1D Motion
A car accelerates from rest at a rate of 2 m/s^2 for a distance of 100 meters. How much time does it take for the car to reach the end of the distance
A 5000kg truck and a 1000kg car are travelling at constant speeds and then collides. What is true about the Forces and acceleration on each?
5000kg truck exerts a greater force on the 1000kg car, but the acceleration will be same.
A stunt person jumps from the roof of a tall building, but no injury occurs because the person lands on a large, air-filled bag. Which one of the following BEST describes why no injury occurs?
The bag provides an impulse equal to the person's change in momentum by increasing the time of impact.
What is the kinetic energy of a 60 kg man running at 8 m/s?
1920J
The velocity is 8.66 m/s and the vertical component is 5 m/s
If an object has a constant velocity, what can be said about its acceleration?
The acceleration is zero
A man is whirling a 0.5 kg ball on a 1.0 m long string at 2 m/s. What is true about the force on the ball?
It pulls in, toward the center of the circle
A layer of padding is added to car dashboards because it can reduce some injuries during a collision. How does the padded dashboard make people safer?
It increases the time of impact during the collision
A bird carries a 0.2 kg apple at a height of 20 m above the ground as it flies at a velocity of 5 m/s. What is the total energy of the apple-Earth system?
39.7J
Can you name a example of vector quantity in you life?
Something with speed and direction Push/Pull is a direction displacement
What is the average acceleration of an object that changes its velocity from 10 m/s to 30 m/s in 5 seconds?
4 m/s^2
If the car of 75kg is traveling around a curve of radius of 50m at a velocity of 15 m/s, what is the centripetal force of the car?
337N
An object has a mass of 100 kg moving at 5 m/s. What is the linear momentum of the object?
500 kg m/s
A pendulum with a mass of 0.8 kg is released 1.6 m above the ground. What is the velocity of the pendulum when it hits the ground?
6.26m/s
Can a Vector be negative?
The sign of the component determines the direction of the vector
A car accelerates from rest at a constant rate of 2 m/s^2 for a distance of 100 meters. What is the final velocity of the car?
A box is pushed with a force of 50 N across a frictionless surface. If the mass of the box is 10 kg, what is the acceleration of the box?
5 m/s².
A car with a mass of 1000 kg is traveling east with a velocity of 20 m/s, while another car with a mass of 1500 kg is traveling west with a velocity of 15 m/s. What is the total momentum of the system?
-2,500 kg·m/s to the west.
A machine exerts a constant force of 200 N to move an object horizontally for a distance of 10 N meters. If the object is moved in 5 seconds. Calculate the work done by the machine and the power exerted
2000J of work and exerted 400 watts of power
A car travels 80 kilometers east and then 60 kilometers north. What is the magnitude and direction of its resulting displacement?
The magnitude of the resulting displacement is 100 kilometers, and the direction is approximately 36.87 degrees north of east.
A ball is thrown vertically upward with an initial velocity of 20 m/s. If the acceleration due to gravity is 9.8 m/s^2 how high does the ball rise before it starts falling back down?
20.41 meters
A 2 kg object is subjected to a net force of 10 N. What is the acceleration of the object?
5 m/s².
A tennis ball with a mass of 0.05 kg is initially at rest. If a racket exerts an average force of 50 N on the ball for a duration of 0.02 seconds, what is the final velocity of the ball?
20 m/s.
A crane lifts a load vertically upwards with a force of 5000 N. If the load is lifted to a height of 20 meters in 10 seconds, calculate the work done by the crane and the power exerted.
The crane has done 100,000 joules of work and exerted 10,000 watts of power.
A hiker walks 4 kilometers due north and then 3 kilometers due west. What is the magnitude and direction of the hiker's resulting displacement?
The magnitude of the resulting displacement is 5 kilometers, and the direction is approximately 53.13 degrees west of north.