Cambridge Science Grade 7 Unit Force

What are balanced and unbalanced forces?

• Balanced forces are forces that are equal in magnitude and opposite in direction, resulting in no change in motion. Unbalanced forces are forces that are not equal in magnitude and/or opposite in direction, resulting in a change in motion.

• Balanced forces are forces that are equal in magnitude and opposite in direction, resulting in a change in motion. Unbalanced forces are forces that are not equal in magnitude and/or opposite in direction, resulting in no change in motion.

• Balanced forces are forces that are not equal in magnitude and/or opposite in direction, resulting in a change in motion. Unbalanced forces are forces that are equal in magnitude and opposite in direction, resulting in no change in motion.

• Balanced forces are forces that are equal in magnitude and opposite in direction, resulting in no change in motion. Unbalanced forces are forces that are equal in magnitude and opposite in direction, resulting in a change in motion.

Define moment of force.

• The moment of force is the measure of the turning effect of a force around a point or axis.

• The moment of force is the measure of the linear effect of a force along a point or axis.

• The moment of force is the measure of the gravitational effect of a force around a point or axis.

• The moment of force is the measure of the electrical effect of a force around a point or axis.

Give an example of balanced forces.

• A person lifting a heavy object

• A ball rolling down a hill

• A car accelerating uphill

• Two people pushing a box with equal force in opposite directions.

Give an example of balanced forces.

• A person lifting a heavy object

• A ball rolling down a hill

• A car accelerating uphill

• Two people pushing a box with equal force in opposite directions.

What happens to an object when the forces acting on it are unbalanced?

• The object will experience a force in the opposite direction of the net force.

• The object will experience acceleration in the direction of the net force.

• The object will experience deceleration in the direction of the net force.

• The object will remain at rest.

How is moment of force calculated?

• The moment of force is calculated by multiplying the magnitude of the force by the perpendicular distance from the point of rotation to the line of action of the force.

• The moment of force is calculated by subtracting the magnitude of the force from the perpendicular distance from the point of rotation to the line of action of the force.

• The moment of force is calculated by adding the magnitude of the force to the perpendicular distance from the point of rotation to the line of action of the force.

• The moment of force is calculated by dividing the magnitude of the force by the perpendicular distance from the point of rotation to the line of action of the force.

Explain the concept of equilibrium in relation to balanced forces.

• Equilibrium is a state where the net force acting on an object is zero.

• Equilibrium is a state where the net force acting on an object is constantly changing.

• Equilibrium is a state where the net force acting on an object is always positive.

• Equilibrium is a state where the net force acting on an object is always negative.

What is the unit of measurement for moment of force?

• Nm

• kg

• m/s

• J

Describe the effect of unbalanced forces on the motion of an object.

• Unbalanced forces cause a change in the object's motion.

• Unbalanced forces have no effect on the motion of an object.

• Unbalanced forces cause the object to remain at rest.

• Unbalanced forces cause the object to move at a constant speed.

Describe the effect of unbalanced forces on the motion of an object.

• Unbalanced forces cause a change in the object's motion.

• Unbalanced forces have no effect on the motion of an object.

• Unbalanced forces cause the object to remain at rest.

• Unbalanced forces cause the object to move at a constant speed.