Gravity
An object is falling at its _____________ ,if it falls at a constant velocity.
Terminal Velocity
Newtons 1st law of motion is also called?
The Law of Inertia
The relationship between an object’s acceleration and its mass and force acting on it is known as?
Newton’s second law of motion
For every action there is an _________ and opposite reaction.
Equal
The formula to calculate momentum is P= m x ______
Velocity
_____________ is the path that a thrown object follows
Projectile Motion
An object in motion has ___________, so it tends to stay in motion.
Inertia
If you pushed a full shopping cart with little force would the acceleration be large or small?
Small acceleration
When you jump up in the air what is the action force?
Your feet pushing on the ground.
When a moving object hits another object some or all of the momentum of the first object is transferred to the object hit. This is known as what law? _________________
The Law of Conservation of Momentum
____________ occurs when air resistance does not affect the motion of a falling object.
Free Fall
Newton’s first law only applies to objects that are not moving. True or False?
False
objects that are not moving and moving objects
If you wanted to increase the acceleration of a wagon full of bricks you would have to _____ it’s mass.
Decrease it’s mass
When you jump up in the air, what is the reaction force?
The ground pushing back on your feet.
The more momentum an object has the ___________it is to stop the object or change its direction.
harder
A bowling ball and a baseball are dropped at the same time from the same height which hits the ground first? (Assuming there is no air resistance)
They would hit at the same time.
Why can friction make observing Newton’s first law of motion difficult?
Because friction slows the motion of moving objects so you don’t see objects moving forever in a straight line.
According to Newton’s second law of motion, Force = mass x _________
Acceleration
When you jump forward off a raft which direction will the raft travel?
Backwards
In a head on collision, the combined objects move in the direction of the object that had the _____________ momentum.
greater
Mrs. Mendelson is standing on a high cliff. She dives into the lake below and strike the water after 3 s. What is Mrs. Mendelson’s velocity when she hits the water?
9.8 m/s x 3 s = 29.4 m/s
What would cause an object at rest to move or a moving object to not travel in a straight line?
An unbalanced force
What is the force needed by a speedboat that pulls a 50 kg water-skier who is accelerating at 2.0 m/s squared?
100 Newtons
If you drop your pencil, gravity pull the pencil toward Earth. This is the action force. The reaction force is the gravity of the pencil pulling Earth upward. Why don’t we see this movement?
Mass of the Earth is much larger than the mass of the pencil so the acceleration of the Earth is very small.
What is the momentum of a 6 kg bowling ball that is moving at 10 m/s down the alley toward the pins?
60 kg . m/s down the alley