates 70 m/s2. Which object has the lower mass?
Object A, since it accelerates faster it must have a lower mass.
23 Newtons are being applied to the right, and 9 newtons are being applied to the left. Will the object move, and if so in which direction?
The object will move to the right.
What force acts on objects in contact with each other and can cause an object to slow down or stop moving?
Friction
True or false : If you hit a curb on a skateboard you will go flying , the board will not.
True
If a person pushes a box with a force of 5 newtons right and a person pushes left with a force of 15 newtons what is the net force?
10 newtons left
What is the force needed to get a 9 kg object to accelerate 42 m/s2?
F=ma= 9 x 42 = 378 N
5 Newtons are being applied to the right, and 5 newtons are being applied to the left. Will the object move, and if so, in which direction?
it won't move
A soccer player kicks a ball, exerting 50 N of force on it. How much force does the ball exert back on the player’s foot?
50N Equal and opposite
A hockey puck slides much farther on ice than on grass because ice has less of this force slowing it down.
What is friction?
If a person pushes a box with a force of 10 newtons right and a person pushes left with a force of 10 newtons what is the net force?
0 Newtons
I use the same amount of force to roll a bowling ball and a ping pong ball. Which will accelerate more?
The ping pong ball, since it has a smaller mass.
1/5 Newtons are being applied to the right, and 1/2 newtons are being applied to the left. Will the object move, and if so in which direction?
it will go left
If a bug hits a car windshield while the car is moving, both the bug and the car experience the same force. But the bug is crushed while the car is barely affected. Why?
the bug has less mass, so it experiences a much greater acceleration
What is another name for Newtons first law of motion?
Inertia
If a person pushes a box with a force of 492 newtons right and a person pushes left with a force of 378 newtons what is the net force?
114 newtons right
Mike's car, which weighs 1,000 kg, is out of gas. Mike is trying to push the car to a gas station, and he makes the car go 0.05 m/s2. Compute how much force Mike is applying to the car
F=ma = 1000 x 0.05 = 50 Newtons
.78 Newtons are being applied to the right, and .7 newtons are being applied to the left. Will the object move, and if so, in which direction?
it will go right
A rocket moves upward because burning fuel is expelled downward. What is the name of the reaction force that lifts the rocket?
thrust
In space, a moving object will continue moving forever in the same direction at the same speed unless acted upon by a force. Why?
There is no matter, which means no friction, in space
If a person pushes a box with a force of 15 newtons right and a person pulls right with a force of 15 newtons what is the net force?
30 newtons right