newton's first law year 9

Newton's first law is also called the Law of ...

• Friction

• Inertia

• Unbalanced forces

• Newtons

An object in motion tends to stay in motion unless an ___ force acts on it.

• unbalanced
• balanced

Newton's first law applies

• to both moving and nonmoving objects

• only to moving objects

• only to objects that are not moving

Because of inertia, a moving object will keep ________ unless acted on by an unbalanced force.

• at rest

• moving

• in one spot

• inertia

Because of inertia, a resting object will remain at ________.

• rest
• a constant speed
• school
• inertia 

You push on a car and it does not move.  What is true about the inertia?

• The inertia is changing
• The inertia of the car is too great 
• The inertia of the person is equal to the car
• There is not inertia because of no movement

Why is the net force 0 in the image?

• Because the elephants are the same size
• Because they are both pulling the same amount of force in opposite directions
• Because they are elephants
• Because they are pulling away from each other.

Find the net force: 15 N to the right, and another 15 N to the right.

• 0 N Right

• 0 N Left

• 30 N Left

• 30 N Right

8 N to the left , and 4 N to the right. Find the net force. Is this balanced?

• 12 N Right No

• 4 N Left No

• 12 N Right Yes

• 4 N Left Yes

You and your friend, are playing tug of war. Your friend pulls with a force of 55 N to the right. You pull with a force of 65 N to the left. What is the net force on the rope?

• 10 N, to the left

• 20 N

• 10 N, to the left

• 10 N, to the right