Grade 9 Physics Quiz

What is the correct definition of a vector?

• A quantity with only direction

• A quantity with only magnitude

• A quantity with both magnitude and direction

• A quantity with neither magnitude nor direction

When adding two vectors that are perpendicular to each other, which mathematical formula should be used?

• Law of sines

• Law of cosines

• Pythagorean theorem

• Vector multiplication

What is vector resolution?

• The process of combining two vectors

• The process of breaking a vector into its x and y components

• The process of finding the angle between vectors

• The process of measuring vector magnitude

How do you find the x and y components of the resultant vector (R) when adding multiple vectors?

• Multiply all x components together and all y components together

• Divide x components by y components

• Add all x components together and all y components together

• Subtract all x components from y components

If two perpendicular vectors have magnitudes of 6 N and 8 N, what is the magnitude of their resultant vector?

• 14 N

• 10 N

• 22 N

• 48 N

When adding vectors using the tip-to-tail method, what represents the resultant vector?

• The line from the tip of the last vector to the tail of the first vector

• The line from the tail of the first vector to the tip of the last vector

• The line connecting the tips of both vectors

• The line connecting the tails of both vectors

Which method is used to find the magnitude of the resultant vector after finding its x and y components?

• Law of sines

• Vector addition

• Pythagorean theorem

• Law of cosines

When the angle between two vectors is NOT 90°, which formula(s) can be used to find the resultant?

• Only the law of sines

• Only the law of cosines

• Either the law of sines or the law of cosines

• Only the Pythagorean theorem

What is the main difference between static friction and kinetic friction?

• Static friction occurs between moving surfaces while kinetic friction occurs between stationary surfaces

• Static friction occurs between stationary surfaces while kinetic friction occurs between moving surfaces

• Static friction is always greater than kinetic friction

• Static friction and kinetic friction are the same force

In a physics problem, a 35.5 kg wooden box is pushed across a wooden floor at constant speed. If the coefficient of kinetic friction is 0.15, what force must be applied?

• 48 N

• 52 N

• 56 N

• 60 N