29 May 6R Revision 19 P6 Forces

A ____________ is a push or a pull on an object.

• friction
• force
• magnet
• gravity

Tags

NGSS.3-PS2-1

If these teams are pulling with the same amount of force what will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed

Forces can change the ________ of a moving object.

• direction
• push
• pull
• friction

Two forces that act on an object without touching it are:

• gravity and friction

• gravity and magnetic force

• friction and magnetic force

• pushes and pulls

There is a greater frictional force between an object and a rough surface than between the same object and a smooth surface.

• True

• False

• I'm not sure

How can we reduce frictional force?

• Remove the wheels when pushing a box.

• Apply lubricant on the moving parts of a machine.

• Adding oil to a glass of water.

Which of the following statements about elastic spring force is false?

• Elastic spring force is exerted by a spring when the spring is stretched or compressed.

• When a force is applied on a spring, the spring extends or becomes longer.

• Elastic spring force allows a stretched spring to return to its original strength even if the spring is stretched beyond the limit.

Which of the following statements about gravitational force is true?

• Gravitational force only acts on us but not on plants.

• It is easier to walk down a slope as we are in the same direction as gravitational force.

• Gravitational force pulls all objects outwards to the side of the Earth.

• The weight of an object is the same as the mass of the object as gravitational force is pulling the object.

If you dropped a bowling ball and a golf ball from the top of a building, which one would hit the ground first?

• bowling ball
• baseball
• neither
• both