Self Check (Ch. 6)

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Self Check (Ch. 6)

Take g = 10 m s⁻². Unless otherwise specified, neglect air resistance.

1. Check all the correct statement(s) about force.

1 point

Force has both magnitude and direction.

Force must act with direct contact.

A stationary object can also exert a force on other objects.

2. Check all the fact(s) that can be explained by the Newton's first law.

1 point

A passenger in a train tends to move backwards when the train speeds up.

When someone fires a pistol, a force pushes the pistol backwards.

A rocket in space keeps moving uniformly even when the engine is turned off.

3. Check all the statement(s) that must be correct about a moving object with zero net force.

1 point

It moves with uniform velocity.

Its displacement increases uniformly.

Its acceleration is zero.

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