Newton's First Law
The more mass an object has, the ______ inertia it has.
more
What is the equation for Newton's 2nd Law?
F=ma (must be capitalized correctly)
True or False: Newton's 3rd law states that objects have opposite and unequal reactions
False
What does the equation F=ma stand for?
A cart is being pushed with a force of 50N, friction is opposing the push with a force of 100N. What is the total net force acting on the cart?
50N
What type of forces cause a change in motion, or acceleration.
unbalanced
If the net force on an object is doubled while its mass remains the same, what happens to its acceleration?
Acceleration would increase.
Which example(s) demonstrates Newton's 3rd Law?
1. A rocket ship taking off
2. An apple falling from a tree
3. A person kicking a ball
4. Blowing up a balloon then releasing it
1 and 4
What is the unit is measure for:
1. Force
2. Mass
3. Acceleration
1. Newtons (N)
2. kilograms (kg)
3. meters per second squared (m/s2)
A brother is pulling a toy from his sister with a force of 64 N. The sister is pulling back with a force of 89 N.
Who gets the toy?
What is the net force?
Sister gets the toy
25N
What is the definition for Newton's 1st Law?
A body a rest will remain at rest, while a body in motion will remain in uniform motion, unless acted upon by an unbalanced force.
A box has a mass of 200kg and is accelerating at a rate of 3m/s2. What is the net force?
600N (must have correct answer and units)
What is the definition for Newton's 3rd Law?
For every action, there is an equal and opposite reaction.
How much force is needed to accelerate a 66 kg skier at 2m/s ?
132N (must have correct answer and units)
You and your brother are pushing a car with a dead battery with forces of 20 N and 25 N in the same direction. What is the net force applied on the car?
45N
What is inertia?
an object's resistance to any change in its state of motion
A force of 80 N acts upon a 100 kg block. Calculate the acceleration of the object.
A person is standing still on a smooth skateboard and throws a heavy medicine ball straight forward. Which of the following best describes the force experienced by the person?
A. The person experiences no horizontal force because they are just letting go of the ball.
B. The person experiences a forward force equal in magnitude to the force they exert on the ball.
C. The person experiences a backward force equal in magnitude to the force they exert on the ball.
C. The person experiences a backward force equal in magnitude to the force they exert on the ball.
If a 60 kg person on a 15 kg sled is pushed with a force of 300 N, what will be the person's acceleration?
4 m/s2
A 10 kg crate is pulled to the right with a force of 120 N, while a frictional force of 40 N pushes to the left. What is the net force and direction?
80N to the right
List two contact forces and two non-contact forces.
Contact: Non-contact:
-friction. -gravity
-applied -magnetism
-normal -electrostatic force
-air resistance
-tension
Mass is _____________ proportional to acceleration and force is _______________ proportional to acceleration.
indirectly ; directly
True or False: Action and reaction forces completely cancel each other out, resulting in a net force of zero.
False
(They act on different objects, so they do not cancel out)
A 5 kg block is pulled across a table by a horizontal force of 40 N with a frictional force of 8 N opposing the motion. Calculate the acceleration of the object.
6.4 m/s2
4 people are playing a tug of war. Two are pulling on the right side. Two are pulling on the left side.
On the right side, one is pulling with a force of 60 N and the other with a force of 70 N. On the left side, one is pulling with a force of 30 N.
How much force should the second person on the left apply to keep the rope in equilibrium?
100N