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Physics Sem 1 Midterm
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Gravity
Newtons Laws, Forces, Constant Velocity, Acceleration, Vectors, Projectiles
Terms in this set (43)
Newtons 1st Law
An objects motion will not change unless an unbalanced force acts on the object
Newtons 2nd Law
The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
Newtons 3rd Law
For every action there is an equal and opposite reaction
For every action there is an equal and opposite reaction
What is inertia?
tendency of an object to resist change in motion
tendency of an object to resist change in motion
What does inertia related to?
mass
Is inertia a force?
no
force
any push or pull
Which falls with a greater acceleration in a vacuum: an elephant or a mouse?
same
Which falls with a greater force of gravity in a vacuum: an elephant or a mouse?
elephant
Formula for Newtons
kg X m/s^2
If the net force is zero, then the forces acting on the object are ________ and the resulting motion is ___________.
equal, standing still
If the net force is anything other than zero, then the forces acting on object are _____________ and results in ______________
unbalanced; movement
A hammer drives a nail into a piece of wood. What is the action-reaction pair in this situation?
Hammer hits nail, nail hits hammer with same force
The magnitude of the gravitational force acting on an object is called ____________
weight
Friction is a force that typically acts ____________ to the direction of the motion
opposite
If a car hits a bug, who experiences the greater force?
equal amount of force, different consequences
What is the force required to keep a 27 kg object moving at a constant velocity of 5 m/s?
no forces : first law of motion
When all individual forces acting on an object are balanced, it is the natural tendency of an object to _______________
remain at a constant velocity
A net force is exerted on an object toward the north. The object...
may be moving in any direction
Where is the Independent variable written?
X Axis
Where is the dependent variable written?
Y Axis
What is the Y intercept?
where the line crosses the Y Axis
How do you find slope?
y2-y1/x2-x1
What is the equation for a direct linear relationship?
Y=mx+b
If the y-axis has a unit of km and the x axis has units of minutes, what is the derived unit of the slope?
km/min
If the y-axis has a unit of mi/hr and the x-axis has units of Kilograms, what is the derived unit of the slope?
M/PH/S
Velocity
change in displacement over time
Displacement
change in position; how far away from the starting point
Distance
total path length
Scalar
only measures maginitude
Vector
measures magnitude and direction
The slope of a position vs time graph gives...
velocity
The area under a curve in a velocity vs time graph gives...
displacement
Acceleration
The rate at which velocity changes
examples of acceleration
speeding up, slowing down, stopping
Scalar units
time, speed, distance
Vector units
acceleration, velocity, displacement, force
The slope of a velocity vs time graph shows...
acceleration
When slowing down the signs for velocity and acceleration are...
negative
When speeding up, the signs for velocity and acceleration are....
positive
What will affect how fast an object falls in a vacuum?
mass and gravity
What is the acceleration due to gravity?
9.8 m/s2
Where do you aim to hit a falling object?
At the object
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