Science chapter 3
A 10N object encounters 4N of air resistance. The net force on the object is
6N
The force of friction on a sliding object is 10N. The applied force needed to maintain a constant velocity is
10N
A tow truck exerts a force of 3000N on a car, accelerating at 2m/s/s what's the mass of the car?
1500kg
A 10N falling object encounters 10N of air resistance. The net force on the object is
0N
An apple weighs 1N when held at rest above your head the net force on the apple is
0N
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
A skydiver, who weighs 500N reaches terminal velocity of 90km/h the air resistance on the diver is then
500N
When a woman stands at rest with both feet on the scales, it reads 500N. When she lifts one foot the scale reads
500N
An object is pulled north by a force of 10N and at the same time another force of 15N pulls it south, the magnitude of the resultant force on the object is
5N
A block is dragged without acceleration in a straight line path across a level surface by a force of 6N what is the force of friction between the block and the surface
6N
A 1kg mass at the earths surface weighs
9.8N
An object is propelled along a straight line path by a force. If the net force were doubled,the acceleration would be
Twice as much
A jumbo jet has a mass of 100,000kg the thrust for each of its four engines is 50,000N. What is the jets acceleration in m/s/s when taking off
2
A car has a mass of 1000kg and accelerates at 2 m/s/s. What is the magnitude of the net force exerted on the car
2000N
A car traveling at 22m/s comes to an abrupt stop in 0.1 seconds when it hits a tree. What is the de acceleration in m/s/s of the car
220
If an objects mass is decreasing while a constant force is applied to the object, the acceleration
Increases
If one object has twice as much mass as another object, it also has twice as much
Inertia
Compared to a 1kg block of solid iron, a 2kg block of solid iron has twice as much
Inertia, mass, volume
A rock is thrown vertically into the air, at the top of its path, it's acceleration in m/s/s
Is 9.8
A force is a vector quantity because it has both
Magnitude and direction
A kilo gram is a measure of an objects
Mass
An objects weight may properly be expressed in units of
Newtons
A 10kg block is pushed across a horizontal surface with a horizontal force of 20N against a friction force of 10N. The acceleration of the block in m/s/s is
1
A sack of potatoes weighing 200N falls from an air plane. As the velocity of the fall increases, air resistance also increases. When air resistance equals 200N and the sack acceleration in m/s/s is
0
A 10kg brick and a 1kg book are dropped in a vacuum. The force of gravity on the 10kg brick is
10 times as much
A 500N parachutist opens his chute and experiences an air resistance force of 800N, the net force on the parachute
300N upward
A sky diver with a mass of 100kg experiences air resistance of 500N and acceleration of
About 0.5g
A bag of groceries has a mass of 10kg and a weight of
About 100N
A sky diver jumps from a high flying plane. As her velocity of fall increases her acceleration
Decreases
Your weight is
The gravitational attraction force between you & the earth
Compared to the mass of a certain object on earth, the mass of the same object on the moon is
The same
The sky diver steps from a helicopter and falls for a few seconds until her reaches his terminal velocity. Thereafter until he opens his parachute his acceleration is
0
If you are driving at 20m/s and slam on the breaks and skid at 0.5g to a full stop, the skidding time in seconds is
About 4
The human body can, under certain conditions, withstand an acceleration of 10g. What net force would produce this acceleration of a 50kg person
About 5000N
If a net object of constant mass experiences a constant force, it will have a constant
Acceleration
If the mass of an object doesn't change, a constant net force on the object produces at constant
Acceleration
Hang from a pair of gym rings and the upwards support forces of the rings will
Always add up to your equal weight
Which has 0 acceleration
At rest, moving at a constant velocity in mechanical equilibrium
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
At the same time as the light block
Whenever the net force on an object is 0 it's acceleration is
At zero
Science
Chapter 3
Suppose a particle is being accelerated thru space by a 10N force. Suddenly the particle encounters a second force of 10N in the opposite direction from the first force the particle with both forces acting on it
Continues at the speed it had when it encountered the second force
The newton is a unit of
Force
An object following a straight line path at a constant speed
Has 0 acceleration
A skydivers terminal velocity will be greatest if she falls
Head first
Two objects of the same size but unequal weights are dropped from a tall tower. Taking air resistance into consideration the object to hit the ground first will be
Heavier object
In which case would you have the largest mass of gold? If your chunk of gold weighed 1N on the
Moon
Two factors that greater affect air resistance on falling objects are the
Size and speed of the object
A rock weighs 30N on earth.a second rock weighs 30N on the moon. Which of the two rocks has the greater mass?
The one on the moon
A force of 1N accelerates a mass of 1kg at the rate of 1m/s^2. The acceleration of a mass of 2kg acted upon by a net force of 2N is
The same
When a falling object has reached its terminal velocity, it's acceleration is
Zero