A body is in motion when it _______________ compared to its reference point.
changes its position
100
What happens to the object when its weight is less than the upthrust?
The object floats.
100
What is the name of a push or pull that can deform an object or change its state of rest or motion?
A force.
100
Formula for Work
W = F x d
100
How can we convert m/s to km/h?
Multiply by 3600 and divide by 1000
200
What is the magnitude that represents the change in speed per unit of time?
Acceleration
200
What is the upthrust exerted against a immersed body that displaces an amount of water that weighs 2N?
2N
200
What is the IS unit for Force?
Newtons (N)
200
Formula for Force
F = m x a
200
What units must be used to calculate forces, weights or upthrusts?
Kg, cm^3 or L, N, m/s^2
300
In a distance-time graph the represented motion is a horizontal line... What does this mean?
No movement. v=0
300
Name an example in nature of the Archimedes' Buoyancy Principle.
Air sacs in birds. Air bladder in fish.
300
What kind of force does a magnet exert when it attracts a piece of metal?
non-contact force
300
What is the formula for calculating density?
d = m/v
300
How can weight be calculated using the substance's density value instead of its mass?
w = m · g = d · V · g
400
Objects have ____________ energy when they move at a certain speed or are displaced with respect to their position of equilibrium.
mechanical
400
What is the apparent weight of a 15N body that experiences an upthrust of 5N?
10N
400
Newton's Second Law states that a force exerted on an object gives it a constant acceleration inversely proportional to the object's _____________.
mass
400
Formula for Gravitational Potential Energy
Ep = m · g · h
400
What distance has been covered in 15 minutes if a resting object starts moving with a constant 2 m/s2 acceleration?
810000 m = 810 km
500
What does it mean if the movement represented in a space-time graph produces a curved line (parabola)?
The movement is accelerated, not constant.
500
Stat the Archimedes Principle
An object submerged in a liquid experiences a force that tried to push it upwards. This upthrust equals the weight of the volume of the displaced liquid.
500
State Newton's First Law
An object in motion, on which no forces act, has uniform rectilinear motion or stays at rest.
500
What is the formula for space in a UARM that was not at rest?
s = Vo · t + 1/2 · a · t^2
500
Calculate the potential energy of a body with 100g of mass situated at 30m height.