Forces and Energy (Year 8)

___________ are forces of equal magnitude but are opposite in direction.

• Balanced forces

• Imabalanced forces

• Momentum

• Inertia

Objects acted upon by ________ forces remain at rest or stay in motion at a constant speed.

• unbalanced

• balanced

• opposite

• strange

The force of gravity is pulling objects toward the centre of the Earth. This force is called its ______.

• drag

• friction

• weight

• thrust

A __________ is any force that occurs as a result of two objects making contact with each other.

• gravity

• unbalanced forces

• balanced forces

• contact force

______ is a measurement that refers to the amount of matter that makes up an object.

• Mass

• Weight

• Solution

• Newtons

__________ is the force that opposes the motion of a solid object over another.

• Gravity

• Friction

• Contact

• Weight

___________ are forces that are not equal in magnitude and may or may not act in the same direction.

• Balanced Forces

• Friction

• Unbalanced forces

• Thrust

___________ is the force acting on an object that is moving through air flowing in the opposite direction. The air “resists” the object's movement, slowing it down by friction that is created as the object collides with air molecules.

• Weight

• Contact

• Electrical

• Air resistance

Unbalanced forces do not cause any change in the state of motion of a body. Balanced forces may change the speed of the body or may change its direction and/or both.

• True

• False

The picture shows a toy train moving around a circular track. The locomotive contains an electric motor that drives the train. The train moves in a circle at a constant speed.
Give the letter of the arrow that shows the direction of the force that keeps the train moving in a circle.