Newton's First Law

Imagine a place in the cosmos far from all gravitational and frictional influences. Suppose that you visit that place (just suppose) and throw a rock. The rock will

• Accelerate

• Stay Still

• Decelerate

• Gradually Stop

• Continue to move at a constant speed

A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this speed and in this direction?

• 8N

• 4N

• 0N

• -4N

• -8N

An object floating in space requires a force to set it on motion

• True

• False

A group of physics teachers are taking some time off for a little putt-putt golf. The 15th hole at the Hole-In-One Putt-Putt Golf Course has a large metal rim that putters must use to guide their ball towards the hole. Mr. S guides a golf ball around the metal rim When the ball leaves the rim, which path (1, 2, or 3) will the golf ball follow?

• 1

• 2

• 3

A Physics teacher drops a 2kg textbook (weight = 20N) out of a window in frustration. They land in a conveniently placed swimming pool and experience a constant upward force of 20N. Which diagram correctly shows the book's velocity?

• A

• B

• C

A Physics teacher drops a 2kg textbook (weight = 20N) out of a window in frustration. They land in a conveniently placed swimming pool and experience a constant upward force of 20N.

One of his keen students comments 'Once the book hits the water, the forces are balanced and the book will stop.' Are they correct?

• Yes

• No

A Physics teacher drops a 2kg textbook (weight = 20N) out of a window in frustration. They land in a conveniently placed swimming pool and experience a constant upward force of 20N.

One of his keen students comments "Upon hitting the water, the box will accelerate upwards because the water applies an upward force.". Are they correct?

• Yes

• No

A Physics teacher drops a 2kg textbook (weight = 20N) out of a window in frustration. They land in a conveniently placed swimming pool and experience a constant upward force of 20N.

One of his keen students comments "Upon hitting the water, the box will bounce upwards due to the upward force.". Are they correct?

• Yes

• No

If the forces acting upon an object are balanced, then the object

• Is not moving

• Must be moving with constant velocity

• Must not be accelerating

• Could be any of the above

• None of the above

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

• inertia
• kinetic energy
• vector
• net force