Question 1

What is the acceleration of an object whose velocity is not changing?

Group of answer choices

zero.

It depends on the net force on the object and the object's mass.

9.8 m/s²

Question 2

Which of the following do the acceleration and velocity of the same object have in common?

Group of answer choices

They are both always in the same direction.

They have the same units.

They are both vectors.

If one is zero, then the other is always zero, as well.

Question 3

Which of the following is a possible scientific hypothesis?

Group of answer choices

Gold is the most beautiful material in the world.

Albert Einstein was the smartest person in the world.

1 kg of gold is heavier than 2 kg of water on the earth.

Question 4

Which of the following is a unit of measurement?

Group of answer choices

area

centimeter

time

length

Question 5

Which of the following is a dimension of measurement?

Group of answer choices

energy

seconds

kilograms

meters

Question 6

A massive object will always move in a straight path with a constant speed unless ...

Group of answer choices

the net force on the object is zero.

the net force on the object is not zero.

there are forces acting on it.

Question 7

Consider an object that has only two different forces acting on it:

• 10 N up
• 20 N down

What direction is the acceleration of this object?

Group of answer choices

There is no acceleration because the motion of the object is not given.

The answer depends on whether there is also a support force holding it up.

Down

Up

Question 8

In our class I've made it a point that when we say, "What is the motion?", we really mean, "What is the the ...."?

Group of answer choices

acceleration

trajectory

velocity

vector

Question 9

Which of the following are units of impulse?

Group of answer choices

kg * m/s

Joules

kg * m/s²

N * m

Question 10

An object here at the surface of earth has a mass of 25 kg.

Which of the following is true?

Group of answer choices

The object will have the same mass on the moon.

The object will have a lighter mass on the moon.

The object will have a heavier mass on the moon.

Question 11

Which object has more momentum?

Object A has a speed of 2 m/s and a mass of 3 kg

Object B has a speed of 3 m/s and a mass of 2 kg

Group of answer choices

Object A

Object B

Both objects have the same momentum.

Question 121pts

Which object has more kinetic energy?

Object A has a speed of 2 m/s and a mass of 3 kg

Object B has a speed of 3 m/s and a mass of 2 kg

Group of answer choices

Object B

Object A

Both objects have the same kinetic energy.

Question 13

A force of 20 N acts for 3 seconds on a ball.

How much time should a 30 N force act to provide the same impulse?

Group of answer choices

10 s

17 s

3 s

2 s