Equations
12. The equation for gravitational force is _________________________ .
F=mg
If you drop an object with a mass of 13 kg, what force does it fall with?
127.4 Newtons
24. If all other forces except gravity are small enough to be ignored, the object is said to be in ________________________________ .
free fall
There is a force of 90 Newtons working on a ball with a mass of 9 kg. How fast is the object accelerating?
10 m/s^2
28. How many laws of motion are there?
Three
23. What is the equation of momentum?
p=mv
If an object with mass of 2 kg is accelerating at a rate of 9m/s^2, what is the net force?
18 Newtons
35. ______________________ does not change unless the mass or velocity changes, but it can be transferred.
momentum
An object has a force of 49 Newtons and is accelerating at 7 m/s. What is the mass of the object?
7 kg
31. The net force of an object that is moving with a constant speed in a circular motion is in which direction?
Towards the center
34. What is the equation for weight?
W=mg
If an object with a mass of 15 kg is falling, what is its force according to Earth's gravity?
147 Newtons
38. The ____________________________ of an object is the product of its mass times velocity.
momentum
A twig fell from a tree with a mass of 8 kg. What is the force of the falling twig?
78.4 Newtons
36. If acceleration is towards the middle, the object is exerting a net force towards the center. This force is called ___________________________ .
centripetal force
41. What is the unit for momentum?
(kg)(m/s)
A remote hits the floor with a force of 98 Newtons. What is the mass of the remote?
10 kg
44. Anything that is thrown or shot through the air is called a ______________________________
projectile
What is the momentum of an object with a mass of 7kg and a speed of 6 m/s?
42 (kg)(m/s)
40. _______________________ is the tendency of an object to resist a change in motion.
Inertia
What is the equation for net force?
f=ma
A 4 kg child rollerblades at 8 m/s. What is her momentum?
32 (kg)(m/s)
29. Which of the following describes why astronauts seem weightless in orbit?
They are in free fall
What is the mass of an object with a speed of 12 m/s and a momentum of 144 (kg)(m/s)?
12 kg
42. Acceleration towards a curved or circular path is called
centripetal acceleration