Science Force

Question 1

What is the definition of a force?

Answer 1

A force is a push or a pull on an object.

Question 2

What can a force do to an object’s motion?

Answer 2

A force can change the speed, direction, or shape of an object.

Question 3

Fill in the blank: To move an object, it has to be ______ or ______.

Answer 3

pushed; pulled

Question 4

What must happen for a force to come into play?

Answer 4

At least two objects must interact.

Question 5

True or False: A stationary object can move without the application of a force.

Answer 5

False.

Question 6

What happens when two forces act in the same direction?

Answer 6

The forces add to one another.

Question 7

What happens when two forces act in opposite directions?

Answer 7

The net force is the difference between the two forces.

Question 8

What is the term used to describe the strength of a force?

Answer 8

Magnitude.

Question 9

What happens to the speed of an object if a force is applied in the direction of its motion?

Answer 9

The speed of the object increases.

Question 10

What happens to the speed of an object if a force is applied opposite to its motion?

Answer 10

The speed of the object decreases.

Question 11

List the effects a force can have on an object.

Answer 11

• Makes an object move from rest
• Changes the speed of a moving object
• Changes the direction of motion
• Changes the shape of an object
• Causes some or all of these effects

Question 12

What is muscular force?

Answer 12

The force resulting from the action of muscles in the body.

Question 13

What is the force of friction?

Answer 13

The force that opposes the motion of an object.

Question 14

What is a non-contact force?

Answer 14

A force that acts on an object without physical contact.

Question 15

Give an example of a non-contact force.

Answer 15

• Magnetic force
• Electrostatic force

Question 16

Fill in the blank: A force may cause an object to ______.

Answer 16

change its state of motion

Question 17

What is the net force on an object if two equal forces act in opposite directions?

Answer 17

The net force is zero.

Question 18

What happens to a ball’s motion when it strikes a ruler placed in its path?

Answer 18

The direction of motion of the ball changes.

Question 19

What is required for an object to change shape when a force is applied?

Answer 19

The object must be in contact with the force.

Question 20

True or False: An object can change its speed, direction, or shape by itself.

Answer 20

False.

Question 21

What is the definition of a non-contact force?

Answer 21

A force that can be exerted by an object without direct physical contact with another object.

Question 22

What phenomenon demonstrates that a magnet can exert force without contact?

Answer 22

A magnet can exert a force on another magnet without being in contact with it.

Question 23

What is the electrostatic force?

Answer 23

The force exerted by a charged body.

Question 24

What happens when a straw is rubbed with a sheet of paper?

Answer 24

The straw acquires an electrostatic charge.

Question 25

What is gravity?

Answer 25

An attractive force that pulls objects towards the Earth.

Question 26

What causes a coin to fall when released from a hand?

Answer 26

The force of gravity acting on the coin.

Question 27

True or False: Gravity is a property exclusive to Earth.

Answer 27

False.

Question 28

What is pressure?

Answer 28

The force acting on a unit area of a surface.

Question 29

Fill in the blank: Pressure = ______.

Answer 29

Force/Area.

Question 30

How does increasing the area of contact affect pressure when carrying heavy loads?

Answer 30

It reduces the pressure on the surface.

Question 31

What is the relationship between area and pressure?

Answer 31

Smaller area results in larger pressure for the same force.

Question 32

Do liquids exert pressure on the walls of their containers?

Answer 32

Yes.

Question 33

What is atmospheric pressure?

Answer 33

The pressure exerted by the weight of air in the atmosphere.

Question 34

What did Otto von Guericke demonstrate with his air pump?

Answer 34

The force of air pressure by using two hollow metallic hemispheres.

Question 35

How does air pressure affect an inflated balloon?

Answer 35

Air inside the balloon exerts pressure in all directions.

Question 36

What happens when you press a sucker against a surface?

Answer 36

Most air escapes, allowing atmospheric pressure to hold it in place.

Question 37

What are two types of forces discussed in the text?

Answer 37

* Non-contact forces * Contact forces.

Question 38

What is the effect of force on the state of motion of an object?

Answer 38

It can cause a change in speed or direction.

Question 39

What does the pressure exerted by air around us indicate?

Answer 39

It is known as atmospheric pressure.