____ is rate of change of position.
Speed
Velocity
Acceleration
Displacement
2. Which of the following is the difference between speed and velocity?
direction
units
speed
none of the above
3. A planet is discovered that is the same size as Earth and has the same gravitational acceleration, but it has twice the mass. If you weigh 700 N on Earth, on the new planet you would weigh ____.
350 N
700 N
1,400 N
2,800 N
My answers are
b
d
c
#1 and 3 are ok, but the difference between speed and velocity is direction.
The magnitude of the velocity is the speed, but the velocity is a vector quantity, which is a directed speed.
1. The rate of change of position is called velocity. Velocity is a vector quantity, meaning it has both magnitude and direction. It can be calculated by dividing the change in position by the change in time.
To calculate velocity:
1. Measure the initial position (x1) and final position (x2).
2. Measure the initial time (t1) and final time (t2).
3. Calculate the change in position: displacement = x2 - x1.
4. Calculate the change in time: Δt = t2 - t1.
5. Calculate velocity using the formula: velocity = displacement / Δt.
2. The difference between speed and velocity is the concept of direction. Speed is a scalar quantity, meaning it only has magnitude (how fast an object is moving) but no direction. On the other hand, velocity is a vector quantity as it includes both magnitude (speed) and direction.
For example, if a car is moving at a constant speed of 60 mph eastwards, its speed is 60 mph, and its velocity is 60 mph eastwards.
3. The weight of an object is the force with which it is pulled towards the center of the Earth due to gravity. The weight of an object can be calculated by multiplying its mass by the acceleration due to gravity.
So, if you weigh 700 N on Earth, and the gravitational acceleration is the same on the new planet, the weight on the new planet can be calculated by considering the change in mass. In this case, the new planet has twice the mass of Earth.
To calculate weight on the new planet:
1. Multiply your weight on Earth (700 N) by the ratio of the mass of the new planet to the mass of Earth (2:1).
2. The weight on the new planet would be 700 N * (2/1) = 1,400 N.
Therefore, if the conditions remain the same, you would weigh 1,400 N on the new planet.