The Basics
What is the name, not the definition, of Newton's 1st Law?
inertia
A car is easier to push than a bus. This is an example of which number of Newton's Laws?
2nd
What is the formula for Newton's 2nd Law?
force = mass* acceleration
F=ma
What is the first name of the man who is credited with defining the Laws of Motion?
Isaac
If there is motion, all laws of motion can be applied.
True
Which number of Newton's Laws is known as the Law of Conservation of Momentum?
3rd Law
A swimmer pushes her arms backwards and she is propelled forward. This is an example of which number of Newton's Laws?
3rd
Calculate the amount of force exerted when a giant Pacific Octopus with a mass of 50 kg swims at a speed of 10 m/s.
500N
You can only apply a force on an object if that object applies an opposite force on you. True or False
True. Think of it like this: You can only touch something if it touches you!
Gravity pulls a skydiver down as the air resistance pushes the skydiver up. This is an example of Newton's 3rd Law.
False because both forces are acting on the skydiver. In other words, the friction from the air is "slowing" down the skydiver not pushing the skydiver up.
An object at rest stays at rest, and an object in motion stays in motion in a straight line until an outside force causes a change. Which number of Newton's Laws does this define?
1st
Air is released from a balloon-powered car. The air in the balloon is expelled backwards, and the car is pushed forward. Which number of Newton's Laws is this an example?
3rd
A llama weighing 200 kg needs to be transported on a stretcher. The upward acceleration on the stretcher is 0.63 m/s. What net force is needed to accelerate the llama?
126 N
(200 kg)(0.63 m/s/s) = 126 N
According to Newton's 2nd Law:
If the force is held constant and the mass increases, the acceleration will _________.
increases, decreases, remains the same
decreases
Only solid matter has inertia since inertia is based on mass.
False
Which number of Newton's Laws is defined as such?
When one object exerts a force on another object, the second object exerts a force on the first that is equal in strength and opposite in direction.
3rd Law
A skateboarder hits a rock and is then thrown over her skateboard onto the ground. Which number of Newton's Law is this an example?
1st
What is the acceleration of a 650 kg racing camel that has a forward net force of 897N?
1.38 m/s/s
897/650
Friction, a resisting force, is an example of an outside force that can affect the motion of an object. What type of friction must be overcome to cause an object to move from its original position?
static
Newton's 3rd Law supports the reason why objects tend to move in a straight line.
False. It's Newton's 1st Law
What is name, not the number, of Newton's Laws defined as the following?
________ The acceleration of an object is in the same direction as the net force on the object.
momentum
A bug hits a windshield. The force of the bug on the windshield is _____ the force of the windshield on the bug.
greater than , less than, or equal to
equal to....Although the forces are equal, the bug gets squished because it has less mass and a soft body.
A cheetah accelerates at 5.4 m/s/s with a force of 388.8 N. What is the cheetah's mass?
72 kg
388.8/5.4
A 400 g ball rests on a flat table. What is the force exerted on the ball by the table?
Hint: Newton's 2nd Law
400N
If an unbalanced force acts on an object, the objects velocity does not change.
False. Unbalanced forces cause a change in motion.