Concepts in Physics

A rock is tossed up with some speed v. One second later, another rock is tossed down with speed twice as large as v. If you neglect air resistance, the acceleration experienced by the first rock 2 seconds after it was tossed up will be __________ the acceleration of the second rock. (Hint: remember the definition of g)

• Greater than

• Smaller than

• Same as

Tags

NGSS.MS-PS2-4

If an object is known to have no acceleration, we can state that it is:

• a. At rest

• b. Has constant non-zero velocity

• c. Either a or b is true

• d. None of the above

A satellite moving with a constant speed around the Earth is accelerating

• True, its speed is constant

• True, it is changing direction

• False, its speed is constant

• False, there is no unbalanced force acting on it

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

A car is going through a turn with a certain speed and sadius. It then keeps the speed and takes the turn with a wider radius. We can say that its new centripetal acceleration (as compared to before it slowed down) is:

• Smaller because the radius of the turn is greater

• The same because its speed stayed the same

• Greater because the radius of the turn is greater

You are moving in a positive direction and slowing down. Your velocity and acceleration are:`

• Velocity is positive, acceleration is positive

• Velocity is positive, acceleration is negative

• Velocity is negative, acceleration is positive

• Velocity is negative, acceleration is negative

• Velocity is positive, acceleration is zero

On Jupiter your weight will be ___________ than on Earth

• higher

• lower

• the same

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

A brick weighs about 10N and is accelerated to a speed of 5 m/s. To keep lifting it at that constant speed you need to apply a vertical force that is:

• Greater than 10N

• Equal to 10N

• Less than 10N

Tags

NGSS.MS-PS2-4

A Nerf dart hits your little brother (fired by your other little brother, of course). The force on your brother is

• Less than the force on the dart

• More than the force on the dart

• The same as the dart

Tags

NGSS.MS-PS2-1

Why is your weight not four times as much when you go into a deep basement?

• Because the Sun, stars, and everything with mass pull on you also

• Your weight doubles, not quadruples

• Because you're not twice as close to the Earth's center

Two objects are separated by distance d. If the distance is tripled, the force of gravity between these objects __________ of the original force.

• 9 times

• one third

• one ninth

• 3 times

Tags

NGSS.HS-PS2-4