Topic 4 Lesson 1 (Reference Point and forces)

Front

What is the term for the sum of all the forces acting on an object?

Back

Net force

Front

What do we call the action of pulling or pushing on an object?

Back

A push or a pull

Front

If a bus is moving at 60 miles/hour, is a passenger on the bus moving?

Back

Yes, if the reference point is someone standing outside the bus.

Front

What determines whether an object is considered to be moving?

Back

The reference point used to observe the object.

Front

What type of forces are acting when two people pull on a rope with equal strength in opposite directions?

Back

Balanced forces

Front

What is a reference point in physics?

Back

A stationary object used to determine the position of another object.

Front

What happens to the net force when all forces acting on an object are balanced?

Back

The net force is zero.

Front

What is the effect of unbalanced forces on an object?

Back

They cause the object to accelerate in the direction of the net force.

Front

If a person is sitting still in a chair, are they moving?

Back

It depends on the reference point; they are moving relative to the ground but not relative to the chair.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force of gravity acting on that mass.