Force and Motion

If these boys 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.

How is gravity affected by mass?

• the larger the mass of the object, the greater the gravity
• small objects have no gravity
• gravity is not affected by mass of objects, whether large or small

When two children of equal weight sit at opposite ends of a seesaw, they create

• gravity
• unbalanced forces
• motion
• balanced forces

Which one is balanced?

• top
• bottom
• both

What is the effect of friction on the motion of objects?

• It speeds them up

• It slows them down

• It changes their direction

• It has no effect

Friction is a force that:

• Increases motion

• Decreases motion

• Has no effect on motion

• Changes the direction of motion

Which of the following scenarios involves friction?

• A ball rolling on a smooth floor

• A book sliding down a ramp

• A fish swimming in water

• Both A and B

1.  It is easier to ride a bicycle down a hill than to ride up a hill because _______ helps the bicycle move down the hill. 

• gravity
• friction
• rotation

If two forces act in opposite directions on an object and are not equal in magnitude, the forces are:

• Balanced

• Unbalanced

• Canceling each other out

• Adding up

The force that pulls objects toward the center of the Earth is called:

• Magnetic force

• Gravitational force

• Electric force

• Nuclear force