Force - friction 1

Which situation shows that frictional force is not acting on the wooden block?

• A only

• A and B only

• none

• A and C only

A force pulls the wooden block from rest.

Which diagram is correct about the directions of the motion and forces?

• (1)

• (2)

• (3)

• (4)

Which diagram shows the direction of friction correctly?

• A only

• A and B only

• none

• A, B and C

Same block slide down 4 slopes, each with different surface, P, Q, R and S.

The time taken for the block to reach the bottom are 2.0 s, 1.4 s, 0.5 s and 0.7 s respectively.

Which surface is the smoothest?

• surface P

• surface Q

• surface R

• surface S

A spring pushed a block to slide along four different surfaces.

Which surface was the roughest?

• 
• 
• 
• 

A spring pushed four different blocks to slide along the same surface.

Which block is the heaviest?

• 
• 
• 
• 

A spring used the same force to push two different blocks, X and Y, to slide along two different surfaces P and Q.

Which block is heavier and which surface is smoother?

• Block Y is heavier. Surface P is smoother.

• Block Y is heavier. Surface Q is smoother.

• Block X is heavier. Surface P is smoother.

• Block X is heavier. Surface Q is smoother.

Which is a suitable way to push the box along the floor with less force?

• place carpet along the floor

• spread glue on the floor

• place sand paper on the floor

• spread water along the floor

Which is a suitable way to push the box along the floor with less force?

• fix four legs under the box

• fix four wheels under the box

• attach a piece of rubber pad under the box

• attached a piece of cloth under the box

Which pair of shoe soles will be the most slippery?

• A

• B

• C

• D