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Questions and Answers
In a collision between a 50-ton bulldozer and a compact car, both vehicles experience the same force.
In a collision between a 50-ton bulldozer and a compact car, both vehicles experience the same force.
True (A)
Find the net force acting on a 2 kg object if the net acceleration is 10 m/s².
Find the net force acting on a 2 kg object if the net acceleration is 10 m/s².
20 N
What is the magnitude of the crate's resultant acceleration when two donkeys are pulling an 80 kg crate?
What is the magnitude of the crate's resultant acceleration when two donkeys are pulling an 80 kg crate?
7.3 m/s²
The reading on the scale for a 6-foot-tall man who weighs 170 lbs in a downward accelerating elevator is ______.
The reading on the scale for a 6-foot-tall man who weighs 170 lbs in a downward accelerating elevator is ______.
According to Newton's 2nd Law, ____ is the cause and _____ is the effect.
According to Newton's 2nd Law, ____ is the cause and _____ is the effect.
Find the force exerted on a 6 kg spare helmet by the dashboard when a stunt car hits a wall.
Find the force exerted on a 6 kg spare helmet by the dashboard when a stunt car hits a wall.
Determine the mass of an object given a 10 N force is applied to the North and a 5 N force is applied to the South with a constant acceleration of 2.0 m/s².
Determine the mass of an object given a 10 N force is applied to the North and a 5 N force is applied to the South with a constant acceleration of 2.0 m/s².
The weight of a crate is down and the normal force of the floor on the crate is up. The weight is _____ to the normal force and the two forces ___ an interaction pair.
The weight of a crate is down and the normal force of the floor on the crate is up. The weight is _____ to the normal force and the two forces ___ an interaction pair.
Find the force exerted on a 500 kg motorcycle that accelerates from rest to 25 m/s over a time interval of 5.5 s.
Find the force exerted on a 500 kg motorcycle that accelerates from rest to 25 m/s over a time interval of 5.5 s.
If a net force is acting on an object, then we can assume the object is being accelerated.
If a net force is acting on an object, then we can assume the object is being accelerated.
What is the speed of a 5 kg object at t = 4 s if it is propelled from rest by a net force F given by F = 0.5t?
What is the speed of a 5 kg object at t = 4 s if it is propelled from rest by a net force F given by F = 0.5t?
What is the magnitude of the net force on a particle moving with speed v = bt² + c at time t = t1?
What is the magnitude of the net force on a particle moving with speed v = bt² + c at time t = t1?
Which string must be the strongest to prevent breaking when three blocks connected by strings are pulled?
Which string must be the strongest to prevent breaking when three blocks connected by strings are pulled?
At which time is the force exerted by the elevator floor on a passenger the least during upward motion?
At which time is the force exerted by the elevator floor on a passenger the least during upward motion?
Find the normal force of leaves on a 0.6 kg squirrel coming to rest after falling.
Find the normal force of leaves on a 0.6 kg squirrel coming to rest after falling.
What is the magnitude of the friction acting on a refrigerator sliding with constant velocity when a 300 N force is applied?
What is the magnitude of the friction acting on a refrigerator sliding with constant velocity when a 300 N force is applied?
Determine the mass of an object given the net force acting on it is 15 N and the acceleration is 5 m/s².
Determine the mass of an object given the net force acting on it is 15 N and the acceleration is 5 m/s².
What is the reading on the scale for a 686 N person accelerating upward at 4.9 m/s²?
What is the reading on the scale for a 686 N person accelerating upward at 4.9 m/s²?
What is the tension in the cable pulling the 2500 kg elevator upward at a rate of 3.5 m/s²?
What is the tension in the cable pulling the 2500 kg elevator upward at a rate of 3.5 m/s²?
The property of matter which is a measure of an object's resistance to motion is called?
The property of matter which is a measure of an object's resistance to motion is called?
If a 5 kg object is being pushed with the same force as another object that has a mass of 12 kg, then what can we infer?
If a 5 kg object is being pushed with the same force as another object that has a mass of 12 kg, then what can we infer?
When an object is moving with constant velocity, we can assume the external forces acting on the object sum to zero.
When an object is moving with constant velocity, we can assume the external forces acting on the object sum to zero.
Which spring is stretched the most when three blocks connected to identical springs are pulled?
Which spring is stretched the most when three blocks connected to identical springs are pulled?
Which graph best represents the magnitude of the net force exerted on the object as a function of time?
Which graph best represents the magnitude of the net force exerted on the object as a function of time?
What is the tension in the string between blocks when a frictionless system is accelerated by an applied force F?
What is the tension in the string between blocks when a frictionless system is accelerated by an applied force F?
What is the acceleration of a block of mass 3 kg pulled along a frictionless, horizontal surface with force shown as a function of time?
What is the acceleration of a block of mass 3 kg pulled along a frictionless, horizontal surface with force shown as a function of time?
What is the speed of a block of mass 3 kg at t = 2 s when pulled along a frictionless, horizontal surface?
What is the speed of a block of mass 3 kg at t = 2 s when pulled along a frictionless, horizontal surface?
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Study Notes
Collision and Impact Forces
- In a collision, all vehicles experience the same impact force regardless of their masses.
Newton's Second Law Applications
- Net force can be calculated using F = ma; for a 2 kg object with an acceleration of 10 m/s², the net force is 20 N.
- An object with a net force of 15 N and an acceleration of 5 m/s² has a mass of 3 kg.
Forces and Acceleration
- If two donkeys apply forces in different directions on an 80 kg crate, the resultant acceleration is 7.3 m/s².
- A 500 kg motorcycle accelerating to 25 m/s in 5.5 seconds experiences a friction force of 2273 N.
Elevator Dynamics
- An elevator accelerating downward decreases the scale reading; for a 170 lbs man, the reading is less than 170 lbs.
- When a person weighing 686 N is in an upward-accelerating elevator at 4.9 m/s², the scale reads 1029 N.
Object Motion and Forces
- A normal force is equal to the weight of an object resting on a surface, but they are not an interaction pair.
- When an object moves with constant velocity, it indicates that external forces sum to zero.
Friction and Resistance
- A 300 N force applied to a 1500 N refrigerator results in a friction force of 300 N as it slides with constant velocity.
- Inertia quantifies an object's resistance to changes in motion.
Acceleration Relations
- If a 5 kg object and a 12 kg object are pushed with the same force, the 5 kg object accelerates 2.4 times faster.
Mass and Force Relationships
- The mass of the elevator and occupants is 2500 kg, with tension in the cable calculated to be 33,275 N when accelerated at 3.5 m/s².
- For an object propelled by a net force of F = 0.5t, the speed at t = 4 s is 0.8 m/s.
Spring and Tension Systems
- Among connected blocks with springs and subjected to forces, the spring connected to the 3m mass stretches the most.
- Tension in a system of blocks connected with strings can be calculated relative to the applied force.
Problem-Solving with Forces
- A block of mass 3 kg experiences different accelerations and speeds based on the applied force, illustrating how to derive speed and acceleration from applied forces over time.
Newton's First Law Insights
- An object not accelerating implies it is either stationary or moving at a constant speed; this underpins the essence of Newton's First Law.
Force Relationships in Collisions
- During a collision with a wall, the force exerted can be calculated based on mass and deceleration of an object (e.g., a helmet striking a dashboard generates a force of 1140 N over 0.07 seconds).
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