2.1 kinematics review

A cyclist travelling at a speed of 4.2 m s^-1 accelerates at 1.1 m s^-2. In a time of 7.4 s, the distance travelled is

• 30 m

• 35 m

• 61 m

• 91 m

Tags

NGSS.HS-PS2-1

A freely falling object on Earth has a speed of 5.0 m s^-1. After falling a further 20 m, its speed it

• 15 m s^-1

• 20 m s^-1

• 25 m s^-1

• 45 m s^-1

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A bus is travelling at a speed of 9.0 m s^-1. It then accelerates at a rate of 0.75 m s^-2 for a time of 8.0 s. What therefore is its final speed?

• 6.0 m s^-1

• 15 m s^-1

• 17 m s^-1

• 21 m s^-1

Tags

NGSS.HS-PS2-1

The acceleration of free fall on a certain planet is 8.0 m s^-2. An object gets dropped from a height and hits the ground after 1.5 s. From what height must the object have been dropped?

• 6.0 m

• 9.0 m

• 11 m

• 12 m

Tags

NGSS.HS-PS2-4

A ball is dropped from rest from a building 35.0 m high. If air resistance is neglected, then the ball will hit the ground with a speed of

• 8.4 m s^-1

• 13.1 m s^-1

• 18.5 m s^-1

• 26.2 m s^-1

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A student is asked to solve the following problem:

An object is thrown upwards with a speed of 25 m s^-1. How high will it be when the speed is 12 m s^-1 ?

Which equation will allow the problem to be solved in a SINGLE calculation?

• $s=ut+\frac{1}{2}at^2$

• $s=\frac{\left(u+v\right)t}{2}$

• $v=u+at$

• $v^2=u^2+2as$

At what point is v_y= 0 m/s?

• A

• B

• C

• D

• None of these points

At what point is v_x= 0 m/s?

• A

• B

• C

• D

• None of these points

Which vector pair (arrow pair) correctly represents the acceleration and velocity at point P?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

Who do you agree with?

• Anita: “A projectile’s v_x changes because of gravity, and its v_y remains constant.”

• Barry: “Both v_x and v_y are constant.”

• Chris: “A projectile has no acceleration in the vertical dimension but it does accelerate horizontally.”

• Dave: “A projectile has vertical acceleration and a constant horizontal velocity”