Show:
Skating
Falling Balls
Ramps
Wheels
Bumper Cars
100
Of the following devices, this can be used to cause the car to accelerate: the gas pedal, the brake pedal, the steering wheel, all of the above.
What is all of the above.
100
Suppose you go from the earth to a planet where the acceleration due to gravity is 2.5 m/s^2. On the new planet your weight will be about (relative to your weight on earth)...
What is 1/4 its value on Earth
100
Suppose you weigh 986N. This is the amount of force the Earth exerts on you.
What is 986N
100
A baseball player throws a bat up in the air, so that it spins as it translates. The bat will rotate about this.
What is its center of mass
100
Force and momentum are related in that:
What is force is a change in momentum per unit time
200
The SI unit of acceleration.
What is m/s^2
200
A projectile is thrown directly upward and caught again. At the top of its path: it stops accelerating; its vertical velocity is zero; its horizontal velocity changes; its acceleration changes.
What is its vertical velocity is zero
200
You must do this in order to do a positive amount of work.
What is exert a force and move in the direction of the force.
200
It is possible for two objects of equal mass to have different rotational masses because:
Rotational mass depends on total mass and mass distribution
200
Suppose you are driving your car down the highway and speeding up. What is happening to the car's kinetic energy and to the car's momentum?
Both the car's kinetic energy and momentum are changing.
300
If you are backing up but slowing down, your acceleration is directed in this direction.
What is forwards.
300
If you have a mass of 80kg and are on a planet where the acceleration of gravity is 5m/s^2, your weight on the planet is:
What is 400N
300
A 40kg box that is 6m above the ground has this much potential energy
What is 2400J
300
This type of friction causes (ball) bearings to not waste much energy.
What is static friction
300
For momentum to be conserved in a system, it must experience this:
What is no net external force.
400
A net force of 8N is applied to a 2kg object. The object's acceleration is...
What is 4 m/s^2
400
This is the maximum height above the ground for a gymnast jumping straight upward with an initial speed of 10m/s.
What is 5m.
400
You push on a box with a horizontal force of 20N and the box moves a distance of 8m. This is the amount of work you have done on the box.
What is 160J
400
Consider the earth spinning from west to east on its axis. It is slowing down in its rotation due to friction with the air. Using the right hand rule, this is the direction of the frictional torque.
What is N pole to S pole
400
This is the equation for the impulse-momentum theorem
What is Impulse delivered by net force = change in momentum
500
The neighborhood joker comes up to you and is really on a roll this morning. After several "good ones" he then says "OK, so you're taking physics, right? Here's one - if the acceleration of gravity is 9.8 m/s^2 then why isn't everything accelerating? Hahahaha. Being a dedicated student you give this question some real thought and come up with a reasonable response. You might say...
Gravity is just part of the story and it is the total net external force that determines acceleration.
500
Suppose you throw a ball upwards with a certain initial speed from a certain height h above the ground, and you wait for it to go up, stop, and come back down to the same (initial) position. Including air resistance, how will its speed hitting the ground on the way back down compare to its launch speed?
It will be less than its launch speed (air resistance acts both ways)
500
These are two situations where no work is done by a force.
What is 1) there is no distance the force acts through and 2) the force and motion are perpendicular
500
Of the following, friction does NOT depend upon: the types of surfaces in contact, the area of contact, the force with which an object is pressing against a surface, whether the contact surface is wet or dry.
What is the area of contact
500
An 800 kg car moving at 4 m/s to the right strikes a 400kg car moving to the left. If the cars stick together and stop moving right after the collision, this was the velocity of the 400kg car (before the collision).
What is 8 m/s