Newton's Laws
What is Newton's 1st Law?
Objects at rest stay at rest, objects in motion stay in motion unless acted on by a net force.
What is the formula for Speed?
Speed = Distance / Time
What is the force that pulls objects down towards the earth?
Gravity
If an object has 3N of force pushing from the right and 3N of force pushing from the left, what does the acceleration of that object look like.
The forces are balanced therefore no acceleration.
What is the equal and opposite reaction to the following?
A baseball pushes backward on the bat
The bat pushes the ball forward
What is Newton's 2nd Law?
Force = Mass x Acceleration
What is the difference between speed and velocity?
Velocity has a given direction
What is NOT an example of a force?
a) Push
b) Pull
c) Gravity
d) Energy
e) Friction
d) Energy
What is the equal and opposite reaction to the following:
Gravity pulls a student towards their chair
The chair pushes the student upward
T/F We wear seat belts in a moving car because of Newton 2nd Law which states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force.
False, Newton's 1st law
What is Newton's 3rd Law?
For every action there is an equal and opposite reaction
Brandy jogs from Indian Hills Middle School due south toward the Village for 100m. It takes her 25 seconds. What is her velocity?
4m/s South
What is the force caused by air that slows things down?
Air Resistance
An object has 250N of force pulling from the left and 700N of force pushing from the right. What is the net force acting on the object and what direction does it move?
950N Left
What are the three ways to cause acceleration of an object?
Speed up
Slow down
Change direction
Which of Newton's laws is being demonstrated?
A golf ball will continue to roll until friction and gravity stop it.
Newton's 1st law of motion
Connect the following activities to the amount of friction required, high friction or low friction.
sledding, bowling, running, driving, hockey
High: running and driving
Low: sledding, bowling, and hockey
A man needs to know how much force to lift a metal plate of 10 kg, gravity applies an acceleration of 9.8 m/s2
98N
A rocket moves up out of the atmosphere because...
hot gases get accelerated downward in the opposite direction.
An asteroid crashes into the surface of the earth with 800 Newtons of force and an acceleration of 64m/s2, what was the mass of the asteroid?
12.5kg
A girl on rollerblades throws a very heavy ball forward. Per Newton's 3rd law, what are the forces?
She moves backward, and the ball moves forward.
What are speed, velocity, and acceleration measured in? (units/label)
Speed: m/s
Velocity: m/s with a direction
Acceleration: m/s2
Forces always come in ____________?
Pairs
One ship is chasing another. The ship in the front getting chased is shooting their cannons backwards. Should the ship in the back shoot the cannons forward if their goal is to go forward to catch the other ship?
NO, If they shoot the cannonballs forward there is an equal and opposite force pushing their ship backwards.
An object is moving at an a rate of 45m/s2. The force applied to the object was 3,015N. What is the mass of the object?
67kg