Motion
This happens to an object when it has positive acceleration.
What is speeding up?
A push or a pull exerted on an object is called this.
What is Force?
An apple is falling from a tree. The apple's speed increases as it falls. How does the apple's motion affect its mechanical energy AND kinetic energy?
Mechanical energy remains the same and its kinetic energy increases.
A baseball thrown into the air will continue on its path until which force acts upon it.
What is friction and/or gravity?
. A pumpkin is launched from the ground at an angle of 40 degrees above the horizon with a total speed of 60 m/s. Ideally (with no air resistance) the pumpkin will land on the ground with a total speed of
60m/s
When analyzing the motion of a projectile the most important concept to understand
Horizontal component of velocity is independent of vertical component of velocity
Holiday and JB Marley push the cart with the same amount of force.
What kind of force is this?
BALANCED
Only the vertical velocity of a projectile is affected by
the force of gravity
The force of gravity acts on an object that has this.
What is Mass?
This is the speed of an object in a specific direction.
What is Velocity?
A student is riding her bike on the road with a combined mass of 80 kg bicyclist. She is trying to determine how much force is needed to start her bike moving
What is Static Friction
. An object projected at angle has an initial velocity v0. The horizontal component of the projectile’s velocity ___________ over time
Constant
DOUBLE POINTS
STATE THE 1st LAW of MOTION - give an example
An object at rest remains at rest. An object in motion goes at a constant speed until an outside force acts upon it.
Find the average of the following 3 roller coaster trials: 1.5 sec., 2 sec, 1.75 sec.
1.75 sec.
An arrow is fired horizontally, directly at the bulls-eye of a target 60
m away. The arrow leaves the bow with a velocity 310 m/s. The arrow land below, above or at the bull's eye
Below
In absence of acceleration, a moving object has a constant this.
What is velocity?
Newton's First Law of Motion is also called
What is "Law of Inertia"
What is the formula for calculating speed?
Speed = Distance / Time
The force that pulls a falling leaf towards earth is called this.
What is Gravity?
A cannonball is fired into frictionless space. The amount of force needed to keep it going equals
Zero since no force is needed to keep it moving
What is the 2nd law of motion?
DOUBLE POINTS - GIVE AN EXAMPLE
FORCE=MASS X ACCELERATION
I kicked the wall with my foot - what happens and which law does that represent?
It will hurt because of the 3rd law - The wall will push back against my foot. It is an equal and opposite reaction
A stone thrown from a bridge 20.0 m above a river with an initial velocity of 12.0 m/s at an upward angle of 45.0°.
What is the vertical velocity at the maximum height
A toy car is released at the top of an INCLINED PLANE. How does its energy change as it rolls down?
Its Kinetic Energy Increases, and it's potential energy decreases.
The tendency of an object to resist a change in its motion is known as this.
What is Inertia?
Energy moves from one object to another
energy transfer
The force that is applied to an object by a person is called this.
What is Applied force?
A 4.7 kg cart is rolling down a ramp. Neglecting any friction and drag from impending motion the perpendicular force acting at the point of contact
what is Normal Force
What is the 3rd LAW of Motion?
DOUBLE POINTS - GIVE AN EXAMPLE
For every action there is an equal an opposite reaction!
A roller coaster moving at the bottom of a big hill has what kind of energy
KINETIC
A cliff has a vertical height of 430 meters. Assume that the ball leaves
the club at an angle of 30° and is traveling 24 m/s
What is the final velocity of the ball just before it hits the ground
Moving parts in machinery are coated in oil and grease to reduce this.
What is Friction?
Which forces are not acting on the pendulum swinging in a moving car?
Normal Force
The rate of change in the velocity of an object is called this.
What is Acceleration?
Energy changes form within a system
energy transformation
The acceleration of a projectile is
9.8 m/s2
What does the law of conservation of energy state?
Energy cannot be created nor destroyed; only transferred from one object to another.
If a roller coaster is traveling 70 miles every 4 hours, what is the average speed?
17.5 miles per hour
A firefighter stands on a cliff overlooking a valley where a raging wildfire has started. If she is on a 25 m cliff and starts the water hose with a velocity of 19 m/s at an angle of 35 degrees, how are v0x and v0y calculated?
Use cos for horizontal velocity component and sin for vertical velocity component.