Unit 3 Test Prep

A car is driven for 3 hours. What else do you need to know to describe this car’s speed?

• the road the car in driven on
• the time of day
• the distance the car is driven
• the number of passengers in the car

What is a force?

• a push or pull
• speed or acceleration 
• potential or kinetic energy
• balanced or unbalanced force

What is the force that causes everything to be pulled down to the Earth?

• friction
• gravity
• balanced
• unbalanced

An automobile you are riding in suddenly stops, why does your body continue to go forward?

• An object in motion stays in motion.

• Gravity pulls your body towards the earth.

• Friction makes your body slow down.

If a magician pulls a table cloth from under a table of dishes, what should happen based on Newton's 1st law?

• The dishes will stay in place on the table.

• The dishes will fall to the ground.

• The dishes will accelerate and then slow down.

Why does a rolling ball stop?

• Gravity
• Friction
• Waterfalls
• Sand

An object is moving at a constant speed. The object changes direction & continues moving at the same speed. What caused the object to change direction?

• Inertia & gravity 
• Momentum 
• Change in speed 
• An outside force acted upon it

What is an example of a balanced force?

• a person pushing a car across the road

• two people pushing a box with the same force

• a boat slowing down on a lake

The process of changing distance or position from another object

• reference point

• location

• acceleration

• motion

Velocity is both ____ and _____. 

• speed , direction 
• direction, mass
• volume, density 
• direction, magnitude