$$\text{Acceleration} = \frac{\text{change in velocity}}{\text{time interval}}$$

Question 1

Which of the following statements best describes the concept that 'motion is relative'?

Accepted Answer

Motion is always described as relative to something else, such as the Earth or the Sun.

Question 2

A runner completes a 400 m lap in 50 seconds. What is her average speed?

Accepted Answer

$$400 \div 50 = 8 m/s$$

Question 3

If you drive 60 km in 2 hours, what is your average speed?

Accepted Answer

$$60 \div 2 = 30 km/h$$

Question 4

Which of the following is true about instantaneous speed?

Accepted Answer

It is the speed at any given instant, as shown by a speedometer.

Question 5

Which statement correctly distinguishes velocity from speed?

Accepted Answer

Speed describes only magnitude, while velocity describes both magnitude and direction.

Question 6

A car travels at a constant speed of 60 km/h around a circular track. Which of the following is true about its velocity?

Accepted Answer

The velocity is changing because the direction is changing.

Question 7

Which of the following scenarios involves acceleration?

Accepted Answer

A car making a turn at constant speed.

Question 8

What is the correct formula for acceleration?

Accepted Answer

$$	ext{Acceleration} = \frac{	ext{change in velocity}}{	ext{time interval}}$$

Question 9

A freely falling object on Earth accelerates at approximately:

Accepted Answer

$$10 m/s$^2$$

Question 10

If an object starts from rest and falls freely for 3 seconds, what is its velocity at the end of 3 seconds? (Assume $$g = 10 m/s$^2)$$

Accepted Answer

$$30 m/s$$

Question 11

How far does a freely falling object travel in 4 seconds, starting from rest? (Assume $$g = 10 m/s$^2)$$

Accepted Answer

$$80 m$$

Question 12

A skydiver jumps from a plane and falls freely for 2 seconds before opening the parachute. What is the distance fallen? (Assume $$g = 10 m/s$^2)$$

Accepted Answer

$$40 m$$

Question 13

Which of the following best describes the units of acceleration?

Accepted Answer

Meters per second squared ($$m/s^2)$$

Question 14

A ball is dropped from a tall building. After 5 seconds, what is its velocity? (Assume $$g = 10 m/s$^2)$$

Accepted Answer

$$50 m/s$$

Question 15

A car accelerates from rest at $$2 m/s$^2$$ for $$6$$ seconds. What is its final velocity?

Accepted Answer

$$12 m/s$$

Question 16

Which of the following is a vector quantity?

Accepted Answer

Velocity

Question 17

A cyclist travels 100 m north, then 100 m south in 50 seconds. What is her average velocity?

Accepted Answer

$$0 m/s$$

Question 18

If a car's speedometer reads a constant value, which of the following must be true?

Accepted Answer

The car's speed is constant.

Question 19

A ball is thrown straight up with an initial velocity of $$20 m/s. $$How long will it take to reach its highest point? (Assume $$g = 10 m/s$^2)$$

Accepted Answer

$$2 s$$

Question 20

Which of the following is NOT necessary for an object to have constant velocity?

Accepted Answer

Changing direction

Chapter 3: Linear Motion – Study Notes

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