PHYSC 100 Test One
The amount of friction that occurs when two material surfaces slide against each other depends on:
-The stickiness of atoms on their surfaces -How much they are pressed together
The gain in speed each second for a freely falling object is about:
10m/s
It is simply stated as a push or a pull:
A Force
Disregarding air resistance, objects fall at constant:
Acceleration
If the mass of an object does not change, a constant net force on the object produces a constant:
Acceleration
The rate of change of velocity with time (in magnitude, direction, or both) is called:
Acceleration
Which one requires more work: lifting a 50kg sack vertically 2m or lifting a 25kg sack vertically 4m?
Both require the same amount of work.
If an object's mass is increased, while a constant force is applied to the object, its acceleration:
Decreases
A coin and a feather dropped in a vacuum will have the same momentum.
False
Acceleration ids the rate of change of distance per unit time.
False
An object at rest has kinetic energy.
False
An object in motion comes to a stop without any external force:
False
Density is the amount of matter in a substance
False
Escape speed from a planet decreases with increase in the mass of the planet.
False
Every 8000 meters, the surface of the Earth drops an approximate vertical distance of 20 meters.
False
Force of impact of a falling object could be reduced by reducing the time over which the force acts.
False
If you do work on an object in ahlf the time, your power output is also half the usual power.
False
Kinetic energy is energy of an object because of its location.
False
The greater the distance from the center of the Earth, the greater will be the weight of an object.
False
The greater the distance from the center of the Earth, the greater will be the weiight of an object.
False
The horizontal speed of a projectile is influenced by gravity.
False
The law of inertia holds true only for objects in motion, but not for those at rest.
False
The weight of a given object is the same on Earth and on the Moon.
False
Volume indicates how much mass an object contains.
False
Work is the product of force and time.
False
A state of fall under the influence of gravity (free from air resistance) is called:
Free Fall
Motion under the influence of gravitational pull only is called:
Free Fall
The resistive force that opposes motion or attempted motion of an object is called:
Friction
One object that has twice as much mass as another object also has as much:
Gravitational Acceleration
The property of things to resist changes in state of motion is called:
Inertia
Compared with 1kg block of solid iron, a 2kg block of solid iron has twice as much:
Inertia, Mass, and Volume
Whenever the net force on an object is zero, its acceleration:
Is Zero
Force is a vector quantity because it has:
Magnitude and Direction
A kilogram is a measure of an object's:
Mass
An object maintains its state of motion because it has:
Mass
A falling object that has reached its terminal speed continues to gain:
Neither speed nor acceleration
The force exerted on the tires of a car to directly accelerate it along the road is exerted by the:
Road
A measure of how fast something is moving is called:
Speed
The force that supports an object against gravity, often called the normal force, is also known as:
Support Force
The speed at which the acceleration of a falling object terminates when air resistance balances its weight is called:
Terminal Velocity
Compared with the same mass of a certain object on Earth, the mass of the same object on the Moon is:
The Same
Your weight is:
The gravitational attraction between you and the Earth
A coin and a feather dropped in a vacuum fall at equal acceleration.
True
An astronaut in orbit feels weightless.
True
An earth satellite is simply a projectile freely falling around the Earth.
True
An object that has kinetic energy must be moving.
True
Every object possesses inertia.
True
If two objects of different masses roll down a slope at the same velocity, the one with the large mass will have a higher momentum.
True
If you double the velocity of a moving object with constant mass, its momentum will double.
True
Impulse is the product of force and time.
True
In a vacuum, the acceleration of a free falling stone and feather is equal
True
In circular orbit, the speed of a satellite is the same everywhere.
True
In elliptical orbit, the satellite's speed and distance from the center of the Earth are different at different points.
True
In the absence of friction, no force is required to keep a horizontally moving object moving.
True
Potential energy is energy of an object because of its location.
True
The Moon is simply a projectile circling the Earth.
True
The escape speed fro Jupiter is higher than from that of Earth.
True
The higher the mass of an object, the higher becomes its inertia
True
The horizontal speed of a projectile is not affected by gravity.
True
The mass of a given object is the same on Earth and on the Moon.
True
The ratio of gravitational force (F)to mass (m) is the same for all objects in the same locality.
True
The weight of an object is higher on Earth than on the Moon
True
Weight is a gravitational force exerted on an object
True
When acceleration is "g", it is a free fall.
True
Without net force there no acceleration
True
The property which specifies the speed and direction of motion an object is called:
Velocity
As an object freely falls, its:
Velocity Increases
Space occupied by a given mass is called:
Volume
The force due to gravity is called:
Weight
The force required to maintain an object at constant velocity in free space is equal to:
Zero
When a falling object reaches its terminal velocity, its acceleration is:
Zero
A bullet fired from a rifle begins to fall:
as soon as it leaves the rifle
Earth satellites are typically more than 100km high, so as to be above the Earth's:
atmosphere
In the vacuum of outer space, there is no:
atmospheric pressure
Whereas impulse involves the time a force acts, work involves the:
distance that a force acts
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is:
doubled
The critical speed at which a projectile outruns gravity is called:
escape speed
If the mass of the Earth somehow increased with no change in radius, your weight would:
increase
Two objects move towards each other because of gravity. As the objects get closer, the force between them:
increases
A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level, compared to its initial speed is:
less
An object that has potential energy may have this energy because of its:
location
When you are in the way of a fast moving object and can't get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a:
long time
Compared to the period of satellites in orbit closer to the Earth, the period of satellites in orbit far from the Earth is:
longer
From Earth, one satellite appears to overtake another. The faster satellite is:
lower
An object that has kinetic energy must be:
moving
An Earth satellite is in an elliptical orbit. The satellite travels faster when it is:
nearest to the Earth
Any object that moves through the air or through space under the influence of gravity is called:
projectile
As a ball falls, the action force is the pull of the Earth's mass on the ball. The reaction force is the:
pull of the ball's mass on the Earth
If you push an object, the object:
pushes you back
When an object falls through air, its velocity increases and its acceleration:
remains the same
A projectile or small celestial body that orbits a larger celestial body is called:
satellite
A moving object has:
speed, velocity, and momentum
The force that a object exerts on a supporting surface is called:
support force
The attraction of a person's body toward the Earth is called weight. The reaction to this force is:
the person's body pulling on the Earth
Neglecting friction, a large block of ice and a small block of ice start sliding down an incline together. The heavier block will get to the bottom:
the same time as the light block
The speed of the planets about the Sun depends on:
their distance of the planets from the Sun
If you push an object twice as far while applying the same force, you do:
twice as much work
The force that an object exerts on a supporting force (or if suspended, on a supporting string), due to the force of gravity is called:
weight
A feeling encountered in a free fall, wherein a support force is lacking, is called:
weightlessness
