NGSS 8th Grade Review

Front

Which of the following best illustrates Newton’s Third Law of Motion?

• A car accelerates when you press the gas pedal.
• When you push a wall, the wall pushes back on you with the same force.
• A ball travels in a straight line unless acted upon by an outside force.
• The force of gravity pulls an apple to the ground.

Back

When you push a wall, the wall pushes back on you with the same force.

Front

When you jump off a boat into the water, the boat moves backward. This is an example of:

Back

Action and reaction forces

Front

A person standing on a skateboard pushes a wall. As a result, the person moves backward. This is an example of:

Back

Newton's Third Law

Front

If a person pushes a box with a force of 50 N, the box pushes back on the person with a force of:

Back

50 N

Front

When a person sits in a chair, the chair pushes up on them with an equal force. This demonstrates:

Back

Newton’s Third Law

Front

Effects of balanced forces on the motion of an object.

Back

It will stay at rest or keep moving at a constant speed.

Front

Which scenario demonstrates the effect of unbalanced forces on an object?

Back

A soccer ball being kicked and accelerating forward.

Front

When two people push in opposite directions on a box with equal force, what is the result?

Back

The box does not move.

Front

What will happen to the box when the forces acting on it are balanced?

Back

The box will not move because the forces are balanced.

Front

If a car is accelerating forward, which type of force is acting on it?

Back

Unbalanced forces