A student in a lab experiment jumps upward o a common bathroom scale as the lab partner records the scale reading.
What does the lab partner observe during the instant the student pushes off ?
The scale reading will remain unchanged during the entire time the student is in contact with the scale.
The scale reading will increase momentarily then will decrease as the student is moving upward from the scale.
The scale reading will increase during the entire time the student is in contact with the scale.
The scale reading will decrease momentarily then will increase as the student is moving upward from the scale.
A force of 5 N is required to increase the speed of a box from a rate of 1.0 m/s² to 3.0 m/s² within 5 s along a level surface. What change would most likely require additional force to produce the same results?
reduce the mass of the box
increase the mass of the box
make the surfaces of the box smooth
make the surface of the oor smooth
Akbar and Lucia apply opposing forces on a wheeled cart that has a mass of 10 kg. The cart accelerates toward Akbar at a rate of 2 m/s². What is the amount of force applied by Lucia?
20 N
30 N
70 N
100 N
A hot air balloon exerts a force of 1200 N while lifting a load of 800 N. Which free-body force diagram depicts the forces involved?
A probe traveling through outer space is moving at a constant velocity. Which statement applies to the motion of this probe?
An unbalanced force is acting on the probe, causing it to accelerate.
The probe will undergo constant acceleration until a force acts on it.
The probe will continue on its current path until an unbalanced force acts on it.
The force that makes the probe move through space is equal to its mass divided by its velocity
Which statement best describes what must happen in order for a person to lift an object?
The force of gravity must be greater than the mass of the object.
The mass of the object must be greater than the force of gravity.
The force of gravity must be greater than the upward pull or push on the object
The upward pull or push on the object must be greater than the force of gravity.
The diagram represents forces acting on a block that accelerates 6.0 m/s² on a frictionless surface.
What is the mass of the block?
2.0 kg
4.0 kg
12 kg
72 kg
A 2000 kg car is pulling a 1000 kg trailer. The car's engine exerts a 6000 N force to move the car and the trailer. In addition, the car and the trailer each experience a 1000 N frictional force as they are being pulled, as represented below.
What is the magnitude of the net force on this system?
2000 N
4000 N
5000 N
8000 N
A ball has a mass of 0.1 kg and an initial velocity of 20 m/s. The ball is given an acceleration of 30 m/s2 for 5 s. What is the net force on the ball during acceleration?
0 N
3 N
10 N
15 N
The diagram below represents a block sliding across a table at a constant speed. All forces are shown except the frictional force.
What is the magnitude of the frictional force on the block?
