Physics Semester 1 Review

An educated scientific guess is a

• hypothesis

• theory

• law

• all of the above

A hockey puck sliding at constant velocity across the ice is

• nearly in equilibrium

• in equilibrium

• not in equilibrium

• all of the above

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A block pulled to the left with 15 N and to the right with 5 N at the same time experiences a net force of

• 20 N

• 5 N

• 15 N

• 10 N

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A sheet of paper can be quickly jerked beneath a container of milk without toppling, which best demonstrates

• the difference between force and mass

• net force

• inertia

• all of the above

If no external forces act on a moving object, it will

• continue moving at the same speed

• come to an abrupt halt

• move slower until it finally stops

• increase in speed

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When no forces act on moving objects their paths are normally

• circles

• ellipses

• straight lines

• all of the above

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The support force on a 30-kg dog sleeping on the floor is

• nonexistent while the dog is sleeping

• about 300 N

• 30 Kg

• 30 N

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When you flick a card from beneath a coin that hardly moves, you're illustrating

• supportive force

• friction

• inertia

• equilibrium

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The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

• 10 N

• 10 Kg

• 10 J

• all of the above

If you toss a coin straight upward in train that gains speed while the coin is in the air, the coin will land

• in front of you

• on you

• behind you

• will not land

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