click below
click below
Normal Size Small Size show me how
Newton's 1st law
motion
Question | Answer |
---|---|
State Newton's first law | Object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an outside force |
What is another name for Newton's first law | The law of inertia |
What is inertia? | ability of objects to resist change |
What term is used to describe the amount of matter in an object? | mass |
What is the difference between mass and weight? | Mass is the amount of matter in an object while inertia depends upon gravity |
What does inertia depend upon? | the amount of mass |
Does a 2 kg iron brick have twice as much inertia as a 1 kg iron brick? Twice as much mass? | Yes |
The law of inertia states that no force is required to maintain motion. Why, then, do you have to keep peddling your bicycle to maintain motion? | to overcome friction which will eventually bring you to a stop |
Forces of 10 N and 15 N in the same direction act on an object. What is the net force on the object? | 25 N |
If forces of 10 N and 15 N act in opposite directions on an object, what is the net force? | 5 N |
If a woman has a mass of 50 kg, what is her weight in newtons? | 490 N |
A medium-size American car has a weight of about 3000 pounds. What is its mass in kilograms? | 1364 kg |
If an elephant were chasing you, its enormous mass would be very threatening. But if you zigzagged, the elephant's mass would be to your advantage. Why? | Its huge mass would make it difficult to change direction |
When you compress a sponge, which quantity changes: mass, inertia, volume, or weight? | volume |
what is the equation for Newton's first law | Weight = m (in kg) times g (9.8 N/kg) |