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Explain what happens when multiple forces act simultaneously on a single object.
The net effect determines motion
Calculate the gravitational force on an object with mass 8 kg
78.4 N
Which friction can act even when an object is not moving.
Static friction ; direction opposite to applied force
A mass hangs from a rope and remains at rest. Describe all forces acting on the mass.
Forces: weight downward, tension upward
A place or object used for comparison to determine if something in motion
Reference point
A 50 N force pushes a box to the right, while friction opposes it with 35 N.
(a) Calculate the net force.
(b) Determine the direction of motion.
15 N right
If an object has a mass of 8 kg and is in equilibrium, calculate its acceleration
no acceleration
A 12 kg object hangs motionless from a rope.
(a) Calculate the gravitational force.
(b) Determine the tension in the rope.
gravitational force= 117.6 N = tension
A 6 kg object is on Earth (g = 9.8 m/s²).
(a) Calculate its weight.
(b) Predict its weight on a planet where g = 3.7 m/s².
w1 = 58.8 N
w2 = 22.2 N
An object has a weight of 98 N on Earth.
Calculate its mass.
10 kg
A box sits on a table while being pushed but not moving. Identify all forces and explain why it remains at rest.
Forces: weight downward, normal upward, applied push forward, friction backward;
object stays at rest because net force = 0
An object experiences three forces: 20 N right, 12 N left, and 5 N right. Calculate the net force acting on the object and determine the acceleration if the mass is 3 kg
13 N right, 4.33 m/s2
Explain why Newton’s First Law is called the Law of Inertia
Inertia is the property of an object that makes it: Stay at rest if it is at rest and continue moving if it is already in motion unless acted on by an external force.
NFL: An object at rest stays at rest, and an object in motion continues in motion at constant velocity unless acted upon by an unbalanced force.
If an object has a mass of 5 kg and moves with constant velocity, calculate its acceleration and net force.
0 , 0
A box is being pushed 20 N to the right by Alpha. At the same time Beta pulls the box to the right with Force of 10 N. At the same time Gamma pulls the box to the left with a force of 30 N. What is the resultant force of that box?
0
A 96 N box slides across the table. When 65 N force is applied horizontally and to the right on box, box moves to the right at constant velocity. What is value of the coefficient of friction between table and box?
0.677
A 96 N box slides across the table. When 65 N force is applied horizontally and to the right on box, box moves to the right at at constant velocity. How much Kinetic friction force acts on the box?
65 N to left
A 50 kg parachutist is falling through the air. 350 N of drag force act upward on him. How much net force acts on him?
140 N down
137.2 N , 137.2 N
A 50 kg parachutist is falling through the air. 350 N of drag force act upward on him. what is the acceleration?
2.8 m/s2 down
A 10 kg box experiences a frictional force of 25 N while sliding horizontally across a level surface.
(a) Calculate the normal force.
(b) Determine the coefficient of friction.
98 N
.255
Two objects experience a gravitational force of 10 N.
(a) If one mass is doubled, what is the new force?
(b) If instead the distance is doubled, what happens to the force?
20 N
2.5 N
Two objects with masses 50 kg and 100 kg are separated by a distance of 2 m.
Calculate the gravitational force between the two objects. If the distance is doubled, determine the new gravitational force between them.
8.34×10−8 N
2.09×10−8 N
A 10 kg wooden box is pushed along a floor with a force of 40 N. If the frictional force opposing the motion is 12 N, what is the acceleration of the box?
2.8 m/s2
Dave and Alex push on opposite ends of a car that has mass of 875 kg. Dave pushes car to the right with a force 250 N and Alex pushes to the left with force 315 N. What is net force on car in x- axis and acceleration of the car?
65 N to left, .074 m/s2