Newton's First Law

When a soccer ball is rolling along a grassy field, it does not continue moving forever. What force is acting upon it to change its state?

The amount of force needed to keep a 0.5kg baseball moving at a constant speed of 4 m/s on frictionless ice is

• 0N

• 10N

• 15N

• 25N

Two children are playing a game in which they are pulling a rope in opposite directions with an equal force of 50 N each, what will be the net force acting on the rope?

• 5N

• 10N

• depends on friction

• 0N

In a tug of war, when one team is pulling the rope with a force of 100 N and the other with 80 N, the net force would be _____.

• 100N

• 20N

• 30N

• 80N

The tendency of an object to resist a change in its motion is called _____.

• inertia

• speed

• friction

• frictionless

Without an unbalanced force acting on it, a moving object will

• change direction

• accelerate and change direction

• balance out

• keep going with constant speed in the same direction.

Unbalanced forces...

• cause change in motion and/or direction

• keep moving in one direction

• don't move

• have friction

Which of the following items would have the most inertia?

• 10 kg item

• 15 kg item

• 5 kg item

• 100 kg item