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Newton's Laws of Motion
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The greater the mass of an object, the ____________ the force needed to move the object. (less, greater)
greater
When you are in the car and suddenly the driver hits the brakes and you move forward. This is an example of inertia. True or false?
True
Newton's 1st law of motion is also known as the law of inertia. True or false?
True
A piano is being pushed and is moving in the left direction. Is this a balanced or unbalanced force?
unbalanced force
A ball is motionless on the grass. Is this a balanced or unbalanced?
balanced force
Which law of motion explains the engine of a rocket pushing down (action) and the force of the rocket that moves it up (reaction)?
Newton's 3rd law of motion
What does the "a" in F = ma represent?
acceleration
What does the "m" in F = ma represent?
mass
Inertia is an object's resistance to change. True or False?
True
If the mass of an object decreases, the inertia of the object ______________. (increases, decreases, or stays the same)
decreases
What word describes 2 surfaces rubbing against each other causing an object in motion to slow down.
friction
What is the unit for force?
Newtons (N)
Which bucket has more inertia? The empty bucket or the bucket filled with sand?
The bucket filled with sand has more inertia because it has a greater mass. It will require a greater force to move it.
The elephant is free-falling. What force will be in the opposite direction of the force of gravity?
force of air resistance (Fair)
The image is showing an unbalanced force. How do we know it is an unbalanced force?
The amount of force applied in both directions is unequal. One force is greater than the other.
Is this a balanced or unbalanced force?
balanced
According to Newton's 1st law of motion, an object at rest stays at rest and an object in motion stays in ____________ unless an unbalanced force is applied.
motion
What is the net force of the free-body diagram?
18 N
According to Newton's 3rd law of motion, for every action there is an equal and opposite ____________.
reaction
While out playing in the yard, you set a rock on top of a fence. The next day, you see that the rock is still sitting where you left it. Which law of motion is this describing?
Newton's 1st Law of Motion
While moving, Matt found out that it was much easier to push a box filled with pillows than a box filled with books because the box filled with books had much more mass. Which law of motion is this describing?
Newton's 2nd Law of Motion
When a diver jumps off a diving board into a pool, she pushes down on the diving board. The diving board then pushes up against her, launching her into the air. Which law of motion is this describing?
Newton's 3rd Law of Motion
How much force is needed to get a roller coaster car with a mass of 1,300 kg moving to an acceleration of 15 m/s2?
19,500 N
A person standing on ice has a mass of 80 kg. His friend pushes him and is now accelerating at 8 m/s^2. What is the force of the push?
640 N