Science Chapter 2

1.

1 point

An object that is accelerating may be...

slowing down

gaining speed

gaining direction

all of the above

2.

1 point

An object with increasing speed undergoes what kind of acceleration?

3.

1 point

A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train's acceleration be described?

Positive

Will come to rest in 6 minutes

Not accelerating

Negative

4.

1 point

As you push an object across a surface, the sliding friction acting on the object

acts in the direction of motion

equals the weight of the object

acts in the direction opposite of motion

is usually greater than static friction

5.

1 point

What is the speed of a bobsled whose distance-time graph indicates that it traveled 100 m in 25 s?

2500 m/s

0.25 mph

0.25 m/s

4 m/s

6.

1 point

If a net force of zero is produced, the forces are

7.

1 point

The sum of all forces acting upon an object is called

8.

1 point

An arrow represents the size and _____ of a force.

9.

1 point

Which of the following describes constant acceleration exclusively due to a change in direction?

An object in free fall

An object at rest

Increasing speed on a turn

Traveling around a circular track

10.

1 point

The drag force acting on a falling object is also called

11.

1 point

An object moving at 30 m/s takes 5 s to come to a stop. What is the object's acceleration?

6 m/s^2

-30 m/s^2

30 m/s^2

-6 m/s^2

12.

1 point

The force opposing the motion of objects in contact with each other is called

13.

1 point

The property of matter which resists changes in motion is...

friction

inertia

weight

gravity

14.

1 point

A speedometer measures what?

15.

1 point

The forces acting on a falling leaf are...

air resistance and fluid friction

gravity and air resistance

gravity and static friction

weight and rolling friction

16.

1 point

An orange may fall off of your plate when you suddenly stop because of...

the orange's inertia

the centripetal force acting on the orange

the friction forces acting on the orange

the balances forces anting on the orange

17.

1 point

The tendency of an object to resist any change in its motion is

18.

1 point

The difference between speed and velocity is what?

19.

1 point

If you increase your walking speed from 1 m/s to 3 m/s in a period of 1 s, what is your acceleration?

4 m/s^2

2 m/s^2

5 m/s^2

3 m/s^2

20.

1 point

Instantaneous speed is measured when/where?

At the starting point

Over the trip's duration

At any point during travel

At the destination

21.

1 point

The acceleration due to gravity on the surface of Mars is about one-third of that on Earth's surface. The weight of on object on Mars is about

the same as it's weight on Earth's surface

one-third of it's weight on Earth's surface

nine times it's weight on Earth's surface

triple it's weight on Earth's surface

22.

1 point

As an astronaut travels farther from Earth, his/her weight

decreases because gravity decreases

remains the same because his/her mass remains the same

decreases because his/her mass decreases

increases because his/her speed increases

23.

1 point

The two forces acting on a falling object are both

Magnetism

Gravity

Air Resistance

Fluid Friction

24.

1 point

Freely falling objects accelerate at 9.8 m/s^2 because of what force?

25.

1 point

When a pair of balanced forces acts on an object, the net force that results is…

Greater in size than one of the forces

Greater in size than both forces combined

Equal to zero

Equal in size to one of the forces

26.

1 point

A push or pull is a