test1
Force is a vector quantity because it has:
magnitude and direction
Ten seconds after starting from rest, a freely falling object (g=10m/s2) will ahve a speed of about:
100m/s
A 10-kg brick and a 1-kg brick are dropped in a vacuum. The force of gravity on the 10-kg brick is:
10 times as much as the force on the 1kg brick
A man weighing 800N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is:
400N
Starting from rest, the distance a freely falling object (g=1m/s2, and d=1/2gt2)will fall in 10 seconds is:
500m
A 10N falling object encounters 4N of air resistance. The magnitude of the net force on the object is:
6N
A block is dragged without acceleration in a straight-line path a cross a level surface by a force of 6N. What is the force of friction between the block and the surface?
6N
The property of things to resist changes in state of motion is called:
inertia
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
A measure of how fast something is moving is called:
speed
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
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 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 average speed of a horse that gallops a distance of 10km in a time of 30 minutes:
20km/hr
Every object possesses inertia
True
Friction is the resistive force that opposes motion or attempted motion of an object.
True
In the absence of friction, no force is required to keep a horizontally moving object moving.
True
In vacuum, the acceleration of a free falling feather and stone is equal.
True
The rate of change of velocity with time (in magnitude, direction or both)is called:
acceleration
When you stand at rest on a pair of bathroom scales, the readings on the scales will always:
add equal to your weight
Which one has zero acceleration? An object
all of the above
The resistive force of friction occurs for:
all of these
If an object's mass is increase, while a constant force is applied to the object, its acceleration:
decreases
It is simply stated as a push or a pull.
force
Motion under the influence of gravitational pull only is called:
free fall
Space occupied by a given mass is called:
volume
The force required to maintain an object at constant velocity in free space is equal to
zero
When a falling object has reached its terminal velocity, its acceleration is:
zero
Action and reaction forces are equal in strength and opposite in direction.
True
What is the acceleration of a car that maintains a constant velocity of 100 km/hr for 10 seconds?
0
Acceleration is the rate of change of distance per unit time.
False
An object in motion comes to a stop without any external force.
False
Force is always expressed as a push, but not as a pull.
False
Force of interaction indicates that, when you push an object, the object will pull you.
False
If the same force is applied on different masses, the one with the larger mass will have a high acceleration.
False
In a freefalling object, terminal speed is attained when the force of gravity and air resistance are equal.
False
In the same locality, the ratio of force to mass results in the same gravitational acceleration.
False
Inertia is the quantity of matter in an object.
False
Mass is the resistance of an object to a change in state of motion.
False
Terminal speed is the speed at which the acceleration of a falling object terminates when air resistance balances its weight.
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 matter an object contains.
False
When a falling object attains terminal velocity, gravitational acceleration will be the highest.
False
When the mass of an object is decreased while a constant force is applied on it, the acceleration of the object decreases.
False
Acceleration is the resistance of an object to a change in state of motion.
False (inertia)
Motion under the influence of gravitational force only is called free fall.
True