Physical Science Exercise 2

Force is a vector quantity because it has:

magnitude and direction

An object maintains its state of motion because it has:

mass

A tow truck exerts a force of 3000N on a car, accelerating it at 2m/s2. What is the mass of the car?

1500kg

The average speed of a horse that gallops a distance of 10km in a time of 30 minutes is:

20km/hr

If a car moved at an average speed of 80km/hr; how far would it travel in 3 hours.

240 km

A measure of how fast something is moving is called:

Speed

The force that supports an object against gravity, often called the normal force, is also known as:

Support force

The speed at which the acceleration of a falling object terminates when air resistance balances its weight is called:

Terminal velocity

Which one has zero acceleration? An object:

all of the above

The property of things to resist changes in state of motion is called:

inertia

Whenever the net force on an object is zero, its acceleration:

is zero

The speed of an athlete who covers a distance of 80 meters in 10 seconds is:

8m/s

If an object's mass is increased, while a constant force is applied to the object, its acceleration:

decreases

compared with the same mass of a certain object on Earth, the mass of the same object on the Moon is:

the same

The force required to maintain an object at constant velocity in free space is equal to:

zero

When a falling object reaches its terminal velocity, its acceleration is:

zero

What is the acceleration of a car that maintains a constant velocity of 100km/hr for 10 seconds?

0

A 10N falling object encounters 10N air resistance. The net force on the object is:

0N

A 1kg mass at the Earth's surface weighs about:

10N

Starting from rest, the distance a freely falling object (g=10m/s2) and (d=1/2gt2), will fall in 10 seconds is:

500m

The resistive force of friction occurs for:

All of these

The amount of friction that occurs when two material surfaces slide against each other depends on:

Both of these

Density is the amount of matter in a substance

False

The resistive force that opposes motion or attempted motion of an object is called:

Friction

One object that has twice as much mass as another object also has as much:

Gravitational acceleration

A kilogram is a measure of an object's:

Mass

Neglecting friction, a large block of ice and a small block of ice start sliding down an incline together. The heavier block will get to the bottom:

The same as the light block

A car traveling at 100km/hr strikes an unfortunate bug and splatters it. The force of impact is:

The same for both

Every object possesses inertia.

True

The ratio of gravitational force (F)to mass (m) is the same for all objects in the same locality.

True

Without net force there no acceleration

True

weight is a gravitational force exerted on an object

True

The property which specifies the speed and direction of motion an object is called:

Velocity

As an object freely falls, its:

Velocity increases

Space occupied by a given mass is called:

Volume

The force due to gravity is called:

Weight

Disregarding air resistance, objects fall at constant:

acceleration

If the mass of an object does not change, a constant net force on the object produces a constant:

acceleration

When you stand at rest on a pair of bathroom scales, the reading on the scales will always:

add equal yo your weight

Compared with 1kg block of solid iron, a 2kg block of solid iron has twice as much:

all of these

A falling object that has reached its terminal speed continues to gain:

neither

If you push an object, the object:

pushes you back

The force exerted on the tires of a car to directly accelerate it along the road is exerted by the:

road

It is simply stated as a push or a pull:

Force

A state of fall under the influence of gravity (free from air resistance) is called:

Free fall

Motion under the influence of gravitational pull only is called:

Free fall

A push on a 1kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10kg brick, one would have to push with:

10 times as much force

A 10kg brick and a 1kg brick are dropped in a vacuum. The force of gravity on the 10kg brick is:

10 times as much force on the 1kg brick

A baseball player bats a ball with a force of 1000N. The ball exerts a reaction force against the bat of:

1000N

A man weighing 200N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is:

100N

Ten seconds after starting from rest, a freely falling object (g=10m/s) will have a speed of about:

100m/s

The force of friction on a sliding object is 10N. The applied force needed to maintain a constant velocity is:

10N

The gain in speed each second for a freely falling object is about:

10m/s

A person is attracted toward the center of the Earth by a 500N gravitational force. The force of attraction of the Earth toward the person is:

500N

When a woman stands at rest with two feet on a scale, the scale reads 500N. When she gently lifts one foot, the scale reads:

500N

An object is pulled north ward with a force of 10N and south ward with a force of 15N. The magnitude of the net force on the object is:

5N

If an object is in free fall (g=10m/s2), what will be its approximate speed exactly 6 seconds later?

60m/s

A 10N falling object encounters 4N of air resistance. The magnitude of the net force on the object is:

6N

If a car increases its velocity from zero to 60 km/hr in 10 seconds, its acceleration is:

6km

A car accelerates from rest at 2m/s. What is its speed 3 seconds after the car started moving?

6m/s

The rate of change of velocity with time (in magnitude, direction, or both) is called:

Acceleration

Acceleration ids the rate of change of distance per unit time.

False

An object in motion comes to a stop without any external force:

False

The law of inertia holds true only for objects in motion, but not for those at rest.

False

The weight of a given object is the same on Earth and on the Moon.

False

The weight of an object is higher on Earth than on the Moon

False

Volume indicates how much mass an object contains.

False

When acceleration is less than "g", it is a free fall.

False

Your weight is:

The gravitational attraction between you and Earth

The attraction of a person's body toward the Earth is called weight. The reaction to this force is:

The persons body pulling on the Earth

As a ball falls, the action force is the pull of the Earth's mass on the ball. The reaction force is the:

The pull of the balls mass on Earth

In a vacuum, the acceleration of a free falling stone and feather is equal

True

In the absence of friction, no force is required to keep a horizontally moving object moving.

True

The higher the mass of an object, the higher becomes its inertia

True

The mass of a given object is the same on Earth and on the Moon.

True