Exploring Forces — Important Questions

Change in speed, Change in direction, Change in shape, Start motion from rest

Force can change speed, direction, shape of objects and can make objects move from rest. However, force cannot change the color of objects - that requires chemical or physical processes.

Magnetic force, Gravitational force, Electrostatic force

Magnetic, gravitational, and electrostatic forces can act without physical contact between objects. Muscular force and friction require physical contact to work.

They repel each other

Like charges (positive-positive or negative-negative) always repel each other, while unlike charges (positive-negative) attract each other. This is a fundamental property of electrostatic force.

Attractive

Gravitational force is always attractive. The Earth always pulls objects towards itself. Unlike magnetic or electrostatic forces, gravitational force cannot be repulsive.