Wednesday
September 17, 2014

Homework Help: Newton's Laws

Posted by Cole on Monday, April 8, 2013 at 7:21pm.

1. An 1760 kg car is moving to the right at a constant velocity of 2.94 m/s.
(a) What is the net force on the car?
(b) What would be the net force on the car if it were moving to the left?

2.A freight train has a mass of 6 107 kg. If the locomotive can exert a constant pull of 15 105 N, how long would it take to increase the speed of the train from rest to 85 km/h?

3. Pick the statements below that describe Newton's Second Law. You must pick all the correct answers to get credit.
-If mass increases and force stays the same, acceleration decreases
-Law of inertia
-An object in motion needs a force to keep it moving
-If force increases and mass stays the same, acceleration increases
-For every action, there is an equal but opposite reaction
-An object in motion remains in motion unless acted on by an outside force
-Net force equals zero in equilibrium
-Sum of all forces equals zero in equilibrium
-For every action, there is a reaction in the same direction
-An object at rest remains at rest unless acted on by an outside force
-Fnet=m*a

4.Pick the situations below that fit Newton's Second Law. You must pick all the correct answers to get credit.
-A crate is pushed forward with 60N while friction acts backward with 60N of force
-An airplane is in equilibrium
-The net force on a helicopter is 3,000N
-The forces on a skateboarder are balanced
-A dog pushes down on the ground with 16N of force and the ground pushes up on the dog with 16N of force
-A car accelerates forward at 1.6m/s²
-The forces on an arrow are unbalanced
-A bicycle pushes down on the ground with 67N of force and the ground pushed down on the bicycle with 67N of force.
-A box is pushed forward with 900N and friction acts backwards with 400N of force
-A truck drives at a constant speed of 100m/s


5.Pick the statements below that describe Newton's First Law. You must pick all the correct answers to get credit.
-An object at rest remains at rest unless acted on by an outside force
-If mass increases and force stays the same, acceleration decreases
-Law of inertia
-An object in motion remains in motion unless acted on by an outside force
-For every action, there is an equal but opposite reaction
-For every action, there is a reaction in the same direction
-Sum of all forces equals zero in equilibrium
-An object in motion needs a force to keep it moving
-If force increases and mass stays the same, acceleration increases
-Net force equals zero in equilibrium
-Fnet=m*a

6.Pick the situations below that fit Newton's First Law. You must pick all the correct answers to get credit.
-A crate is pushed forward with 90N while friction acts backward with 90N of force
-The net force on a helicopter is 5,000N
-A box is pushed forward with 700N and friction acts backwards with 400N of force
-A dog pushes down on the ground with 31N of force and the ground pushes up on -the dog with 31N of force
-A car accelerates forward at 3.7m/s²
-The forces on a skateboarder are balanced
-A bicycle pushes down on the ground with 66N of force and the ground pushed down on the bicycle with 66N of force.
-A truck drives at a constant speed of 10m/s
-An airplane is in equilibrium
-The forces on an arrow are unbalanced

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