WorksheetsFundamental Forces
Total questions: 14
Worksheet time: 20mins
The gravitational force, described systematically by Isaac Newton in the 17th century, acts between all objects having ……….; it causes apples to fall from trees and determines the orbits of the planets around the Sun.
mass
volume
The electromagnetic force, given scientific definition by James Clerk Maxwell in the 19th century, is responsible for the ………. of like and the ………. of unlike electric charges; it also explains the chemical behaviour of matter and the properties of light.
repulsion/attraction
attraction/repulsion
Gravity acts between all objects of the universe, no matter how far apart they are, and an electromagnetic wave, such as the light from a distant star, travels undiminished through space until it meets some particle that can absorb it. This means the gravitational and electromagnetic forces operate at a(n) ………. range.
finite
infinite
An electromagnetic field can be defined as a property of space caused by the ………. of an electric charge, while a gravitational field is the force field that exists in the space ………. every mass or group of masses.
motion/around
stationariness/inside
Broadly speaking, we can say a field is...
a region in which a body can experience a non-contact force.
a region in which a body can experience a contact force.
Non-contact forces act between two objects that are physically touching each other. Examples of non-contact forces include: magnetic force, electrostatic force and gravitational force.
True
False
A magnetic force is experienced by any magnetic material in a magnetic field.
Opposite magnetic poles (N – S or S – N) ………. each other. Like magnetic poles (N – N or S – S) ……… each other.
repel/attract
attract/repel
An electrostatic force is experienced by any charged particle in an electric field.
Choose the emoji that accurately represents the way unlike charges interact.
❤️
🤬
A gravitational force is experienced by any mass in a gravitational field. Masses are attracted towards each other by gravitational force. Mass is a measure of how much matter is in an object while ………. is force that acts on a mass due to gravity. It is measured in ………. whereas mass is measured in kilograms.
(a)
Contact forces are forces that act between two objects that are physically touching each other. Examples of contact forces are: reaction force, tension, friction and air resistance.
True
False
According to the Law of Action and Reaction, when one object exerts a force on a second object (action force), the second one exerts a force on the first that is equal in magnitude and ..................... in direction (reaction force.) For example, when a ball is thrown against a wall, the ball puts a force on the wall (action force), and the wall puts a force on the ball (reaction force) so the ball bounces off.
opposite
same
We talk about ………. force when an object is stretched. For example, a cable holding a ceiling lamp. And we talk about ………. forces when two objects slide past each other. For example, a box sliding down a slope.
friction/tension
tension/friction
We talk about air resistance when an object moves through the air. For example, a skydiver falling through the air. Thus we can say air resistance is a force of ………. produced when an object moves through the air.
(a)
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