Circular Motion

Centripetal acceleration acts towards the ___________ of the circular motion

• centre
• circumference

What is the direction of the velocity at point B, if the ball is revolving clockwise?

• up
• right
• down
• left

What is the direction of the acceleration at point B, if the ball is revolving clockwise?

• up
• right
• down
• left

Suppose Lemming A runs off the edge of the cliff at 2 m/s and Lemming B runs off the edge at 1 m/s. Which will hit the ground farther from the base of the cliff?

• A

• B

• Both at the same distance

A rock is kicked horizontally off a cliff at a speed of 27m/s. What is the frogs speed 1 second later?

• vertical speed = -10m/s, horizontal speed = 27m/s

• vertical speed = -10m/s, horizontal speed = 17m/s

A ball rolls off a table top and strikes the floor as shown. Given the measurements made, the time the projectile spent in the air is ---.

• 17 s

• 0.34 s

• 0.58 s

• 0.49 s

A ball is thrown and follows the parabolic path shown above. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground. How do the speeds of the ball at the three points compare?

• v_P < v_Q < v_R

• v_R < v_Q < v_P

• v_Q < v_R < v_P

• v_Q < v_R = v_P

• v_P = v_Q < v_R

A ball is thrown and follows the parabolic path shown above. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground. Which of the following diagrams best shows the direction of the acceleration of the ball at point P?

• 
• 
• 
• 
• 

Which kinematic equation is most appropriate to calculate the time of flight of a projectile motion?

What happens to the centripetal force exerted on an object if you triple the velocity?

• it increases to 3X
• it decreases to 6X
• it increases to 6X
• it increases to 9X