DE_Phys_Unit1

If you are riding in a bus with your friends, it looks like things are moving outside the bus when you look out the window while everyone inside the bus is stationary. To someone outside the bus, standing on the sidewalk, it looks like the bus and everyone inside the bus is moving. These are examples of different what?

If a ball is dropped off the roof of a house, how many dimensions of movement are there and along which axis(-es) does it move?

Along which axes will the arrow travel?

If you are traveling in a train in a straight line and at a constant speed (and you couldn't see outside and the train track was so smooth you couldn't tell you were even moving), you would not be able to even tell you were moving. This is an example of an inertial frame of reference. What would have to change to make this a non-inertial frame of reference?

The mass of your body is the same, whether you are standing on Earth or the Moon.

The weight of your body is the same, whether you are standing on Earth or the moon.

As a skydiver with a mass of 54 kg falls toward the Earth, she accelerates at 9.8 m/s². What is the force of gravity acting upon the skydiver? What must be true about the force of air resistance acting on the skydiver?

If a mass doubles but the force applied remains constant, the acceleration is halved...why? Remember F=ma can be rearranged to a=F/m

Draw a free body diagram for a car traveling to the left (draw all force vectors and label them)

A 40.0-kilogram boy is lying in an inner tube in a swimming pool when a larger boy with a mass of 80.0 kilograms floats by in his own inner tube. The first boy pushes the second with a force of 60.0 Newtons. Assuming that the mass of each inner tube can be ignored, what is the acceleration of each boy and his inner tube?

Why is speed considered a scalar quantity?

In the example of the billiard balls (pool table), the balls all move with the same speed. Why do they have different velocities?