Chapter 4 Physics
A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car?
1500 kg
An apple at rest weighs 1 N. The net force on the apple when it is in free fall is...
1 N
The force of friction in a sliding object is 10 Newton's. The applied force needed to maintain a constant velocity is...
10 N
A girl pulls on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration in meters per second per second?
3.0
A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is...
300 N upward
An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The magnitude of the resultant force on the object is...
5 N
A skydiver, who weighs 500 N, reaches terminal velocity of 90 km/h. The air resistance on the diver is then...
500 N
When a women stands at rest with both feet on a scale, it reads 500 N. When she gently lifts one foot, the scale reads...
500 N
A block is drafted without acceleration in a straight-line path across a level surface by a force of 6 N. What is the force of friction between the block and the surface?
6 N
A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is...
400 N
A 10-N falling object encounters 4 N of air resistance. the net force on the object is...
6 N
A 10-N falling object encounters 10 N of air resistance. The net force on the object is...
0 N
A bag of groceries has a mass of 10 kilograms and a weight of...
Abut 100 N
Hang from a pair of gym rings and the upward support forces of the rings will always...
Add up to equal your weight
Which has the greater mass...
An automobile battery
Your car is coasting on level ground at 60 km/h and you apply the brakes until the car slows to 40 km/h. If you suddenly release the brakes now, the car tends to...
Continue moving at 40 km/h
Suppose a particle is being accelerated through space by a 10xN force. Suddenly the particle encounters a second force of 10 N 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.
A skydiver mumps from a high-flying plane. As her velocity of fall increases, her acceleration...
Decreases
The newton is a unit of...
Force
A large and a small person wish to parachute at equal terminal velocities. The larger person will have to...
Get a larger parachute
A coconut and a feather fall from a tree through the air to the ground below. The amount of air-resistance force is...
Greater on the coconut
Two tennis balls fall through the air from a tall building. One of them is filled with lead pellets. The ball to reach the ground first is the...
Lead-filled ball
A ball is thrown vertically into the air. Because of air resistance, it's speed when it returns to its starting level compared with its initial speed is...
Less
A force is a vector quantity because it has both...
Magnitude and direction
A kilogram is a measure of an object's...
Mass
An object's weight may properly be expressed in units of...
Newtons
Two factors that greatly affect air resistance on falling objects are the...
Size and speed of the object
Your weight is...
The gravitational attraction force between you and the Earth.
A light women and a heavy man jump from an airplane at the same time and open their same-size parachute at the same time. Which person will get to a state of zero acceleration first?
The light women
Compared to the mass of a certain object on Earth, the mass of the same object on the moon is...
The same
When a falling object ha reached its terminal velocity, it's acceleration is...
Zero
An Apple weighs 1 N, when held at rest above your head, the net force on the apple is...
0 N
A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What is the magnitude of the net force exerted on the car?
2000 N
An object following a straight-line path at constant speed...
Has zero acceleration
A skydiver's terminal velocity will be greatest if she falls...
Head first
A heavy rock and a light rock of the same size are falling through the air from a tall building. The one that encounters the greatest air resistance is the..
Heavy rock
A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension...
Increases
If one object has twice as much mass as another object, it also has twice as much...
Inertia
A skydiver steps from a helicopter and falls for a few seconds until he reaches his terminal velocity. Thereafter, until he opens his parachute, his acceleration...
Is zero
Whenever the net force on an object is zero, its acceleration...
Is zero
An object is propelled long a straight-line path by a force. If the net force were doubled, the object's acceleration would be...
Twice as much