Newton's First Law:
Inertia
Inertia
What is the definition of Inertia?
An object at rest stays at rest. An object in motion stays in motion.
What is the equation for acceleration?
F = ma
What does Newton's third law state?
Any action force has an equal and opposite reaction.
What is the difference between acceleration and velocity?
Acceleration when either the speed or direction (or both) change
Velocity is the speed and direction of an object.
You and your friend are in a race. Your friend is carrying a heavy box while you are carrying an empty one. You win the race. Why?
The empty box has less mass than the heavy one, which makes it easier to move.
Which of the following is an object at rest?
A) rock
B) skateboard going 5 mph
C) none of the above
A) rock
What does Newton's second law describe?
The relationship between acceleration and mass of an object when an unbalanced force is applied to the object.
One person is moving a cart full of heavy boxes, and it does not move. Another person comes and now the cart is being pushed by two people. How does the motion of the cart change when more than one person is pushing it?
Applying more force to an object means the speed of the object will increase.
If you want to increase the acceleration of a baseball when you throw it, what must you increase to make this happen?
Force
What year did Isaac Newton publish the First Law of Motion? (Hint: Late 1600's)
1686
According to Newton's second law, increasing the force applied to an object results in...
Increasing the objects speed.
Whenever object A exerts a force on object B, object B exerts a force of the same magnitude on object A, but in the opposite direction. Is this statement
a) always true?
b) sometimes true?
c) never true?
A) always true!!
Good luck next time if you got it wrong!
A baseball player hits a ball. The action force is the force of the ball on the bat. What is the reaction force?
The force of the bat on the ball.
Two ice skaters push off of each other and they both glide in opposite directions. Which of Newton's Laws does this best represent?
Newton's 3rd Law
An object at rest stays at rest, and an object in motion stays in motion unless...
An unbalanced force acts on it.
A bowling ball collides with a set of bowling pins (at rest) with a force of 15N. What is the force the pins exert on the bowling ball?
15N
When a 7 kg bowling ball collides with a 1.5 kg bowling pin, the pin’s motion changes more than the bowling ball’s motion. Why does this happen?
the pin has less mass than the ball
When an unbalanced force acts on an object, energy is transferred
Between the interacting objects
What is the energy of a moving object?
Kinetic energy
Fill in the blanks
When the golf ball is at rest on the tee, the forces on the ball are 1. ___. When the golf club strikes the ball, the forces on the ball become 2. ___ and the ball begins moving in the same direction as the force form the club. As the ball travels through the air, the 3. ___ force of gravity causes the motion of the ball to change.
1. balanced
2. unbalanced
3. unbalanced
What are is the equation for acceleration, force, and mass?
acceleration- a = F/m
force- F = ma
mass- m = F/a
As a ball falls, the action force is the gravitational pull of the Earth’s mass on the ball. What is the reaction to this force?
a) Air resistance acting against the ball
b) The acceleration of the ball
c) The gravitational pull of the ball on the Earth
d) Non-existent in this c
C) the gravirational pull of the ball on the Earth
The classes are playing tug of war. Mrs. Raghavendra’s homeroom pulls with a force of 20N. Ms. Burke’s homeroom pulls with a force of 50 N in the opposite direction. What is the net force? And who won?
The net force is 30N and Ms.Burke’s homeroom won!!
At the instant that the unfortunate mosquito splatters against the windscreen of a moving car, how does the deceleration of the car compare to the deceleration of the mosquito?
A)The car experiences a greater deceleration
B) The car experiences a smaller deceleration
C) The car experiences the same deceleration
D) More information needed
B) The car experiences a smaller deceleration
The force on rush object is of the same magnitude, so the object of greater mass (the car) will have a smaller acceleration(Newton‘s second law)