Wednesday, 4 March 2015

NEWTON;S LAWS PROBLEMS

1.            How much net force is needed to accelerate a 15kg mass at 2.8 m/s2?

2.            Delon’s car is dead. He is pushing it to the east out of the parking lot with a force of 250N. carter, being a good friend, comes to help and also pushes east with a force of 75N. If Delon’s car has a mass of 750kg, what is the car’s acceleration?

3.            Hunter is pulling on his little red wagon to the west with a force of 125N. Luke doesn’t want him to take the wagon so he is pulling in the opposite direction with a force of 75N. If the wagon has a mass of 15kg, what is the wagon’s acceleration?

4.            A planes engine is pushing it north with a force of 1250N. The wind is blowing to the east with a force of 125N. If the plane is a 775kg mass, what is the magnitude of its acceleration?

5.            A 50.0kg box is being pulled by two teams of people. Team Bonzo is pulling on the box with a force of 324N @ 40.0˚ N of E. Team Kong is pulling on the box with a force of 856N @ 20.0˚ W of N. What is the resultant acceleration of the box? (There are NINE calculations needed to get to the proper answer!)

MOTION ACCELERATION

1.     1.  A car with a velocity of +22m/s is accelerated at a rate of +1.6m/s2 for 6.8 s. What is the final velocity of the car?

2.   2.    What is the final velocity of a proton that starts at +2.35x105m/s, and is accelerated at the rate of -1.10x1012m/s2 for a period of 1.50x10-7s?

3.   3.    How far does a plane fly in 15.0s if its velocity changes from +145m/s to +70m/s at a constant acceleration?

4. 4.      An astronaut on the moon drops a feather from a height of 1.20m above the surface. If the acceleration due to gravity on the moon is 1.62m/s2, how long does it take the feather to reach the surface of the moon?

5.   5.    Engineers are developing new types of guns that might someday be used to launch satellites as if they were bullets. One such gun can give a small object a velocity of 3.5km/s moving it through a distance of only 2.0cm. What is the acceleration of this gun in m/s2?

6.     6.  A car traveling at 70.0m/s stops in a distance of 50.0m. What is its acceleration?

MOTION WORKSHEET

1. For everyday situations, to what is motion assumed to be relative to?

1. A car travels at a constant speed of 20m/s and yet it does not have a constant velocity. Explain how this could be.

1. How long will it take a car traveling at a constant speed of 45m/s to cover a distance of 2.5km?

1. How far will a swimmer travel in 3.0min if her speed is 2.5km/hr?

1. The starter of a race stands at one end of a line of runners. What is the difference between the arrival of the sound of his pistol at the nearest runner and the most distant runner who is 10.0m farther away? (The speed of sound in air is 343m/s.)

1. How long will it take light from the Sun to reach the Earth? The distance from Earth to Sun is 1.50x108km, while the speed of light is 3.00x108m/s.

1. How many minutes does it take light to get from the Sun to the Earth?

1. A car travels 540km in 4.5hr.
A)    How far will it go in 8.0hr at the same average speed?

B)    How long will it take the car to travel 210km at this average speed?